Prevent WinForm AcceptButton handling Return key

I have a form with a button hooked up to the AcceptButton property so that logic occurs and the form is closed when the user presses the Return key.

On 开发者_JAVA百科that form I display a dynamically created TextBox that appears when the user double-clicks a certain area then hides when the user presses Return.

How do I prevent the form from processing the key press when the user presses Return while the TextBox has focus?

I was attempting to say the key press was handled in the TextBox.KeyDown event handler via KeyEventArgs.Handled but the Button.Click event of my accept button is being fired first...

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While resetting the Forms AcceptButton while the TextBox has focus will work, I believe that the more appropriate solution is to use the TextBoxes AcceptsReturn Property.

If you set

myTextBox.AcceptsReturn = true;

the Form will not accept on pressing RETURN, but your TextBox can handle this itself.

This will avoid the need to reset the AcceptButton in multiple places in your code.

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Use the Enter and Leave events of the TextBox to set the AcceptButton property to null (on Enter) and re-assign the button to it (on Leave).

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Set the AcceptButton property to null when you create that textbox, and set it back to the normal value when it loses focus:

var myTextBox = new TextBox ... ;
AcceptButton = null;

myTextBox.Leave += (s, e) => { AcceptButton = btnOK; };

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To get a complete working example, use the AcceptReturn=true of the TextBox as NobodysNightmare suggested and set the SuppressKeyPress to true to avoid bubble the event to the Form. To use the AcceptButton you need to set/reset the AcceptButton property when you enter/leave the texbox as Fredrik Mörk suggested.

var tb = new TextBox ...;  
IButtonControl _oldAcceptButton = null;  
tb.AcceptReturn=true;
tb.KeyDown += (s,e) => {
  if(e.KeyCode==Keys.Enter) {
    e.Handled=true;
    //will not inform any parent controls about the event.
    e.SuppressKeyPress=true;

    //do your own logic
    ....
  }
};
tb.Enter+=(s,e)=> {
  _oldAcceptButton = AcceptButton;
  AcceptButton = null;
};
tb.Leave+=(s,e)=>{
  AcceptButton = _oldAcceptButton;
};