在接收Process.Exited事件时更新父进程GUI - WPF

时间:2011-01-27 20:06:50

标签: c# wpf events process system.diagnostics

我正在尝试在应用程序中启动进程。下面的代码只需在单击主GUI的按钮时启动记事本。现在,当启动记事本时,按钮被禁用。我已经订阅了Process.Exited甚至在记事本应用程序关闭时收到通知。收到通知后,我想再次重新启用该按钮。

然而,当我调用button1.IsEnabled = true时,代码崩溃了;似乎Process.Exit不是主GUI线程的一部分,因此当我尝试更新GUI时,它崩溃了。此外,当我调试时,我没有收到任何异常,说我试图从外部或东西访问主线程。

有没有办法在子进程退出时通知GUI?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Diagnostics;

namespace ProcessWatch
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        Process pp = null;
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            pp = new Process();
            pp.EnableRaisingEvents = true;
            pp.Exited += new EventHandler(pp_Exited);
            ProcessStartInfo oStartInfo = new ProcessStartInfo();
            oStartInfo.FileName = "Notepad.exe";
            oStartInfo.UseShellExecute = false;
            pp.StartInfo = oStartInfo;
            pp.Start();
            button1.IsEnabled = false;
        }

        void pp_Exited(object sender, EventArgs e)
        {
            Process p = sender as Process;
            button1.IsEnabled = true;               
        }
    }
}

1 个答案:

答案 0 :(得分:1)

尝试以下方法:

void pp_Exited(object sender, EventArgs e){ 
   Dispatcher.BeginInvoke(new Action(delegate {    
      button1.IsEnabled = true;       
   }), System.Windows.Threading.DispatcherPriority.ApplicationIdle, null);
}