在Enter事件中设置焦点的替代方法 [英] Alternative to set focus from within the Enter event

问题描述

我有一个文本框，并且在某些情况下，在Enter事件中，我需要将焦点设置为不同的文本框。

我试过这样的代码：

  private void TextBox1_Enter（object sender，EventArgs e）
 {
 if（_skipTextBox1）TextBox2.Focus（）; 
} 
  

但是这段代码不起作用。之后，我在MSDN上找到了：

不要试图在Enter，GotFocus，Leave，LostFocus，Validating或Valid事件处理程序。

所以我怎么能这样做呢？

解决方案

推迟执行Focus（）方法，直到事件完成执行。使用Control.BeginInvoke（）方法优雅地完成。像这样：

pre prerivate $ {textBox2_Enter（object sender，EventArgs e）{
this.BeginInvoke（（MethodInvoker）delegate {textBox3.Focus（）;}）;
}

I have a textbox and in some cases in Enter event I need to set the focus to a different textbox.

I tried that code:

 private void TextBox1_Enter(object sender, EventArgs e)
 {
     if(_skipTextBox1) TextBox2.Focus();
 }

But this code doesn't work. After that I found on MSDN:

Do not attempt to set focus from within the Enter, GotFocus, Leave, LostFocus, Validating, or Validated event handlers.

So how can I do it other way?

解决方案

Postpone executing the Focus() method until after the event is finished executing. Elegantly done by using the Control.BeginInvoke() method. Like this:

    private void textBox2_Enter(object sender, EventArgs e) {
        this.BeginInvoke((MethodInvoker)delegate { textBox3.Focus(); });
    }

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