限制一次只能打开一个程序

ProcessManager.cs

internal static class ProcessManager
	{
		public static void GetProcessLock()
		{
			ProcessManager.ProcessLock = new Mutex(false, "Global\\LuYao.Toolkit[" + ProcessManager.GetUid() + "]", ref ProcessManager.HasLock);
			if (!ProcessManager.HasLock)
			{
				ProcessManager.ActiveWindow();
				Environment.Exit(0);
			}
		}

		private static string GetUid()
		{
			byte[] array = Encoding.UTF8.GetBytes(Assembly.GetExecutingAssembly().Location);
			using (MD5 md = MD5.Create())
			{
				array = md.ComputeHash(array);
			}
			return BitConverter.ToString(array);
		}

		public static void ActiveWindow()
		{
			using (Process currentProcess = Process.GetCurrentProcess())
			{
				foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName))
				{
					if (process.MainModule.FileName == currentProcess.MainModule.FileName)
					{
						ProcessManager.SwitchToThisWindow(process.MainWindowHandle, true);
						break;
					}
				}
			}
		}

		public static void ReleaseLock()
		{
			if (ProcessManager.ProcessLock != null && ProcessManager.HasLock)
			{
				ProcessManager.ProcessLock.Dispose();
				ProcessManager.HasLock = false;
			}
		}

		[DllImport("user32.dll")]
		public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

		private static Mutex ProcessLock;

		private static bool HasLock;
	}

https://www.coderbusy.com/archives/2837.html

/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
    public App()
    {
        ProcessManager.GetProcessLock();
    }
}