SCRGroupLine/GroupLine.App/App.xaml.cs

using System.Windows;

namespace GroupLine.App
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App : Application
    {
        private static System.Threading.Mutex mutex;
        protected override void OnStartup(StartupEventArgs e)
        {
            mutex = new System.Threading.Mutex(true, "OnlyRun_CRNS");
            if (mutex.WaitOne(0, false))
            {
                base.OnStartup(e);
            }
            else
            {
                MessageBox.Show("程序已经在运行！", "提示");
                this.Shutdown();
            }
        }
    }
}