c# - 如何检测区分外部 wm_close 与 form.close() 内部触发

Question

这是一个 C# 应用程序，作为通知图标位于托盘中并执行其操作，直到有人右键单击它并选择关闭(菜单选项)或者它从外部应用程序或操作系统在重新启动期间获取 wm_close .

protected override void WndProc(ref Message m)
{
   case  Win32.WmClose:
  //recvd message to shutdown
   Program.Log.InfoFormat("Shutdown received at {0}", DateTime.Now);
   CleanUp();
   this.Close(); //this is the main form
   break;

   //other case statements here
}

//somewhere else on menu exit of notify icon
 private void toolStripMenuItemExit_Click(object sender, EventArgs e)
 {
        Program.Log.InfoFormat("Manual EXIT at {0}", DateTime.Now);
        CleanUp();
        this.Close(); //this is the main form
 }

this.close() 会触发另一个 WM_CLOSE，使应用程序陷入困惑。处理这种情况的正确方法是什么？谢谢

Answer 1

处理表单 Closing 事件。每当您想退出时，只需调用 Close();，并使任何其他操作依赖于关闭事件中的关闭，而不是在 WndProc 和 toolStripMenuItemExit_Click 中处理它，所以:

private void OnFormCloseing(object sender, FormClosingEventArgs e)
{
    string reason = string.Empty;
    switch (e.CloseReason)
    {
        case CloseReason.UserClosing:
            reason = "Manual EXIT";
            break;

        case CloseReason.WindowsShutDown:
            reason = "Shutdown received";
            break;
    }
    Program.Log.InfoFormat(reason + " at {0}", DateTime.Now);
    CleanUp();
}

private void toolStripMenuItemExit_Click(object sender, EventArgs e)
{
    this.Close(); //this is the main form
}

CloseReason 的更多成员 here .