使windows应用程序中只有一个实例

using System;

using System.Diagnostics;

using System.Windows.Forms;

using System.Reflection;

using System.Runtime.InteropServices;

using Zhzuo.WinGui;

namespace Zhzuo

{

/// <summary>

/// AppStart 的摘要说明。

/// </summary>

public class ApplicationStart

{

private const int WS_SHOWNORMAL = 1;

[DllImport("User32.dll")]

private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);

[DllImport("User32.dll")]

private static extern bool SetForegroundWindow(IntPtr hWnd);

/// <summary>

/// 应用程序的主入口点。

/// </summary>

[STAThread]

static void Main()

{

Process instance = GetRunningInstance();

if(instance == null)

{

//初始化程序配置信息

//ApplicationSettings.Initialize();

Application.Run(new MainForm());

}

else

{

HandleRunningInstance(instance);

}

}

/// <summary>

/// 获取应用程序的实例,没有其它的例程，返回Null

/// </summary>

/// <returns></returns>

public static Process GetRunningInstance()

{

Process current = Process.GetCurrentProcess();

Process[] processes = Process.GetProcessesByName(current.ProcessName);

//遍历正在有相同名字运行的例程

foreach (Process process in processes)

{

//忽略现有的例程

if (process.Id != current.Id)

//确保例程从EXE文件运行

if (Assembly.GetExecutingAssembly().Location.Replace("/", "//") == current.MainModule.FileName)

//返回另一个例程实例

return process;

}

return null;

}

/// <summary>

/// 获取窗口句柄

/// </summary>

/// <param name="instance"></param>

public static void HandleRunningInstance(Process instance)

{

//确保窗口没有被最小化或最大化

ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL);

//设置真实例程为foreground window

SetForegroundWindow (instance.MainWindowHandle);

}

}

}