Zookeeper作为分布式的服务框架，虽然是java写的，但是强大的C#也可以连接使用。

　　C#要连接使用Zookeeper，需要借助第三方插件，而现在主要有两个插件可供使用，分别是ZooKeeperNetEx和Zookeeper.Net
　　Zookeeper.Net好像是是Apache官方提供的，但是5年没更新了，也就是说他依赖于.net framework，因此无法在.net core项目中使用

　　ZooKeeperNetEx是从java改过来的，因此里面的一些习惯是java风格的，但是好像有人在提供更新维护，支持最新的Zookeeper特性，而且摆脱了对.net framework的依赖，所以个人推荐使用ZooKeeperNetEx做开发，本文也已介绍ZooKeeperNetEx为主

新建一个控制台项目，在nuget中搜索ZooKeeperNetEx，并安装最新版

　　

　　在Program的Main方法：　　

　　

using org.apache.zookeeper;
using org.apache.zookeeper.data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace AspNetCore.ZookeeperConsole
{
class Program
{
static void Main(string[] args)
{
//Zookeeper连接字符串，采用host:port格式，多个地址之间使用逗号（,）隔开
string connectionString = "192.168.209.133:2181,192.168.209.133:2181,192.168.209.133:2181";
//会话超时时间,单位毫秒
int sessionTimeOut = 10000;
//异步监听
var watcher = new MyWatcher("ConnectWatcher");
//连接
ZooKeeper zooKeeper = new ZooKeeper(connectionString, sessionTimeOut, watcher);
Thread.Sleep(1000);//停一秒，等待连接完成
while (zooKeeper.getState() == ZooKeeper.States.CONNECTING)
{
Console.WriteLine("等待连接完成…");
Thread.Sleep(1000);
}

        var state = zooKeeper.getState();  
        if (state != ZooKeeper.States.CONNECTED && state != ZooKeeper.States.CONNECTEDREADONLY)  
        {  
            Console.WriteLine("连接失败：" + state);  
            Console.ReadKey();  
            return;  
        }

        //创建znode节点  
        {  
            var data = Encoding.UTF8.GetBytes("hello world");  
            List<ACL> acl = ZooDefs.Ids.OPEN\_ACL\_UNSAFE;//创建节点时的acl权限，也可以使用下面的自定义权限  
            //List<ACL> acl = new List<ACL>() {  
            //    new ACL((int)ZooDefs.Perms.READ, new Id("ip", "127.0.0.1")),  
            //    new ACL((int)(ZooDefs.Perms.READ | ZooDefs.Perms.WRITE), new Id("auth", "id:pass"))  
            //};  
            CreateMode createMode = CreateMode.PERSISTENT;  
            zooKeeper.createAsync("/mynode", data, acl, createMode).Wait();  
            Console.WriteLine("完成创建节点");  
        }

        //节点是否存在  
        {  
            var exists = zooKeeper.existsAsync("/mynode", new MyWatcher("ExistsWatcher")).GetAwaiter().GetResult();  
            Console.WriteLine("节点是否存在：" + exists);  
        }

        //获取节点数据  
        {  
            var dataResult = zooKeeper.getDataAsync("/mynode", new MyWatcher("GetWatcher")).GetAwaiter().GetResult();  
            var value = Encoding.UTF8.GetString(dataResult.Data);  
            Console.WriteLine("完成读取节点：" + value);  
        }

        //设置节点数据  
        {  
            var data = Encoding.UTF8.GetBytes("hello world again");  
            zooKeeper.setDataAsync("/mynode", data);  
            Console.WriteLine("设置节点数据");  
        }

        //重新获取节点数据  
        {  
            var dataResult = zooKeeper.getDataAsync("/mynode", new MyWatcher("GetWatcher")).GetAwaiter().GetResult();  
            var value = Encoding.UTF8.GetString(dataResult.Data);  
            Console.WriteLine("重新获取节点数据：" + value);  
        }

        //移除节点  
        {  
            zooKeeper.deleteAsync("/mynode").Wait();  
            Console.WriteLine("移除节点");  
        }

        Console.WriteLine("完成");  
        Console.ReadKey();  
    }  
}

class MyWatcher : Watcher  
{  
    public string Name { get; private set; }

    public MyWatcher(string name)  
    {  
        this.Name = name;  
    }

    public override Task process(WatchedEvent @event)  
    {  
        var path = @event.getPath();  
        var state = @event.getState();

        Console.WriteLine($"{Name} recieve: Path-{path}     State-{@event.getState()}    Type-{@event.get\_Type()}");  
        return Task.FromResult(0);  
    }  
}  

}

　　运行后显示结果：

　　

　 这个简单的例子是使用ZooKeeperNetEx操作的简单例子，下面具体介绍

　　ZooKeeperNetEx连接Zookeeper只需要实例化ZooKeeper对象即可　　

//Zookeeper连接字符串，采用host:port格式，多个地址之间使用逗号（,）隔开
string connectionString = "192.168.209.133:2181,192.168.209.133:2181,192.168.209.133:2181";
//会话超时时间,单位毫秒
int sessionTimeOut = 10000;
//异步监听
var watcher = new MyWatcher("ConnectWatcher");
//连接
ZooKeeper zooKeeper = new ZooKeeper(connectionString, sessionTimeOut, watcher);

　　实例化过程中至少需要三个参数

　　连接字符串(connectstring)：host:port形式，多个地址之间使用英文逗号隔开

　　会话超时时间(sessionTimeout)：当会话中，Zookeeper超过此时间未响应，则表示会话超时

　　监听器(watcher)：这个连接过程中可以注册一个监听器，当连接过程中出现状态改变时，会通知到监听器

　　ZooKeeper对象实例化过程中会异步的去连接Zookeeper，所以例子中才有一个while循环来判断状态　　

Thread.Sleep(1000);//停一秒，等待连接完成
while (zooKeeper.getState() == ZooKeeper.States.CONNECTING)
{
Console.WriteLine("等待连接完成…");
Thread.Sleep(1000);
}

　　而Zookeeper的连接状态有6种：　　

//ZooKeeper.States的枚举
CONNECTING = 0,　　//连接中
CONNECTED = 1,　　 //已连接
CONNECTEDREADONLY = 2,　　//已连接，但是只能只读访问
CLOSED = 3,　　　　//已关闭连接
AUTH_FAILED = 4,　　　　//认证失败
NOT_CONNECTED = 5　　//未连接

　　当应用连接到Zookeeper时，一般都是读取数据，所以主需要只读连接就可以满足的，不过具体还是要看需求。

　　当在指定的会话时间内未成功连接时，则会导致连接超时，因为这个过程是异步的，所以需要一个监听器来接收。

　　监听器其实是org.apache.zookeeper.Watcher的一个子类，这个需要开发者去继承实现它的process方法，比如上面的例子中我们就简单的实现

class MyWatcher : Watcher  
{  
    public string Name { get; private set; }

    public MyWatcher(string name)  
    {  
        this.Name = name;  
    }

    public override Task process(WatchedEvent @event)  
    {  
        var path = @event.getPath();  
        var state = @event.getState();

        Console.WriteLine($"{Name} recieve: Path-{path}     State-{@event.getState()}    Type-{@event.get\_Type()}");  
        return Task.FromResult(0);  
    }  
}

　　这里仅仅只是简单的输出节点路径、监听事件响应状态和监听事件类型　　

　　//监听事件响应状态，Watcher.Event.KeeperState的枚举
　　Expired = -112,　　　　//连接超时
　　Disconnected = 0,　　　　//连接断开
　　SyncConnected = 3,　　　　//已同步连接
　　AuthFailed = 4,　　　　//认证失败
　　ConnectedReadOnly = 5　　　　//只读连接　　//监听事件类型，Watcher.Event.EventType的枚举　　None = -1,　　　　//非节点操作事件
　　NodeCreated = 1,　　　　//创建节点事件
　　NodeDeleted = 2,　　　　//删除节点事件
　　NodeDataChanged = 3,　　　　//节点数据改变
　　NodeChildrenChanged = 4　　　　//子节点发生改变

　　为什么要有监听器？监听器就类似一个回调，当发生某个事件时，我们的应用可能需要进行相应的处理，如当连接断开时，由于监听器的存在，我们可以让我们的应用程序重新与Zookeeper建立连接。

　　ZooKeeperNetEx创建znode节点使用的是createAsync异步方法，传入4个参数，分别是

　　节点路径(path):：创建的节点路径

　　节点数据(data)：节点数据，它是一个字节数组，可以通过编码将字符串转化为字符数组

　　ACL权限(acl)：ACL权限，可以使用已定义好的，也可以使用自定义，如：　　

　　//已经定义好的，ZooDefs.Ids的枚举
　　OPEN_ACL_UNSAFE：完全开放
　　CREATOR_ALL_ACL：创建该znode的连接拥有所有权限
　　READ_ACL_UNSAFE：所有的客户端都可读

　　自定义方式如：　　

List<ACL> acl = new List<ACL>() {  
　　new ACL((int)ZooDefs.Perms.READ, new Id("ip", "127.0.0.1")),  
　　new ACL((int)(ZooDefs.Perms.READ | ZooDefs.Perms.WRITE), new Id("auth", "id:pass"))  
};

　　节点类型(createMode)：节点类型有4种，分别是CreateMode类的4个静态字段　　

PERSISTENT：持久化节点  
PERSISTENT\_SEQUENTIAL：持久化有序节点  
EPHEMERAL：临时节点（连接断开自动删除）  
EPHEMERAL\_SEQUENTIAL：临时有序节点（连接断开自动删除）

　　createAsync异步方法会返回实际创建的znode路径，貌似没什么用（在创建顺序节点时会用到，当一个新的znode被创建为一个顺序节点时，ZooKeeper通过将10位的序列号附加到原始名称来设置znode的路径）

　　上面这个是ZooKeeperNetEx创建znode节点的方法，而对znode的其他操作的参数就很简单了，这里就不在重述，需要具体操作才能理解，一个简单的介绍如下：　　

//删除znode节点  
public Task deleteAsync(string path, int version = -1);  
//指定的znode节点是否存在  
public Task<Stat> existsAsync(string path, Watcher watcher);  
public Task<Stat> existsAsync(string path, bool watch = false);  
//获取znode节点数据  
public Task<DataResult> getDataAsync(string path, bool watch = false);  
public Task<DataResult> getDataAsync(string path, Watcher watcher);  
//设置指定znode节点的数据  
public Task<Stat> setDataAsync(string path, byte\[\] data, int version = -1);  
//获取指定znode节点的子节点，注意，监听器是注册给当前节点的，而非子节点  
public Task<ChildrenResult> getChildrenAsync(string path, Watcher watcher);  
public Task<ChildrenResult> getChildrenAsync(string path, bool watch = false);

　　可以比较一下上一节介绍的zkCli对znode节点的操作就很容易理解了。

　　另外，需要注意的是，existsAsync方法、getDataAsync方法和getChildrenAsync方法可以在指定的znode注册一个监听器，setDataAsync方法却没有这个注册功能，这个是因为Zookeeper注册的监听器只会响应一次，当需要再次响应时，需要重新注册，这时就可以调用existsAsync方法或者getDataAsync方法或者getChildrenAsync方法进行重新注册了！

　　上一节说到ACL权限不仅可以在创建是给予，在创建后也可以修改，ZookeeperNetEx操作znode的ACL权限使用的方法如下：　　

//获取ACL权限  
public Task<ACLResult> getACLAsync(string path);  
//设置ACL权限  
public Task<Stat> setACLAsync(string path, List<ACL> acl, int aclVersion = -1);

　　说到ACL，自然就会认证存在，ZookeeperNetEx添加认证使用的是addAuthInfo方法　　

public void addAuthInfo(string scheme, byte\[\] auth);

　　其中scheme就是我们上一节介绍的那几种：　　

　　 world：默认模式，所有客户端都拥有指定的权限。world下只有一个id选项，就是anyone，通常组合写法为world:anyone:[permissons]；
　　 auth：只有经过认证的用户才拥有指定的权限。通常组合写法为auth:user:password:[permissons]，使用这种模式时，你需要先进行登录，之后采用auth模式设置权限时，user和password都将使用登录的用户名和密码；比如：
　　 digest：只有经过认证的用户才拥有指定的权限。通常组合写法为digest:user:BASE64(SHA1(password)):[permissons]，这种形式下的密码必须通过SHA1和BASE64进行双重加密；
　　 ip：限制只有特定IP的客户端才拥有指定的权限。通常组成写法为ip:182.168.0.168:[permissions]；
　　 super：代表超级管理员，拥有所有的权限，需要修改Zookeeper启动脚本进行配置。

　　auth是认证数据，如果没有则可以是空的字节数组，如：　　

//world模式认证  
zk.addAuthInfo("world",new byte\[0\]);  
//auth模式认证  
byte\[\] auth=Encoding.UTF8.GetBytes("id:pass")  
zk.addAuthInfo("auth",new byte\[0\]);  
//digest模式认证  
byte\[\] auth=Encoding.UTF8.GetBytes("加密后的字符串")  
zk.addAuthInfo("digest",new byte\[0\]);

　　ZookeeperNetEx关闭会话使用的是closeAsync方法，调用这个方法之后，当前连接对象ZooKeeper就不能再访问了

public Task closeAsync();

　　其他常用方法就不介绍了，一般时候基本上也用不上。

　　简单封装

　　真实项目中，我们连接Zookeeper多数只是为了创建znode节点，读取数据等等操作，一般不会去设置ACL等权限，甚至连认证都可能不会用到，为了更好使用ZookeeperNetEx，我做了一层简单的封装，用以满足常见的CRUD操作，同时也让它更符合我们.net开发的一些习惯。　　　

　　

using org.apache.zookeeper;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Collections.Concurrent;
using System.Threading;
using System.Text;
using org.apache.zookeeper.data;
using org.apache.utils;
using System.Diagnostics;

namespace AspNetCore.ZookeeperConsole
{

/// <summary>  
/// Zookeeper辅助类  
/// </summary>  
public class ZookeeperHelper : Watcher, IDisposable  
{  
    /// <summary>  
    /// Zookeeper路径分隔符  
    /// </summary>  
    string sep = "/";  
    /// <summary>  
    /// Zookeeper访问对象  
    /// </summary>  
    ZooKeeper zookeeper;  
    /// <summary>  
    /// Zookeeper集群地址  
    /// </summary>  
    string\[\] address;  
    /// <summary>  
    /// 路径监控节点列表  
    /// </summary>  
    ConcurrentDictionary<string, NodeWatcher> nodeWatchers = new ConcurrentDictionary<string, NodeWatcher>();  
    /// <summary>  
    /// 节点的默认权限  
    /// </summary>  
    List<ACL> defaultACL = ZooDefs.Ids.OPEN\_ACL\_UNSAFE;  
    /// <summary>  
    /// 默认的监听器  
    /// </summary>  
    DefaultWatcher defaultWatcher;  
    /// <summary>  
    /// 监控定时器  
    /// </summary>  
    System.Timers.Timer timer;  
    /// <summary>  
    /// 同步锁  
    /// </summary>  
    AutoResetEvent are = new AutoResetEvent(false);  
    /// <summary>  
    /// 是否正常关闭  
    /// </summary>  
    bool isClose = false;

    /// <summary>  
    /// 回话超时时间  
    /// </summary>  
    public int SessionTimeout { get; set; } = 10000;  
    /// <summary>  
    /// 当前路径  
    /// </summary>  
    public string CurrentPath { get; private set; }  
    /// <summary>  
    /// 是否已连接Zookeeper  
    /// </summary>  
    public bool Connected { get { return zookeeper != null && (zookeeper.getState() == ZooKeeper.States.CONNECTED || zookeeper.getState() == ZooKeeper.States.CONNECTEDREADONLY); } }  
    /// <summary>  
    /// Zookeeper是否有写的权限  
    /// </summary>  
    public bool CanWrite { get { return zookeeper != null && zookeeper.getState() == ZooKeeper.States.CONNECTED; } }  
    /// <summary>  
    /// 数据编码  
    /// </summary>  
    public Encoding Encoding { get; set; } = Encoding.Default;  
    /// <summary>  
    /// 释放时发生  
    /// </summary>  
    public event Action OnDisposing;  
    /// <summary>  
    /// 在重新连接时发生  
    /// </summary>  
    public event Action OnConnected;

    /// <summary>  
    /// 构造函数  
    /// </summary>  
    /// <param name="address">集群地址(host:prot)</param>  
    public ZookeeperHelper(params string\[\] address) : this(address, "")  
    {  
    }  
    /// <summary>  
    /// 构造函数  
    /// </summary>  
    /// <param name="address">集群地址(host:prot)</param>  
    /// <param name="root">初始化根路经</param>  
    public ZookeeperHelper(string\[\] address, string root)  
    {  
        this.address = address.ToArray();  
        CurrentPath = string.IsNullOrWhiteSpace(root) ? sep : root;

        SetLogger(new ZookeeperLogger());

        timer = new System.Timers.Timer();  
        timer.Interval = 5000;  
        timer.Elapsed += Timer\_Elapsed;  
    }

    /// <summary>  
    /// Zookeeper的日志设置  
    /// </summary>  
    /// <param name="log"></param>  
    public static void SetLogger(ZookeeperLogger log)  
    {  
        ZooKeeper.LogLevel = log.LogLevel;  
        ZooKeeper.LogToFile = log.LogToFile;  
        ZooKeeper.LogToTrace = log.LogToTrace;  
        ZooKeeper.CustomLogConsumer = log;  
    }

    #region 私有方法  
    /// <summary>  
    /// 定时器  
    /// </summary>  
    /// <param name="sender"></param>  
    /// <param name="e"></param>  
    private void Timer\_Elapsed(object sender, System.Timers.ElapsedEventArgs e)  
    {  
        timer.Enabled = false;

        if (Monitor.TryEnter(timer))//每次只能一个线程进去  
        {  
            if (!isClose)  
            {  
                //Thread.Sleep(SessionTimeout);  
                if (!Connected)  
                {  
                    try  
                    {  
                        zookeeper?.closeAsync();  
                        are.Reset();  
                        zookeeper = new ZooKeeper(string.Join(",", address), SessionTimeout, defaultWatcher);  
                        if (are.WaitOne(SessionTimeout) && Connected)//会话未超时，表示成功连接  
                        {  
                            //挂载监听器  
                            foreach (var key in nodeWatchers.Keys)  
                            {  
                                NodeWatcher watcher;  
                                if (nodeWatchers.TryGetValue(key, out watcher))  
                                {  
                                    WatchAsync(key, watcher, true).Wait();  
                                }  
                            }  
                            OnConnected?.Invoke();  
                            Monitor.Exit(timer);  
                            return;  
                        }  
                    }  
                    catch { }  
                    timer.Enabled = true;  
                }  
            }

            Monitor.Exit(timer);  
        }  
    }  
    /// <summary>  
    /// 检查连接是否正常  
    /// </summary>  
    private void CheckConnection()  
    {  
        if (!Connected)  
        {  
            throw new Exception("fail to connect to the server:" + string.Join(",", address));  
        }  
    }  
    /// <summary>  
    /// 检查是否具有写的权限  
    /// </summary>  
    private void CheckWriten()  
    {  
        if (!CanWrite)  
        {  
            throw new Exception("this connection is in readonly mode");  
        }  
    }  
    /// <summary>  
    /// 连接数据成Zookeeper的路径格式  
    /// </summary>  
    /// <param name="paths">路径</param>  
    /// <returns>连接后的路径</returns>  
    private string Combine(params string\[\] paths)  
    {  
        List<string> list = new List<string>();  
        foreach (var path in paths)  
        {  
            var ps = path.Split(new string\[\] { "/", "\\\\" }, StringSplitOptions.RemoveEmptyEntries);  
            foreach (var p in ps)  
            {  
                if (p == ".")//当前路径  
                {  
                    continue;  
                }  
                else if (p == "..")//回退  
                {  
                    if (list.Count == 0)  
                    {  
                        throw new ArgumentOutOfRangeException("path is out of range");  
                    }

                    list.RemoveAt(list.Count - 1);  
                }  
                else  
                {  
                    list.Add(p);  
                }  
            }  
        }

        return sep + string.Join(sep, list.ToArray());  
    }  
    /// <summary>  
    /// 使用指定的分隔符连接路径  
    /// </summary>  
    /// <param name="sep">分隔符</param>  
    /// <param name="paths">路径</param>  
    /// <returns>连接后的路径</returns>  
    private string MakePathName(string sep, params string\[\] paths)  
    {  
        List<string> list = new List<string>();  
        foreach (var path in paths)  
        {  
            var ps = path.Split(new string\[\] { "/", "\\\\" }, StringSplitOptions.RemoveEmptyEntries);  
            list.AddRange(ps);  
        }

        return string.Join(sep, list.ToArray());  
    }  
    /// <summary>  
    /// 获取绝对路径  
    /// </summary>  
    /// <param name="path">路径</param>  
    /// <param name="isAbsolute">路径是否是绝对路径</param>  
    /// <returns>绝对路径</returns>  
    private string GetAbsolutePath(string path, bool isAbsolute)  
    {  
        if (!isAbsolute)  
        {  
            path = Combine(CurrentPath, path);  
        }  
        else  
        {  
            path = Combine(path);  
        }  
        return path;  
    }  
    #endregion

    /// <summary>  
    /// 连接Zookeeper  
    /// </summary>  
    /// <returns>成功连接返回true,否则返回false</returns>  
    public bool Connect()  
    {  
        if (Connected)  
        {  
            return true;  
        }  
        if (zookeeper == null)  
        {  
            lock (this)  
            {  
                defaultWatcher = defaultWatcher ?? new DefaultWatcher(this, are);  
                are.Reset();  
                zookeeper = new ZooKeeper(string.Join(",", address), SessionTimeout, defaultWatcher);  
                are.WaitOne(SessionTimeout);  
            }  
        }  
        if (!Connected)  
        {  
            return false;  
        }  
        OnConnected?.Invoke();

        return true;  
    }  
    /// <summary>  
    /// 关闭连接  
    /// </summary>  
    public void Close()  
    {  
        isClose = true;  
        if (Connected)  
        {  
            zookeeper.closeAsync().Wait();  
        }

    }  
    /// <summary>  
    /// 监控回调  
    /// </summary>  
    /// <param name="event">回调事件</param>  
    /// <returns>异步</returns>  
    public async override Task process(WatchedEvent @event)  
    {  
        ZookeeperEvent ze = new ZookeeperEvent(@event);

        if (!string.IsNullOrEmpty(ze.Path))  
        {  
            NodeWatcher watcher;  
            if (nodeWatchers.TryGetValue(ze.Path, out watcher))  
            {  
                if (watcher != null)  
                {  
                    try  
                    {  
                        watcher.Process(ze);  
                    }  
                    catch { }  
                    await WatchAsync(ze.Path, watcher, true);//重新监控  
                }  
            }  
        }  
    }  
    /// <summary>  
    /// 修改当前目录地址  
    /// </summary>  
    /// <param name="path"></param>  
    public void ChangeDirectory(string path)  
    {  
        this.CurrentPath = Combine(path);  
    }  
    /// <summary>  
    /// 切换到相对目录下  
    /// </summary>  
    /// <param name="path"></param>  
    public void Goto(string path)  
    {  
        this.CurrentPath = Combine(this.CurrentPath, path);  
    }  
    /// <summary>  
    /// 使用认证  
    /// </summary>  
    /// <param name="scheme">认证类型</param>  
    /// <param name="auth">认证数据</param>  
    public void Authorize(AuthScheme scheme, string auth = "")  
    {  
        CheckConnection();  
        zookeeper.addAuthInfo(scheme.ToString().ToLower(), Encoding.GetBytes(auth));  
    }  
    #region 监听与取消  
    /// <summary>  
    /// 对当前路径添加监控  
    /// </summary>  
    /// <param name="delegate">监控</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAsync(WatcherEvent @delegate)  
    {  
        return await WatchAsync(CurrentPath, @delegate, true);  
    }  
    /// <summary>  
    /// 对当前路径添加监控  
    /// </summary>  
    /// <param name="watcher">监控</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAsync(NodeWatcher watcher)  
    {  
        return await WatchAsync(CurrentPath, watcher, true);  
    }  
    /// <summary>  
    /// 对指定路径添加监控  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="delegate">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAsync(string path, WatcherEvent @delegate, bool isAbsolutePath = false)  
    {  
        var array = await WatchManyAsync(new string\[\] { path }, @delegate, isAbsolutePath);  
        return array.FirstOrDefault();  
    }  
    /// <summary>  
    /// 对指定路径添加监控  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="watcher">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAsync(string path, NodeWatcher watcher, bool isAbsolutePath = false)  
    {  
        var array = await WatchManyAsync(new string\[\] { path }, watcher, isAbsolutePath);  
        return array.FirstOrDefault();  
    }  
    /// <summary>  
    /// 监控多个路径，但是不包括子路径  
    /// </summary>  
    /// <param name="paths">节点路径</param>  
    /// <param name="delegate">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool\[\]> WatchManyAsync(string\[\] paths, WatcherEvent @delegate, bool isAbsolutePath = false)  
    {  
        var watcher = new NodeWatcher();  
        watcher.AllTypeChanged += @delegate;  
        return await WatchManyAsync(paths, watcher, isAbsolutePath);  
    }  
    /// <summary>  
    /// 监控多个路径，但是不包括子路径  
    /// </summary>  
    /// <param name="paths">节点路径</param>  
    /// <param name="watcher">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool\[\]> WatchManyAsync(string\[\] paths, NodeWatcher watcher, bool isAbsolutePath = false)  
    {  
        CheckConnection();  
        List<bool> list = new List<bool>();  
        foreach (var path in paths)  
        {  
            try  
            {  
                var p = GetAbsolutePath(path, isAbsolutePath);  
                if (await zookeeper.existsAsync(p, this) != null)  
                {  
                    nodeWatchers\[p\] = watcher;  
                    list.Add(true);  
                }  
                else  
                {  
                    nodeWatchers.TryRemove(p, out \_);  
                    list.Add(false);  
                }  
            }  
            catch  
            {  
                list.Add(false);  
            }  
        }  
        return list.ToArray();  
    }  
    /// <summary>  
    /// 监控当前路径，包括子路径  
    /// </summary>  
    /// <param name="delegate">监控</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAllAsync(WatcherEvent @delegate)  
    {  
        return await WatchAllAsync(CurrentPath, @delegate, true);  
    }  
    /// <summary>  
    /// 监控当前路径，包括子路径  
    /// </summary>  
    /// <param name="watcher">监控</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAllAsync(NodeWatcher watcher)  
    {  
        return await WatchAllAsync(CurrentPath, watcher, true);  
    }  
    /// <summary>  
    /// 监控指定路径，包括子路径  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="delegate">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAllAsync(string path, WatcherEvent @delegate, bool isAbsolutePath = false)  
    {  
        var array = await WatchAllAsync(new string\[\] { path }, @delegate, isAbsolutePath);  
        return array.FirstOrDefault();  
    }  
    /// <summary>  
    /// 监控指定路径，包括子路径  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="watcher">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool> WatchAllAsync(string path, NodeWatcher watcher, bool isAbsolutePath = false)  
    {  
        var array = await WatchAllAsync(new string\[\] { path }, watcher, isAbsolutePath);  
        return array.FirstOrDefault();  
    }  
    /// <summary>  
    /// 监控所有路径，包括子路径  
    /// </summary>  
    /// <param name="paths">节点路径</param>  
    /// <param name="delegate">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool\[\]> WatchAllAsync(string\[\] paths, WatcherEvent @delegate, bool isAbsolutePath = false)  
    {  
        var watcher = new NodeWatcher();  
        watcher.AllTypeChanged += @delegate;  
        return await WatchAllAsync(paths, watcher, isAbsolutePath);  
    }  
    /// <summary>  
    /// 监控所有路径，包括子路径  
    /// </summary>  
    /// <param name="paths">节点路径</param>  
    /// <param name="watcher">监控</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步，true表示成功，false表示失败</returns>  
    public async Task<bool\[\]> WatchAllAsync(string\[\] paths, NodeWatcher watcher, bool isAbsolutePath = false)  
    {  
        CheckConnection();  
        List<bool> list = new List<bool>();  
        foreach (var path in paths)  
        {  
            try  
            {  
                var p = GetAbsolutePath(path, isAbsolutePath);  
                if (await zookeeper.existsAsync(p, this) != null)  
                {  
                    nodeWatchers\[p\] = watcher;  
                    list.Add(true);

                    var result = await zookeeper.getChildrenAsync(p);  
                    await WatchAllAsync(result.Children.Select(c => Combine(p, c)).ToArray(), watcher, true);  
                }  
                else  
                {  
                    nodeWatchers.TryRemove(p, out \_);  
                    list.Add(false);  
                }  
            }  
            catch  
            {  
                list.Add(false);  
            }  
        }

        return list.ToArray();  
    }  
    /// <summary>  
    /// 取消多个指定路径上的监控  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步</returns>  
    public async Task CancelAsync(string path, bool isAbsolutePath = true)  
    {  
        await CancelAsync(new string\[\] { path }, isAbsolutePath);  
    }  
    /// <summary>  
    /// 取消多个指定路径上的监控  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>异步</returns>  
    public async Task CancelAsync(string\[\] paths, bool isAbsolutePath = true)  
    {  
        foreach (var path in paths)  
        {  
            var p = GetAbsolutePath(path, isAbsolutePath);  
            nodeWatchers.TryRemove(p, out \_);  
            await Task.CompletedTask;  
        }  
    }  
    /// <summary>  
    /// 获取指定路径上的监控  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <param name="isAbsolutePath">是否绝对路径</param>  
    /// <returns>存在则返回监控对象，否则返回null</returns>  
    public NodeWatcher GetWatcher(string path, bool isAbsolutePath = true)  
    {  
        path = GetAbsolutePath(path, isAbsolutePath);  
        NodeWatcher watcher;  
        if (nodeWatchers.TryGetValue(path, out watcher))  
        {  
            return watcher;  
        }

        return null;  
    }  
    #endregion  
    #region 基本数据操作  
    /// <summary>  
    /// 当前节点是否存在  
    /// </summary>  
    /// <returns>存在返回true，否则返回false</returns>  
    public bool Exists()  
    {  
        return ExistsAsync().GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 指定节点是否存在（相对当前节点）  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <returns>存在返回true，否则返回false</returns>  
    public bool Exists(string path)  
    {  
        return ExistsAsync(path).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 指定节点是否存在  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <returns>存在返回true，否则返回false</returns>  
    public bool ExistsByAbsolutePath(string absolutePath)  
    {  
        return ExistsByAbsolutePathAsync(absolutePath).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 当前节点是否存在  
    /// </summary>  
    /// <returns>异步，存在返回true，否则返回false</returns>  
    public async Task<bool> ExistsAsync()  
    {  
        return await ExistsByAbsolutePathAsync(CurrentPath);  
    }  
    /// <summary>  
    /// 指定节点是否存在（相对当前节点）  
    /// </summary>  
    /// <param name="path">节点路径</param>  
    /// <returns>异步，存在返回true，否则返回false</returns>  
    public async Task<bool> ExistsAsync(string path)  
    {  
        path = Combine(CurrentPath, path);  
        return await ExistsByAbsolutePathAsync(path);  
    }  
    /// <summary>  
    /// 指定节点是否存在  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <returns>异步，存在返回true，否则返回false</returns>  
    public async Task<bool> ExistsByAbsolutePathAsync(string absolutePath)  
    {  
        absolutePath = Combine(absolutePath);  
        return await zookeeper.existsAsync(absolutePath, false) != null;  
    }  
    /// <summary>  
    /// 添加或者修改当前路径上的数据  
    /// </summary>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public string SetData(string value, bool persistent = false, bool sequential = false)  
    {  
        return SetDataAsync(value, persistent, sequential).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 添加或者修改指定相对路径上的数据  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public string SetData(string path, string value, bool persistent = false, bool sequential = false)  
    {  
        return SetDataAsync(path, value, persistent, sequential).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 添加或者修改指定绝对路径上的数据  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public string SetDataByAbsolutePath(string absolutePath, string value, bool persistent = false, bool sequential = false)  
    {  
        return SetDataByAbsolutePathAsync(absolutePath, value, persistent, sequential).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 添加或者修改当前路径上的数据  
    /// </summary>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public async Task<string> SetDataAsync(string value, bool persistent = false, bool sequential = false)  
    {  
        return await SetDataByAbsolutePathAsync(CurrentPath, value, persistent, sequential);  
    }  
    /// <summary>  
    /// 添加或者修改指定相对路径上的数据  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public async Task<string> SetDataAsync(string path, string value, bool persistent = false, bool sequential = false)  
    {  
        path = Combine(CurrentPath, path);  
        return await SetDataByAbsolutePathAsync(path, value, persistent, sequential);  
    }  
    /// <summary>  
    /// 添加或者修改指定绝对路径上的数据  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <param name="value">数据</param>  
    /// <param name="persistent">是否持久节点</param>  
    /// <param name="sequential">是否顺序节点</param>  
    /// <returns>znode节点名，不包含父节点路径</returns>  
    public async Task<string> SetDataByAbsolutePathAsync(string absolutePath, string value, bool persistent = false, bool sequential = false)  
    {  
        CheckConnection();  
        CheckWriten();

        absolutePath = Combine(absolutePath);  
        if (await zookeeper.existsAsync(absolutePath, false) == null)  
        {  
            absolutePath = await zookeeper.createAsync(absolutePath, Encoding.GetBytes(value), defaultACL, persistent ?  
                sequential ? CreateMode.PERSISTENT\_SEQUENTIAL : CreateMode.PERSISTENT :  
                sequential ? CreateMode.EPHEMERAL\_SEQUENTIAL : CreateMode.EPHEMERAL);  
        }  
        else  
        {  
            await zookeeper.setDataAsync(absolutePath, Encoding.GetBytes(value));  
        }  
        return absolutePath.Split(new string\[\] { sep }, StringSplitOptions.RemoveEmptyEntries).LastOrDefault();  
    }  
    /// <summary>  
    /// 获取指定相对路径上的数据  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    /// <returns>相对路径上的数据</returns>  
    public string GetData(string path)  
    {  
        return GetDataAsync(path).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 获取指定绝对路径上的数据  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <returns>相对路径上的数据</returns>  
    public string GetDataByAbsolutePath(string absolutePath)  
    {  
        return GetDataByAbsolutePathAsync(absolutePath).GetAwaiter().GetResult();  
    }  
    /// <summary>  
    /// 获取指定相对路径上的数据  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    /// <returns>相对路径上的数据</returns>  
    public async Task<string> GetDataAsync(string path)  
    {  
        path = Combine(CurrentPath, path);  
        return await GetDataByAbsolutePathAsync(path);  
    }  
    /// <summary>  
    /// 获取指定绝对路径上的数据  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <returns>绝对路径上的数据</returns>  
    public async Task<string> GetDataByAbsolutePathAsync(string absolutePath)  
    {  
        CheckConnection();  
        absolutePath = Combine(absolutePath);  
        if (await zookeeper.existsAsync(absolutePath, false) == null)  
        {  
            return "";  
        }  
        var data = await zookeeper.getDataAsync(absolutePath, false);  
        return Encoding.GetString(data.Data);  
    }  
    /// <summary>  
    /// 获取指定节点及其字节点的所有值，使用路径做键返回字典型  
    /// </summary>  
    /// <param name="sep"></param>  
    /// <returns></returns>  
    public async Task<IDictionary<string, string>> GetDictionaryAsync(string sep = ":")  
    {  
        CheckConnection();  
        Dictionary<string, string> dict = new Dictionary<string, string>();  
        async Task action(string path)  
        {  
            try  
            {  
                var result = await zookeeper.getChildrenAsync(path, false);  
                string name = MakePathName(sep, path);  
                dict\[name\] = await GetDataByAbsolutePathAsync(path);  
                foreach (var child in result.Children)  
                {  
                    var p = Combine(path, child);  
                    await action(p);  
                }  
            }  
            catch (Exception ex)  
            {

            }  
        }

        await action(CurrentPath);  
        return dict;  
    }

    /// <summary>  
    /// 获取子节点  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    /// <param name="order">是否按时间排序</param>  
    /// <returns>子节点数组（节点路径不含父节点路径）</returns>  
    public async Task<string\[\]> GetChildrenAsync(string path, bool order = false)  
    {  
        path = Combine(CurrentPath, path);  
        return await GetChildrenByAbsolutePathAsync(path, order);  
    }  
    /// <summary>  
    /// 获取指定路径绝对路径下的子节点  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    /// <param name="order">是否按时间排序</param>  
    /// <returns>子节点数组（节点路径不含父节点路径）</returns>  
    public async Task<string\[\]> GetChildrenByAbsolutePathAsync(string absolutePath, bool order = false)  
    {  
        var result = await zookeeper.getChildrenAsync(absolutePath, false);  
        if (!order)  
        {  
            return result.Children.ToArray();  
        }

        List<(string, long)> list = new List<(string, long)>();  
        foreach (var child in result.Children)  
        {  
            var p = Combine(absolutePath, child);  
            var stat = await zookeeper.existsAsync(p, false);  
            if (stat != null)  
            {  
                list.Add((child, stat.getCtime()));  
            }  
        }

        return list.OrderBy(l => l.Item2).Select(l => l.Item1).ToArray();  
    }  
    /// <summary>  
    /// 移除当前路径节点  
    /// </summary>  
    public void Delete()  
    {  
        DeleteAsync().Wait();  
    }  
    /// <summary>  
    /// 移除相对当前的指定路径节点及子节点  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    public void Delete(string path)  
    {  
        DeleteAsync(path).Wait();  
    }  
    /// <summary>  
    /// 移除指定绝对路径节点及子节点  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    public void DeleteByAbsolutePath(string absolutePath)  
    {  
        DeleteByAbsolutePathAsync(absolutePath).Wait();  
    }  
    /// <summary>  
    /// 移除当前路径节点  
    /// </summary>  
    public async Task DeleteAsync()  
    {  
        await DeleteByAbsolutePathAsync(CurrentPath);  
    }  
    /// <summary>  
    /// 移除相对当前的指定路径节点及子节点  
    /// </summary>  
    /// <param name="path">相对路径</param>  
    public async Task DeleteAsync(string path)  
    {  
        path = Combine(CurrentPath, path);  
        await DeleteByAbsolutePathAsync(path);  
    }  
    /// <summary>  
    /// 移除指定绝对路径节点及子节点  
    /// </summary>  
    /// <param name="absolutePath">绝对路径</param>  
    public async Task DeleteByAbsolutePathAsync(string absolutePath)  
    {  
        if (await ExistsByAbsolutePathAsync(absolutePath))  
        {  
            var children = await GetChildrenByAbsolutePathAsync(absolutePath);  
            foreach (var child in children)  
            {  
                var path = Combine(absolutePath, child);  
                await DeleteByAbsolutePathAsync(path);  
            }

            absolutePath = Combine(absolutePath);  
            await zookeeper.deleteAsync(absolutePath);  
        }  
    }  
    #endregion  
    /// <summary>  
    /// 释放资源  
    /// </summary>  
    public void Dispose()  
    {  
        OnDisposing?.Invoke();  
        Close();  
        timer?.Dispose();  
        nodeWatchers?.Clear();  
        are?.Dispose();  
        GC.Collect();  
    }

    /// <summary>  
    /// 默认的监听器，用于初始化使用  
    /// </summary>  
    public class DefaultWatcher : Watcher  
    {  
        /// <summary>  
        /// waithandle同步  
        /// </summary>  
        EventWaitHandle ewh;  
        /// <summary>  
        /// 辅助类  
        /// </summary>  
        ZookeeperHelper zookeeperHelper;

        public DefaultWatcher(ZookeeperHelper zookeeperHelper, EventWaitHandle ewh)  
        {  
            this.ewh = ewh;  
            this.zookeeperHelper = zookeeperHelper;  
        }  
        /// <summary>  
        /// 回调  
        /// </summary>  
        /// <param name="event">监听事件对象</param>  
        /// <returns></returns>  
        public override Task process(WatchedEvent @event)  
        {  
            var state = @event.getState();  
            if (state == Event.KeeperState.ConnectedReadOnly || state == Event.KeeperState.SyncConnected)//连接时  
            {  
                ewh.Set();  
            }  
            else if ((state == Event.KeeperState.Expired) && !zookeeperHelper.isClose)//回话过期重新建立连接  
            {  
                zookeeperHelper.timer.Enabled = true;  
            }

            return Task.FromResult(1);  
        }  
    }  
}  
/// <summary>  
/// 认证类型  
/// </summary>  
public enum AuthScheme  
{  
    /// <summary>  
    /// 下面只有一个id，叫anyone，world:anyone代表任何人，zookeeper中对所有人有权限的结点就是属于world:anyone类型的。创建节点的默认权限。有唯一的id是anyone授权的时候的模式为 world:anyone:rwadc 表示所有人都对这个节点有rwadc的权限  
    /// </summary>  
    World = 0,  
    /// <summary>  
    ///不需要id,只要是通过authentication的user都有权限（zookeeper支持通过kerberos来进行authencation, 也支持username/password形式的authentication)  
    /// </summary>  
    Auth = 1,  
    /// <summary>  
    /// 它对应的id为username:BASE64(SHA1(password))，它需要先通过加密过的username:password形式的authentication。  
    /// </summary>  
    Digest = 2,  
    /// <summary>  
    ///它对应的id为客户机的IP地址，设置的时候可以设置一个ip段，比如ip:192.168.1.0/16。  
    /// </summary>  
    Ip = 3,  
    /// <summary>  
    /// 在这种scheme情况下，对应的id拥有超级权限，可以做任何事情(cdrwa）  
    /// </summary>  
    Super = 4  
}  
/// <summary>  
/// Zookeeper事件数据  
/// </summary>  
public class ZookeeperEvent  
{  
    public ZookeeperEvent(WatchedEvent @event)  
    {  
        switch (@event.getState())  
        {  
            case Watcher.Event.KeeperState.AuthFailed: State = EventState.AuthFailed; break;  
            case Watcher.Event.KeeperState.ConnectedReadOnly: State = EventState.ConnectedReadOnly; break;  
            case Watcher.Event.KeeperState.Disconnected: State = EventState.Disconnected; break;  
            case Watcher.Event.KeeperState.Expired: State = EventState.Expired; break;  
            case Watcher.Event.KeeperState.SyncConnected: State = EventState.SyncConnected; break;  
        }

        switch (@event.get\_Type())  
        {  
            case Watcher.Event.EventType.NodeChildrenChanged: Type = EventType.NodeChildrenChanged; break;  
            case Watcher.Event.EventType.NodeCreated: Type = EventType.NodeCreated; break;  
            case Watcher.Event.EventType.NodeDataChanged: Type = EventType.NodeDataChanged; break;  
            case Watcher.Event.EventType.NodeDeleted: Type = EventType.NodeDeleted; break;  
            case Watcher.Event.EventType.None: Type = EventType.None; break;  
        }

        Path = @event.getPath();  
    }  
    /// <summary>  
    /// 当前连接状态  
    /// </summary>  
    public EventState State { get; private set; }  
    /// <summary>  
    /// 事件类型  
    /// </summary>  
    public EventType Type { get; private set; }  
    /// <summary>  
    /// 事件路径  
    /// </summary>  
    public string Path { get; private set; }

    /// <summary>  
    /// 连接状态  
    /// </summary>  
    public enum EventState  
    {/// <summary>  
     /// 超时  
     /// </summary>  
        Expired = -112,  
        /// <summary>  
        /// 连接已断开  
        /// </summary>  
        Disconnected = 0,  
        /// <summary>  
        /// 已建立连接  
        /// </summary>  
        SyncConnected = 3,  
        /// <summary>  
        /// 认证失败  
        /// </summary>  
        AuthFailed = 4,  
        /// <summary>  
        /// 已建立连接，但是只支持只读模式  
        /// </summary>  
        ConnectedReadOnly = 5  
    }  
    /// <summary>  
    /// 时间类型  
    /// </summary>  
    public enum EventType  
    {  
        /// <summary>  
        /// 空类型，如：建立连接时  
        /// </summary>  
        None = -1,  
        /// <summary>  
        /// 节点创建时  
        /// </summary>  
        NodeCreated = 1,  
        /// <summary>  
        /// 节点删除时  
        /// </summary>  
        NodeDeleted = 2,  
        /// <summary>  
        /// 节点数据改变时  
        /// </summary>  
        NodeDataChanged = 3,  
        /// <summary>  
        /// 节点增加子节点时  
        /// </summary>  
        NodeChildrenChanged = 4  
    }  
}  
/// <summary>  
/// 监控对象  
/// </summary>  
public class NodeWatcher  
{  
    /// <summary>  
    /// 节点创建时调用事件  
    /// </summary>  
    public event WatcherEvent NodeCreated;  
    /// <summary>  
    /// 节点删除时调用事件  
    /// </summary>  
    public event WatcherEvent NodeDeleted;  
    /// <summary>  
    /// 节点数据改变时调用事件  
    /// </summary>  
    public event WatcherEvent NodeDataChanged;  
    /// <summary>  
    /// 节点增加子节点时调用事件  
    /// </summary>  
    public event WatcherEvent NodeChildrenChanged;  
    /// <summary>  
    /// 不区分类型，所有的类型都会调用  
    /// </summary>  
    public event WatcherEvent AllTypeChanged;

    /// <summary>  
    /// 触发，执行事件  
    /// </summary>  
    /// <param name="event"></param>  
    public void Process(ZookeeperEvent @event)  
    {  
        try  
        {  
            switch (@event.Type)  
            {  
                case ZookeeperEvent.EventType.NodeChildrenChanged:  
                    NodeChildrenChanged?.Invoke(@event);  
                    break;  
                case ZookeeperEvent.EventType.NodeCreated:  
                    NodeCreated?.Invoke(@event);  
                    break;  
                case ZookeeperEvent.EventType.NodeDeleted:  
                    NodeDeleted?.Invoke(@event);  
                    break;  
                case ZookeeperEvent.EventType.NodeDataChanged:  
                    NodeDataChanged?.Invoke(@event);  
                    break;  
            }

            AllTypeChanged?.Invoke(@event);  
        }  
        catch { }  
    }  
}  
/// <summary>  
/// 监控事件委托  
/// </summary>  
/// <param name="event"></param>  
public delegate void WatcherEvent(ZookeeperEvent @event);  
/// <summary>  
/// Zookeeper默认日志记录  
/// </summary>  
public class ZookeeperLogger : ILogConsumer  
{  
    /// <summary>  
    /// 是否记录日志到文件  
    /// </summary>  
    public bool LogToFile { get; set; } = false;  
    /// <summary>  
    /// 是否记录堆栈信息  
    /// </summary>  
    public bool LogToTrace { get; set; } = true;  
    /// <summary>  
    /// 日志级别  
    /// </summary>  
    public TraceLevel LogLevel { get; set; } = TraceLevel.Warning;

    /// <summary>  
    /// 日志记录  
    /// </summary>  
    /// <param name="severity"></param>  
    /// <param name="className"></param>  
    /// <param name="message"></param>  
    /// <param name="exception"></param>  
    public virtual void Log(TraceLevel severity, string className, string message, Exception exception)  
    {  
        Console.WriteLine(string.Format("Level:{0}  className:{1}   message:{2}", severity, className, message));  
        Console.WriteLine(exception.StackTrace);  
    }  
}  

}

ZookeeperHelper

　　简单的使用例子：　　

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace AspNetCore.ZookeeperConsole
{
class Program
{
static void Main(string[] args)
{
//Zookeeper连接字符串，采用host:port格式，多个地址之间使用逗号（,）隔开
string[] address = new string[] { "192.168.209.133:2181", "192.168.209.133:2181", "192.168.209.133:2181" };
//会话超时时间,单位毫秒
int sessionTimeOut = 10000;

        ZookeeperHelper zookeeperHelper = new ZookeeperHelper(address, "/");  
        zookeeperHelper.SessionTimeout = sessionTimeOut;  
        zookeeperHelper.Connect();//发起连接  
        while (!zookeeperHelper.Connected)  
        {  
            Thread.Sleep(1000); //停一秒，等待连接完成  
        }

        //创建znode节点  
        {  
            zookeeperHelper.SetData("/mynode", "hello world", true, false);  
            Console.WriteLine("完成创建节点");  
        }

        //节点是否存在  
        {  
            var exists = zookeeperHelper.Exists("/mynode");  
            Console.WriteLine("节点是否存在：" + exists);  
        }

        //添加监听器  
        {  
            zookeeperHelper.WatchAsync("/mynode", (e) =>  
            {  
                Console.WriteLine($"recieve: Path-{e.Path}     State-{e.State}    Type-{e.Type}");  
            }).Wait();  
        }

        //获取节点数据  
        {  
            var value = zookeeperHelper.GetData("/mynode");  
            Console.WriteLine("完成读取节点：" + value);  
        }

        //设置节点数据  
        {  
            zookeeperHelper.SetData("/mynode", "hello world again");  
            Console.WriteLine("设置节点数据");  
        }

        //重新获取节点数据  
        {  
            var value = zookeeperHelper.GetData("/mynode");  
            Console.WriteLine("重新获取节点数据：" + value);  
        }

        //移除节点  
        {  
            zookeeperHelper.Delete("/mynode");  
            Console.WriteLine("移除节点");  
        }

        Console.WriteLine("完成");  
        Console.ReadKey();

    }  
}  

}

　　执行结果：