C#自动切换Windows窗口程序，如何才能调出主窗口？

 namespace AutoChangeWindow

 {

     partial class Form1

     {

         /// <summary>

         /// 必需的设计器变量。

         /// </summary>

         private System.ComponentModel.IContainer components = null;

         /// <summary>

         /// 清理所有正在使用的资源。

         /// </summary>

         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

         protected override void Dispose(bool disposing)

         {

             if (disposing && (components != null))

             {

                 components.Dispose();

             }

             base.Dispose(disposing);

         }

         #region Windows 窗体设计器生成的代码

         /// <summary>

         /// 设计器支持所需的方法 - 不要

         /// 使用代码编辑器修改此方法的内容。

         /// </summary>

         private void InitializeComponent()

         {

             this.btnGetProcessList = new System.Windows.Forms.Button();

             this.btnStart = new System.Windows.Forms.Button();

             this.txtWin1 = new System.Windows.Forms.TextBox();

             this.label1 = new System.Windows.Forms.Label();

             this.label2 = new System.Windows.Forms.Label();

             this.txtWin2 = new System.Windows.Forms.TextBox();

             this.txtWin3 = new System.Windows.Forms.TextBox();

             this.label3 = new System.Windows.Forms.Label();

             this.label4 = new System.Windows.Forms.Label();

             this.btnStop = new System.Windows.Forms.Button();

             this.label5 = new System.Windows.Forms.Label();

             this.label6 = new System.Windows.Forms.Label();

             this.label7 = new System.Windows.Forms.Label();

             this.txtSpan1 = new System.Windows.Forms.TextBox();

             this.txtSpan2 = new System.Windows.Forms.TextBox();

             this.txtSpan3 = new System.Windows.Forms.TextBox();

             this.label8 = new System.Windows.Forms.Label();

             this.label9 = new System.Windows.Forms.Label();

             this.label10 = new System.Windows.Forms.Label();

             this.SuspendLayout();

             //

             // btnGetProcessList

             //

             this.btnGetProcessList.Location = new System.Drawing.Point(-, -);

             this.btnGetProcessList.Name = "btnGetProcessList";

             this.btnGetProcessList.Size = new System.Drawing.Size(, );

             this.btnGetProcessList.TabIndex = ;

             this.btnGetProcessList.Text = "获取进程列表";

             this.btnGetProcessList.UseVisualStyleBackColor = true;

             //

             // btnStart

             //

             this.btnStart.Location = new System.Drawing.Point(, );

             this.btnStart.Name = "btnStart";

             this.btnStart.Size = new System.Drawing.Size(, );

             this.btnStart.TabIndex = ;

             this.btnStart.Text = "启动";

             this.btnStart.UseVisualStyleBackColor = true;

             this.btnStart.Click += new System.EventHandler(this.btnStart_Click);

             //

             // txtWin1

             //

             this.txtWin1.Location = new System.Drawing.Point(, );

             this.txtWin1.Name = "txtWin1";

             this.txtWin1.Size = new System.Drawing.Size(, );

             this.txtWin1.TabIndex = ;

             //

             // label1

             //

             this.label1.AutoSize = true;

             this.label1.Location = new System.Drawing.Point(, );

             this.label1.Name = "label1";

             this.label1.Size = new System.Drawing.Size(, );

             this.label1.TabIndex = ;

             this.label1.Text = "窗口1：";

             //

             // label2

             //

             this.label2.AutoSize = true;

             this.label2.Location = new System.Drawing.Point(, );

             this.label2.Name = "label2";

             this.label2.Size = new System.Drawing.Size(, );

             this.label2.TabIndex = ;

             this.label2.Text = "窗口2：";

             //

             // txtWin2

             //

             this.txtWin2.Location = new System.Drawing.Point(, );

             this.txtWin2.Name = "txtWin2";

             this.txtWin2.Size = new System.Drawing.Size(, );

             this.txtWin2.TabIndex = ;

             //

             // txtWin3

             //

             this.txtWin3.Location = new System.Drawing.Point(, );

             this.txtWin3.Name = "txtWin3";

             this.txtWin3.Size = new System.Drawing.Size(, );

             this.txtWin3.TabIndex = ;

             //

             // label3

             //

             this.label3.AutoSize = true;

             this.label3.Location = new System.Drawing.Point(, );

             this.label3.Name = "label3";

             this.label3.Size = new System.Drawing.Size(, );

             this.label3.TabIndex = ;

             this.label3.Text = "窗口3：";

             //

             // label4

             //

             this.label4.AutoSize = true;

             this.label4.Location = new System.Drawing.Point(, );

             this.label4.Name = "label4";

             this.label4.Size = new System.Drawing.Size(, );

             this.label4.TabIndex = ;

             this.label4.Text = "填写窗口名称";

             //

             // btnStop

             //

             this.btnStop.Location = new System.Drawing.Point(, );

             this.btnStop.Name = "btnStop";

             this.btnStop.Size = new System.Drawing.Size(, );

             this.btnStop.TabIndex = ;

             this.btnStop.Text = "停止";

             this.btnStop.UseVisualStyleBackColor = true;

             this.btnStop.Click += new System.EventHandler(this.btnStop_Click);

             //

             // label5

             //

             this.label5.AutoSize = true;

             this.label5.Location = new System.Drawing.Point(, );

             this.label5.Name = "label5";

             this.label5.Size = new System.Drawing.Size(, );

             this.label5.TabIndex = ;

             this.label5.Text = "间隔";

             //

             // label6

             //

             this.label6.AutoSize = true;

             this.label6.Location = new System.Drawing.Point(, );

             this.label6.Name = "label6";

             this.label6.Size = new System.Drawing.Size(, );

             this.label6.TabIndex = ;

             this.label6.Text = "间隔";

             //

             // label7

             //

             this.label7.AutoSize = true;

             this.label7.Location = new System.Drawing.Point(, );

             this.label7.Name = "label7";

             this.label7.Size = new System.Drawing.Size(, );

             this.label7.TabIndex = ;

             this.label7.Text = "间隔";

             //

             // txtSpan1

             //

             this.txtSpan1.Location = new System.Drawing.Point(, );

             this.txtSpan1.Name = "txtSpan1";

             this.txtSpan1.Size = new System.Drawing.Size(, );

             this.txtSpan1.TabIndex = ;

             //

             // txtSpan2

             //

             this.txtSpan2.Location = new System.Drawing.Point(, );

             this.txtSpan2.Name = "txtSpan2";

             this.txtSpan2.Size = new System.Drawing.Size(, );

             this.txtSpan2.TabIndex = ;

             //

             // txtSpan3

             //

             this.txtSpan3.Location = new System.Drawing.Point(, );

             this.txtSpan3.Name = "txtSpan3";

             this.txtSpan3.Size = new System.Drawing.Size(, );

             this.txtSpan3.TabIndex = ;

             //

             // label8

             //

             this.label8.AutoSize = true;

             this.label8.Location = new System.Drawing.Point(, );

             this.label8.Name = "label8";

             this.label8.Size = new System.Drawing.Size(, );

             this.label8.TabIndex = ;

             this.label8.Text = "秒";

             //

             // label9

             //

             this.label9.AutoSize = true;

             this.label9.Location = new System.Drawing.Point(, );

             this.label9.Name = "label9";

             this.label9.Size = new System.Drawing.Size(, );

             this.label9.TabIndex = ;

             this.label9.Text = "秒";

             //

             // label10

             //

             this.label10.AutoSize = true;

             this.label10.Location = new System.Drawing.Point(, );

             this.label10.Name = "label10";

             this.label10.Size = new System.Drawing.Size(, );

             this.label10.TabIndex = ;

             this.label10.Text = "秒";

             //

             // Form1

             //

             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

             this.ClientSize = new System.Drawing.Size(, );

             this.Controls.Add(this.label10);

             this.Controls.Add(this.label9);

             this.Controls.Add(this.label8);

             this.Controls.Add(this.txtSpan3);

             this.Controls.Add(this.txtSpan2);

             this.Controls.Add(this.txtSpan1);

             this.Controls.Add(this.label7);

             this.Controls.Add(this.label6);

             this.Controls.Add(this.label5);

             this.Controls.Add(this.btnStop);

             this.Controls.Add(this.label4);

             this.Controls.Add(this.txtWin3);

             this.Controls.Add(this.label3);

             this.Controls.Add(this.txtWin2);

             this.Controls.Add(this.label2);

             this.Controls.Add(this.label1);

             this.Controls.Add(this.txtWin1);

             this.Controls.Add(this.btnStart);

             this.Controls.Add(this.btnGetProcessList);

             this.Name = "Form1";

             this.Text = "窗口自动切换";

             this.Load += new System.EventHandler(this.Form1_Load);

             this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);

             this.ResumeLayout(false);

             this.PerformLayout();

         }

         #endregion

         private System.Windows.Forms.Button btnGetProcessList;

         private System.Windows.Forms.Button btnStart;

         private System.Windows.Forms.TextBox txtWin1;

         private System.Windows.Forms.Label label1;

         private System.Windows.Forms.Label label2;

         private System.Windows.Forms.TextBox txtWin2;

         private System.Windows.Forms.TextBox txtWin3;

         private System.Windows.Forms.Label label3;

         private System.Windows.Forms.Label label4;

         private System.Windows.Forms.Button btnStop;

         private System.Windows.Forms.Label label5;

         private System.Windows.Forms.Label label6;

         private System.Windows.Forms.Label label7;

         private System.Windows.Forms.TextBox txtSpan1;

         private System.Windows.Forms.TextBox txtSpan2;

         private System.Windows.Forms.TextBox txtSpan3;

         private System.Windows.Forms.Label label8;

         private System.Windows.Forms.Label label9;

         private System.Windows.Forms.Label label10;

     }

 }

 using System;

 using System.Windows.Forms;

 using System.Diagnostics;

 using System.Runtime.InteropServices;

 using System.Threading;

 namespace AutoChangeWindow

 {

     public partial class Form1 : Form

     {

         public Form1()

         {

             InitializeComponent();

             this.txtWin1.Text = "计算器";

             this.txtWin2.Text = "无标题 - 记事本";

             this.txtWin3.Text = "窗口自动切换";

             this.txtSpan1.Text = this.txtSpan2.Text = this.txtSpan3.Text = "";

         }

         #region API

         [DllImport("user32.dll")]

         private static extern bool SetForegroundWindow(IntPtr hWnd);

         [DllImport("user32.dll")]

         private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

         [DllImport("user32.dll")]

         private static extern IntPtr GetForegroundWindow();

         [DllImport("kernel32.dll")]

         private static extern double GetCurrentThreadId();

         [DllImport("user32.dll")]

         private static extern double GetWindowThreadProcessId(IntPtr hWnd, string lpdwProcessId);

         [DllImport("user32.dll")]

         private static extern bool AttachThreadInput(double idAttach, double idAttachTo, bool fAttach);

         [DllImport("user32.dll", EntryPoint = "ShowWindow", SetLastError = true)]

         static extern bool ShowWindow(IntPtr hWnd, uint nCmdShow);

         [DllImport("user32.dll", EntryPoint = "SetWindowPos")]

         static extern bool SetWindowPos(

         IntPtr hWnd,

         IntPtr hWndInsertAfter,

         int X,

         int Y,

         int cx,

         int cy,

         uint uFlags

         );

         static readonly IntPtr HWND_TOPMOST = new IntPtr(-);

         static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-);

         static readonly IntPtr HWND_TOP = new IntPtr();

         const UInt32 SWP_NOSIZE = 0x0001;

         const UInt32 SWP_NOMOVE = 0x0002;

         const UInt32 SWP_NOZORDER = 0x0004;

         const UInt32 SWP_NOREDRAW = 0x0008;

         const UInt32 SWP_NOACTIVATE = 0x0010;

         const UInt32 SWP_FRAMECHANGED = 0x0020;

         const UInt32 SWP_SHOWWINDOW = 0x0040;

         const UInt32 SWP_HIDEWINDOW = 0x0080;

         const UInt32 SWP_NOCOPYBITS = 0x0100;

         const UInt32 SWP_NOOWNERZORDER = 0x0200;

         const UInt32 SWP_NOSENDCHANGING = 0x0400;

         const UInt32 TOPMOST_FLAGS = SWP_NOMOVE | SWP_NOSIZE;

         const UInt32 SW_HIDE = ;             // ' {隐藏}Private Const SW_ShowNormal = 1         ' {用最近的大小和位置显示, 激活}/

         const UInt32 SW_NORMAL = ;          // ' {同 SW_ShowNORMAL}Private Const SW_ShowMinimized = 2      ' {最小化, 激活}

         const UInt32 SW_ShowMaximized = ;    // ' {最大化, 激活}Private Const SW_Maximize = 3           ' {同 SW_ShowMaximized}

         const UInt32 SW_ShowNOACTIVATE = ;   // ' {用最近的大小和位置显示, 不激活}Private Const SW_Show = 5               ' {同 SW_ShowNORMAL}

         const UInt32 SW_Minimize = ;       // ' {最小化, 不激活}Private Const SW_ShowMinNOACTIVE = 7    ' {同 SW_Minimize}

         const UInt32 SW_ShowNA = ;          // ' {同 SW_ShowNOACTIVATE}Private Const SW_RESTORE = 9            ' {同 SW_ShowNORMAL}

         const UInt32 SW_ShowDEFAULT = ;    // ' {同 SW_ShowNORMAL}Private Const SW_Max = 10               ' {同 SW_ShowNORMAL}

         #endregion

         private void Form1_Load(object sender, EventArgs e)

         {

         }

         int n = ;

         protected void ExecChangeWindow()

         {

             do

             {

                 IntPtr hWnd = FindWindow(null, "计算器");

                 double dwForeID;

                 double dwCurID;

                 IntPtr hForeWnd = GetForegroundWindow();

                 dwCurID = GetCurrentThreadId();

                 dwForeID = GetWindowThreadProcessId(hForeWnd, null);

                 AttachThreadInput(dwCurID, dwForeID, true);

                 ShowWindow(hWnd, SW_ShowMaximized);

                 SetWindowPos(hWnd, HWND_TOPMOST, , , , , SWP_NOSIZE | SWP_NOMOVE);

                 SetWindowPos(hWnd, HWND_NOTOPMOST, , , , , SWP_NOSIZE | SWP_NOMOVE);

                 SetForegroundWindow(hWnd);

                 AttachThreadInput(dwCurID, dwForeID, false);

                 int span1 = int.Parse("");

                 Thread.Sleep(span1 * );

                 hWnd = FindWindow(null, "无标题 - 记事本");

                 hForeWnd = GetForegroundWindow();

                 dwCurID = GetCurrentThreadId();

                 dwForeID = GetWindowThreadProcessId(hForeWnd, null);

                 AttachThreadInput(dwCurID, dwForeID, true);

                 ShowWindow(hWnd, SW_ShowMaximized);

                 SetWindowPos(hWnd, HWND_TOPMOST, , , , , SWP_NOSIZE | SWP_NOMOVE);

                 SetWindowPos(hWnd, HWND_NOTOPMOST, , , , , SWP_NOSIZE | SWP_NOMOVE);

                 SetForegroundWindow(hWnd);

                 AttachThreadInput(dwCurID, dwForeID, false);

                 span1 = int.Parse("");

                Thread.Sleep(span1 * );

                //hWnd = FindWindow(null, "窗口自动切换");

                //hForeWnd = GetForegroundWindow();

                //dwCurID = GetCurrentThreadId();

                //dwForeID = GetWindowThreadProcessId(hForeWnd, null);

                //AttachThreadInput(dwCurID, dwForeID, true);

                //ShowWindow(hWnd, SW_ShowMaximized);

                //SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);

                //SetWindowPos(hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);

                //SetForegroundWindow(hWnd);

                //AttachThreadInput(dwCurID, dwForeID, false);

                //span1 = int.Parse("10");

                //Thread.Sleep(span1 * 1000);

             }

             while (n > );

         }

         private void btnStart_Click(object sender, EventArgs e)

         {

             Thread thread = new Thread(new ThreadStart(ExecChangeWindow));

           //  ThreadPool.QueueUserWorkItem(new WaitCallback(ExecChangeWindow));

         }

         private void btnStop_Click(object sender, EventArgs e)

         {

             n = ;

         }

         private void Form1_KeyDown(object sender, KeyEventArgs e)

         {

             if (e.KeyCode == Keys.F12)

             {

             }

         }

     }

 }

求教：为何我的主窗口切不到最上面，一直显示“无法响应”，我猜的原因是Thread.Sleep()导致的。

请问我该如何做，可以切到主窗口并能执行“停止”动作呢？

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