C＃Windows窗体关闭

Question

I have a C# windows form Menu based application in .Net framework 4.0. in my option there are too many controls are added in form. a DataGridView is my first control on form. I handled a event on DataGridViewCellDoubleClick , in this event I am set values of all controls, and too many events are fire from this event and too many method is also called from this event.

My question is i double click on DataGridViewCell then immediately i click on my form exit button. my form is immediately close but my CellDoubleClick event is fired and it is executing and i have too many problems and exceptions occur because form is closed but my code is executing.

How can I resolve this problem that either form not close when my event is completely execute, or my event is should not execute or i can do some code in Closing event of form that prevent me from this problem.

Answer 1

监听FormClosing事件，然后在后台进程繁忙时将e.Cancel = true设置e.Cancel = true 。

Answer 2

Add this login in your code... I hop this will work.

bool inProcess = false;

private void DataGridViewCellDoubleClick(...)
{
   inProcess = true;
   //Write all ur code
   inProcess = false;
}

private void Form_Closing(...)
{
   e.Cancel = inProcess;
}

Answer 3

@Shell is on the right track, but to close the form when the code is finished instead of cancelling the Form_Close try this:

bool inProcess = false;

private void DataGridViewCellDoubleClick(...)
{
    inProcess = true;
    //Write all your code
   inProcess = false;
}

private void Form_Closing(...)
{
    while(inProcess)
    {
    Application.DoEvents();
    }
}

After some research based on the commentor's hint I have to add that your form would not be disabled during the while-loop, so that there is plenty of opportunity for the user to mess up your execution order. If you would hide the form or disable all controls before entering the while-loop this would be less severe, but using a seperate thread is the proper way to go.

Answer 4

如果要退出应用程序（如果主窗体上有数据网格），而不仅仅是退出窗口，则可以使用Application.ExitThread方法-ExitThread（）或Application.Exit（）方法（如果您具有IsBackground属性）设置为true将会杀死进程线程，并应停止触发事件。