Solution to the problem of MessageBox's carriage-Enter key callback in C# KeyUp event

This article analyzes the solution to the callback problem of MessageBox's carriage return (Enter) key in C# KeyUp event. The specific questions are as follows:

There is a Textbox control named txtTest on a form. If the Enter key is pressed in the KeyUp event of this control, the message box message box pops up, then if the Enter key is pressed in the pop-up messagebox to execute the button on the messagebox, the Enter key will continue to be executed in the KeyUp event. If you keep pressing the Enter key, the cycle will be performed.

The code looks like this:

private void txtTest_KeyUp(object sender, KeyEventArgs e)
{
if ( == )
{
if (("Entered?", , , )
== )
{
 = ;
}

}
}

To avoid this situation, you can move the program in KeyUp to the KeyDown event

private void txtTest_KeyDown(object sender, KeyEventArgs e)
{
if ( == )
{
if (("Entered?", , , )
== )
{
 = ;
}

}
}

In this way, the Enter key callback problem will not occur in KeyDown.