using DevExpress.XtraEditors;
using DevExpress.XtraSplashScreen;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace FirstDevExpressPro
{
public partial class FrmMain : DevExpress.XtraEditors.XtraForm
{
public FrmMain()
{
InitializeComponent();

    }//加载窗体  
    private void simpleButton1\_Click(object sender, EventArgs e)  
    {  
        this.ShowWait<XtraForm1>();//通过扩展就可以直接通过this调用，XtraForm1为要打开的窗体的Name  
    }  
}

/// <summary>  
/// 通用窗体加载类  
/// </summary>  
public static class Common  
{  
    /// <summary>  
    /// 静态类中在Form前添加this表示扩展  
    /// </summary>  
    /// <typeparam name="T">泛型窗体</typeparam>  
    /// <param name="form"></param>  
    /// <param name="caption"></param>  
    /// <param name="Description"></param>  
    public static void ShowWait<T>(this Form form, String caption="加载中",string Description="请等待")  
    {  
        //设置淡入淡出效果,WaitForm1为DevXepress等待窗体控件（可以通过右键项目---》Add DevExpress Item---》New Item）  
        SplashScreenManager splash = new SplashScreenManager(form, typeof(WaitForm1), true, true);  
        splash.ShowWaitForm();//显示等待窗体  
        splash.SplashFormStartPosition = SplashFormStartPosition.CenterScreen;  
        splash.SetWaitFormCaption(caption);  
        splash.SetWaitFormDescription(Description);  
        #region 通过泛型和反射传递进来一个窗体类型  
        Type type = typeof(T);//检测类型  
        Form f = (Form)Activator.CreateInstance(type);//相当于new  
        f.Show();  
        #endregion  
        splash.CloseWaitForm();//关闭等待窗体  
    }  
}  

}

上面封装了一个窗体加载等待的方法，我们通过他来打开一个比较耗时的窗体，先打开主窗体，然后点击加载窗体：

然后开始加载窗体，如下