C#打开exe，doc，excel程序并监视其是否关闭

PROCESS_INFORMATION pi = new PROCESS_INFORMATION(); STARTUPINFO si = new STARTUPINFO(); si.cb = Marshal.SizeOf(si); StringBuilder sb = new StringBuilder(@"C:\WINDOWS\notepad.exe c:\1.txt"); if (CreateProcess(null,sb, IntPtr.Zero, IntPtr.Zero, false, 0, IntPtr.Zero, IntPtr.Zero, ref si, ref pi)) { uint result = WaitForSingleObject(pi.hProcess, INFINITE); if (result == WAIT_OBJECT_0) { Int32 returnCode; if (GetExitCodeProcess(pi.hProcess, out returnCode)) { MessageBox.Show("关闭了"); } } CloseHandle(pi.hProcess); CloseHandle(pi.hThread); } 在WinForm中打开Word,Txt等，并监视其关闭