C#單例項執行實現
在某些情況我們要求應用程式只能執行一次，後執行的例項要把之前執行的程式啟用並自己退出。

現在是程式碼,找了好久哦,大家給點掌聲吧,呵呵 .

關鍵詞:winform限制主程式執行一次,啟用程式,我是直接把我專案中Program.cs中的程式碼Copy過來了,希望大家不要見怪.
static class Program { // Uses to active the exist window [DllImport("User32.dll")] public static extern void SetForegroundWindow(IntPtr hwnd); [DllImport("User32.dll")] private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow); // 0-Hidden, 1-Centered, 2-Minimized, 3-Maximized private const int WS_SHOWNORMAL = 1; /// <summary> /// 應用程式的主入口點。 /// </summary> [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); //限制程式只打開一次 if (RunningInstance() == null) { Application.Run(new Form1()); } //Application.Run(new RecordQuery()); } /// <summary> /// 限制程式只打開一次 /// </summary> /// <returns></returns> public static Process RunningInstance() { Process current = Process.GetCurrentProcess(); Process[] processes = Process.GetProcessesByName(current.ProcessName); //Loop through the running processes in with the same name foreach (Process process in processes) { //Ignore the current process if (process.Id != current.Id) { //Make sure that the process is running from the exe file. if (Assembly.GetExecutingAssembly().Location.Replace("/", "//") == current.MainModule.FileName) { //Return the other process instance. ShowWindowAsync(process.MainWindowHandle, WS_SHOWNORMAL); SetForegroundWindow(process.MainWindowHandle); return process; } } } //No other instance was found, return null. return null; } }