static class Program
{
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(System.IntPtr hWnd);
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
bool createNew;
using (System.Threading.Mutex m = new System.Threading.Mutex(true, Application.ProductName, out createNew))
{
if (createNew)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Main());
}
else
{
MessageBox.Show("Only one instance of this application is allowed!");
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName(current.ProcessName);
//遍历与当前进程名称相同的进程列表
foreach (Process process in processes)
{
//如果实例已经存在则忽略当前进程
if (process.Id != current.Id)
{
//保证要打开的进程同已经存在的进程来自同一文件路径
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
{
ShowWindowAsync(process.MainWindowHandle, 1); //调用api函数，正常显示窗口
SetForegroundWindow(process.MainWindowHandle); //将窗口放置最前端
}
}
}
}
}
}
}
留待后查，同时方便他人
