为什么退出应用程序时出现 win32exception 错误？

Question

在 Form1 关闭事件中，有时我会在选择 YES 关闭应用程序时遇到异常：

Environment.Exit(0);

这是 Form1 关闭事件代码：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {    
            if (MessageBox.Show("Are you Sure you want to Exit. Click Yes to Confirm and No to continue", "WinForm", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
            {
                e.Cancel = true;
            }
            else
            {
                e.Cancel = false;
                Environment.Exit(0);
            }


        }

异常：创建窗口句柄时出错

这是完整的异常错误信息：

System.ComponentModel.Win32Exception was unhandled
  HResult=-2147467259
  Message=Error creating window handle.
  Source=System.Windows.Forms
  ErrorCode=-2147467259
  NativeErrorCode=1406
  StackTrace:
       at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp)
       at System.Windows.Forms.Control.CreateHandle()
       at System.Windows.Forms.Control.get_Handle()
       at System.Windows.Forms.VisualStyles.VisualStyleRenderer.DrawParentBackground(IDeviceContext dc, Rectangle bounds, Control childControl)
       at System.Windows.Forms.ButtonInternal.ButtonStandardAdapter.PaintThemedButtonBackground(PaintEventArgs e, Rectangle bounds, Boolean up)
       at System.Windows.Forms.ButtonInternal.ButtonStandardAdapter.PaintWorker(PaintEventArgs e, Boolean up, CheckState state)
       at System.Windows.Forms.ButtonInternal.ButtonStandardAdapter.PaintUp(PaintEventArgs e, CheckState state)
       at System.Windows.Forms.ButtonInternal.ButtonBaseAdapter.Paint(PaintEventArgs pevent)
       at System.Windows.Forms.ButtonBase.OnPaint(PaintEventArgs pevent)
       at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
       at System.Windows.Forms.Control.WmPaint(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  InnerException: 

也许我需要释放/关闭/处置我没有的东西？

有时会出现异常，但有时现在不会出现，我尝试连续关闭应用程序 5 次，没有任何异常。

Answer 1

您实际上并不需要else 条件 - 如果他们选择“否”，您只需允许表单关闭。我可以看到调用Environment.Exit(0) 的唯一明显原因是当您有非模态表单（或其他进程）时，您也希望/需要关闭。循环遍历子表单并触发它们的关闭事件可能会更好。我曾经使用过这样的东西：

// Close each child window of this form
foreach ( Window window in Application.Current.Windows )
{
    if ( window != null && window.Owner == this )
    {
        window.Close();
    }
}

已经有一段时间了，但我相信您必须在创建表单时手动将 Owner 属性分配给它。

当然，您可能还有其他完全正当的理由致电Environment.Exit(0)。