可以在第二次覆盖自定义控制调用的onleave吗？(it is possiable to override onleave of custom contol call to second time?)

 首先，我们需要覆盖一个自定义控件，使文本框文本Titlecase在该CaseingTxtBox离开时，第二次我们在表单中使用该离开事件来调用某个方法。 这可能吗？ 
 
 我们尝试了下面的代码，但我们每次都会调用CaseingTxtBox的Onleave事件，但是没有调用firstNameTextBox_Leave() 
 
 我创建了一个自定义控件，为我的文本框添加了正确的大小写，并继承自TextBox ，我们使用文本框的Leave事件来创建自定义文本框的文本标题大小写。 
 
public class CaseingTxtBox : TextBox
{  
    protected override void OnLeave(EventArgs e)
    {
        Text = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Text.ToLower());
        //first call this event for make text titlecase
    }
}
 
 我们在我的表单中使用了CaseingTxtBox控件来使文本正确，并且效果非常好。 我们还使用该控件的Leave事件来调用方法，但不调用该方法。 
 
this.firstNameTextBox.Leave += new System.EventHandl(this.firstNameTextBox_Leave);

 private void firstNameTextBox_Leave(object sender, EventArgs e)
{
    MessageBox.Show("hello");
    //second time call this event for call some method or propmt   messagebox onleave of CaseingTxtBox .
}

First we need to override a custom control to make textbox text Titlecase on leave of that CaseingTxtBox and second time we use that leave event in a form to call some method. Is this possible?
 
We tried the code below for that but we get a call every time for CaseingTxtBox's Onleave event but no call for firstNameTextBox_Leave()
 
I made a custom control that doed proper case for my textbox and that inherits from TextBox and we use the Leave event of the textbox to make the custom textbox's text title case.
 
public class CaseingTxtBox : TextBox
{  
    protected override void OnLeave(EventArgs e)
    {
        Text = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Text.ToLower());
        //first call this event for make text titlecase
    }
}
 
We use that CaseingTxtBox control in my form to make text proper case and that works very well. We also use Leave event of that control to call a method but that method is not called.
 
this.firstNameTextBox.Leave += new System.EventHandl(this.firstNameTextBox_Leave);

 private void firstNameTextBox_Leave(object sender, EventArgs e)
{
    MessageBox.Show("hello");
    //second time call this event for call some method or propmt   messagebox onleave of CaseingTxtBox .
}

原文：https://stackoverflow.com/questions/32667600