2.利用委托调用--最常见的办法(仅WinForm有效)
using System;
using System.Threading;
using System.Windows.Forms;
namespace ThreadTest
{
public partial class Form1 : Form
{
delegate void D(object obj);
public Form1()
{
InitializeComponent();
}
private void btnSet_Click(object sender, EventArgs e)
{
Thread t = new Thread(new ParameterizedThreadStart(SetTextBoxValue));
t.Start("Hello World");
}
void SetTextBoxValue(object obj)
{
if (textBox1.InvokeRequired)
{
D d = new D();
textBox1.Invoke(d,obj);
}
else
{
this.textBox1.Text = obj.ToString();
}
}
void DelegateSetValue(object obj)
{
this.textBox1.Text = obj.ToString();
}
}
}
3.利用SynchronizationContext上下文 -- 最神秘的方法(Winform/Silverlight能用)
之所以说它神秘,是因为msdn官方对它的解释据说也是不清不楚
using System;
using System.Threading;
using System.Windows.Forms;
namespace ThreadTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnSet_Click(object sender, EventArgs e)
{
Thread t = new Thread(new ParameterizedThreadStart(Run));
MyPram _p = new MyPram() { context = SynchronizationContext.Current, parm = "Hello World" };
t.Start(_p);
}
void Run(object obj)
{
MyPram p = obj as MyPram;
p.context.Post(SetTextValue, p.parm);
}
void SetTextValue(object obj)
{
this.textBox1.Text = obj.ToString();
}
}
public class MyPram
{
public SynchronizationContext context { set; get; }
public object parm { set; get; }
}
}
4.利用BackgroundWorker --最偷懒的办法(Winform/Silverlight通用)
BackgroundWorker会在主线程之外,另开一个后台线程,我们可以把一些处理放在后台线程中处理,完成之后,后台线程会把结果传递给主线程,同时结束自己。
using System;
using System.ComponentModel;
using System.Windows.Forms;
namespace ThreadTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnSet_Click(object sender, EventArgs e)
{
//MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString());
using (BackgroundWorker bw = new BackgroundWorker())
{
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.RunWorkerAsync("Hello World");
}
}
void bw_DoWork(object sender, DoWorkEventArgs e)
{
//MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString());
e.Result = e.Argument;//这里只是简单的把参数当做结果返回,当然您也可以在这里做复杂的处理后,再返回自己想要的结果(这里的操作是在另一个线程上完成的)
}
void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//这时后台线程已经完成,并返回了主线程,所以可以直接使用UI控件了
this.textBox1.Text = e.Result.ToString();
//MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString());
}
}
}
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