收藏 不显示删除回复显示所有回复显示星级回复显示得分回复 WinForm 只允许一个实例运行的问题[问题点数:20分，无满意答案结帖，结帖人:ShinyWong]

        static void Main(string[] args)
        {
            bool createNew;
            Mutex m = new Mutex(false, "MyApp", out createNew);
            if (!createNew)
            {
                //已经有一个实例在运行了
            }

        }

using System;
using System.Windows.Forms;
using System.Threading;
 
class App : Form
{
     Mutex mutex;
     App()
     {
         Text = "Single Instance!";
         mutex = new Mutex(false, "SINGLE_INSTANCE_MUTEX");
         if (!mutex.WaitOne(0, false)) 
         {
              mutex.Close();
              mutex = null;
         }
     }
     protected override void Dispose(bool disposing)
     {
         if (disposing)
              mutex.ReleaseMutex();
         base.Dispose(disposing);
     }
     static void Main()
     {
         App app = new App();
         if (app.mutex != null)
             Application.Run(app);
         else 
             MessageBox.Show("Instance already running");
     }
}