c#、列表框、stackOverflow 异常

Question

继承KryptonToolkit ListBox控件获取SelectedItemChanging事件。

public class CPListBox : KryptonListBox
{       
    public event CancelEventHandler SelectedIndexChanging;

    protected virtual void OnSelectedIndexChanging(CancelEventArgs e)
    {
        SelectedIndexChanging(this, e);
    }

    protected override void OnSelectedIndexChanged(EventArgs e)
    {           
        CancelEventArgs cArgs = new CancelEventArgs();
        OnSelectedIndexChanged(cArgs);

        if(!cArgs.Cancel)
        {
            base.OnSelectedIndexChanged(e);
        }
    }
}

在表单中我用代码处理事件:

    void UsersListBoxSelectedIndexChanging(object sender, CancelEventArgs e)
    {
        if(_presenter.CurrentUser.IsModified)
        {
            MessageBox.Show("Nie zapisales zmian!");
            e.Cancel = true;
        }

    }

我得到了 stackOverflow ;) 异常。也许有人现在这段代码出了什么问题？

Answer 1

您将永远递归地调用方法本身。这些递归调用没有终止条件。这会导致 Stack Overflow。

protected override void OnSelectedIndexChanged(EventArgs e)
{                       
       CancelEventArgs cArgs = new CancelEventArgs();
       OnSelectedIndexChanged(cArgs); // Clearly calling yourself indefinitely.
       //...
}