如何在 c#.net3.5 中的按钮单击事件上设置焦点并启动已经运行的应用程序？

我一直在尝试使用互斥体的代码，但单击按钮后无法打开我的 exe 我成功地没有在单击按钮时在任务栏上多次输入应用程序，但只有当我关闭表单时才会启动我的应用程序。 我想在单击按钮时启动我的应用程序，如果应用程序已经启动，那么我需要关注以前运行的应用程序。 我怎样才能解决我启动、聚焦和重新打开该应用程序的需要。 我正在向您发送我在按钮单击事件上使用的代码，请修改我的错误...

在program.cs处编码

static void Main()  
{

    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);

    Application.Run(new Form1());
    System.Diagnostics.Process.Start("filename.exe");
}

:

在 form1.cs 完成编码

private void button1_Click(object sender, EventArgs e)
{
    try
    {
       bool createdNew;
       Mutex m = new Mutex(true, "e-Recording", out createdNew);
       System.Diagnostics.ProcessStartInfo f = new System.Diagnostics.ProcessStartInfo("C:\\windows\\system32\\rundll32.exe", "C:\\windows\\system32\\shimgvw.dll,ImageView_Fullscreen " + "filename.exe".TrimEnd(null));

        if (createdNew) Launch();

        else
        {
             MessageBox.Show("e-Recording is already running!", "Multiple Instances");
         }
     }
     catch (Exception ex)
     {
          System.Diagnostics.Debug.WriteLine(ex.ToString());
     }
}

这能够找到并切换到与您尝试启动的进程相匹配的已运行进程。

[DllImport( "user32.dll" )]
public static extern bool ShowWindowAsync( HandleRef hWnd, int nCmdShow );
public const int SW_RESTORE = 9;

public void SwitchToCurrent() {
  IntPtr hWnd = IntPtr.Zero;
  Process process = Process.GetCurrentProcess();
  Process[] processes = Process.GetProcessesByName( process.ProcessName );
  foreach ( Process _process in processes ) {
    // Get the first instance that is not this instance, has the
    // same process name and was started from the same file name
    // and location. Also check that the process has a valid
    // window handle in this session to filter out other user's
    // processes.
    if ( _process.Id != process.Id &&
      _process.MainModule.FileName == process.MainModule.FileName &&
      _process.MainWindowHandle != IntPtr.Zero ) {
      hWnd = _process.MainWindowHandle;

      ShowWindowAsync( NativeMethods.HRef( hWnd ), SW_RESTORE );
      break;
    }
  }
 }