WinForm 只运行一个程序实例代码,CSharp代码库,德仔网

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【CSharp】 WinForm 只运行一个程序实例
作者:Dezai.CN / 发布于2011/9/14/ 798
<div><span style="color: #0000ff">using</span><span style="color: #000000"> System;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Collections.Generic;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Windows.Forms;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Runtime.InteropServices;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Diagnostics;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Reflection;

</span><span style="color: #0000ff">namespace</span><span style="color: #000000"> WinFormStudy
{
</span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> Program
{

</span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
</span><span style="color: #808080">///</span><span style="color: #008000"> 应用程序的主入口点。
</span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #808080">
</span><span style="color: #000000">[STAThread]
</span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> Main()
{
Process instance </span><span style="color: #000000">=</span><span style="color: #000000"> RunningInstance();
</span><span style="color: #0000ff">if</span><span style="color: #000000"> (instance </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
{
</span><span style="color: #008000">//</span><span style="color: #008000">没有实例在运行</span><span style="color: #008000">
</span><span style="color: #000000">Application.Run(</span><span style="color: #0000ff">new</span><span style="color: #000000"> Form1());
}
</span><span style="color: #0000ff">else</span><span style="color: #000000">
{
</span><span style="color: #008000">//</span><span style="color: #008000">已经有一个实例在运行</span><span style="color: #008000">
</span><span style="color: #000000">HandleRunningInstance(instance);
}
}
</span><span style="color: #0000ff">#region</span><span style="color: #000000"> 确保程序只运行一个实例</span><span style="color: #000000">
</span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> Process RunningInstance()
{
Process current </span><span style="color: #000000">=</span><span style="color: #000000"> Process.GetCurrentProcess();
Process[] processes </span><span style="color: #000000">=</span><span style="color: #000000"> Process.GetProcessesByName(current.ProcessName);
</span><span style="color: #008000">//</span><span style="color: #008000">遍历与当前进程名称相同的进程列表 </span><span style="color: #008000">
</span><span style="color: #0000ff">foreach</span><span style="color: #000000"> (Process process </span><span style="color: #0000ff">in</span><span style="color: #000000"> processes)
{
</span><span style="color: #008000">//</span><span style="color: #008000">如果实例已经存在则忽略当前进程 </span><span style="color: #008000">
</span><span style="color: #0000ff">if</span><span style="color: #000000"> (process.Id </span><span style="color: #000000">!=</span><span style="color: #000000"> current.Id)
{
</span><span style="color: #008000">//</span><span style="color: #008000">保证要打开的进程同已经存在的进程来自同一文件路径</span><span style="color: #008000">
</span><span style="color: #0000ff">if</span><span style="color: #000000"> (Assembly.GetExecutingAssembly().Location.Replace(</span><span style="color: #800000">"</span><span style="color: #800000">/</span><span style="color: #800000">"</span><span style="color: #000000">, </span><span style="color: #800000">"</span><span style="color: #800000">\\</span><span style="color: #800000">"</span><span style="color: #000000">) </span><span style="color: #000000">==</span><span style="color: #000000"> current.MainModule.FileName)
{
</span><span style="color: #008000">//</span><span style="color: #008000">返回已经存在的进程</span><span style="color: #008000">
</span><span style="color: #0000ff">return</span><span style="color: #000000"> process;

}
}
}
</span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
}

</span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> HandleRunningInstance(Process instance)
{
MessageBox.Show(</span><span style="color: #800000">"</span><span style="color: #800000">已经在运行！</span><span style="color: #800000">"</span><span style="color: #000000">, </span><span style="color: #800000">"</span><span style="color: #800000">提示信息</span><span style="color: #800000">"</span><span style="color: #000000">, MessageBoxButtons.OK, MessageBoxIcon.Information);
ShowWindowAsync(instance.MainWindowHandle, </span><span style="color: #800080">1</span><span style="color: #000000">); </span><span style="color: #008000">//</span><span style="color: #008000">调用api函数，正常显示窗口</span><span style="color: #008000">
</span><span style="color: #000000">SetForegroundWindow(instance.MainWindowHandle); </span><span style="color: #008000">//</span><span style="color: #008000">将窗口放置最前端</span><span style="color: #008000">
</span><span style="color: #000000">}
[DllImport(</span><span style="color: #800000">"</span><span style="color: #800000">User32.dll</span><span style="color: #800000">"</span><span style="color: #000000">)]
</span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">extern</span><span style="color: #000000"> </span><span style="color: #0000ff">bool</span><span style="color: #000000"> ShowWindowAsync(System.IntPtr hWnd, </span><span style="color: #0000ff">int</span><span style="color: #000000"> cmdShow);
[DllImport(</span><span style="color: #800000">"</span><span style="color: #800000">User32.dll</span><span style="color: #800000">"</span><span style="color: #000000">)]
</span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">extern</span><span style="color: #000000"> </span><span style="color: #0000ff">bool</span><span style="color: #000000"> SetForegroundWindow(System.IntPtr hWnd);
</span><span style="color: #0000ff">#endregion</span><span style="color: #000000">
}
}</span></div>
<div><span style="color: #000000">或者</span></div>
<div><span style="color: #000000"><span style="color: #0000ff">using</span><span style="color: #000000"> System;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Collections.Generic;
</span><span style="color: #0000ff">using</span><span style="color: #000000"> System.Windows.Forms;

</span><span style="color: #0000ff">namespace</span><span style="color: #000000"> WinFormStudy
{
</span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> Program
{
</span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
</span><span style="color: #808080">///</span><span style="color: #008000"> 应用程序的主入口点。
</span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #808080">
</span><span style="color: #000000">[STAThread]
</span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> Main()
{
</span><span style="color: #0000ff">bool</span><span style="color: #000000"> ret;
System.Threading.Mutex m </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> System.Threading.Mutex(</span><span style="color: #0000ff">true</span><span style="color: #000000">, Application.ProductName, </span><span style="color: #0000ff">out</span><span style="color: #000000"> ret);
</span><span style="color: #0000ff">if</span><span style="color: #000000"> (ret)
{
System.Windows.Forms.Application.EnableVisualStyles(); </span><span style="color: #008000">//</span><span style="color: #008000">这两行实现 XP 可视风格 </span><span style="color: #008000">
</span><span style="color: #000000">System.Windows.Forms.Application.DoEvents(); 
System.Windows.Forms.Application.Run(</span><span style="color: #0000ff">new</span><span style="color: #000000"> Form1());
</span><span style="color: #008000">//</span><span style="color: #008000"> frmMain 为你程序的主窗体，如果是控制台程序不用这句 </span><span style="color: #008000">
</span><span style="color: #000000">m.ReleaseMutex();
}
</span><span style="color: #0000ff">else</span><span style="color: #000000">
{
MessageBox.Show(</span><span style="color: #0000ff">null</span><span style="color: #000000">, </span><span style="color: #800000">"</span><span style="color: #800000">有一个和本程序相同的应用程序已经在运行，请不要同时运行多个本程序。\n\n这个程序即将退出。</span><span style="color: #800000">"</span><span style="color: #000000">, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Warning);
</span><span style="color: #008000">//</span><span style="color: #008000"> 提示信息，可以删除。 </span><span style="color: #008000">
</span><span style="color: #000000">Application.Exit();</span><span style="color: #008000">//</span><span style="color: #008000">退出程序 </span><span style="color: #008000">
</span><span style="color: #000000">}
}
}
}</span></span></div>
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