在输入文本之前专注于 TextBox C#

Question

I am trying to set the focus on a textbox using the below methods:

Windows.UI.Core.CoreWindow.GetForCurrentThread().KeyDown += HandleKeyDown;
Windows.UI.Core.CoreWindow.GetForCurrentThread().CharacterReceived += HandleCharacter;

But the problem is the characters reach the screen before the textbox gets focused and so do not display properly. Is there a way to delay the characters from appearing before the textbox is focused?

Putting a Delay in HandleKeyDown sure delays the method but that does not stop CharacterReceived while the delay is still in progress.

Thanks

public void HandleKeyDown(Windows.UI.Core.CoreWindow window, Windows.UI.Core.KeyEventArgs e)

{

 if (e.VirtualKey== Windows.System.VirtualKey.F12)

{

//do something here for the characters that follow this key

Task.Delay(500);

//this task gets delayed but the other characters that follows f12 keypress keep showing up in the screen.

}

}

Answer 1

You can use the Shown event of main form. In this method you put for example Textbox1. Focus=True. For example

Private void frmMainProgram_Shown(sender As System.Object, e As System.EventArgs) {
    TextBox1.Focus();
} 

Answer 2

Try with keyup property. It will give some delay and focus on keyup

CoreWindow.KeyUp

Answer 3

Was able to take care of this using

KeyboardDeliveryInterceptor kbinterceptor = KeyboardDeliveryInterceptor.GetForCurrentView();
kbinterceptor.IsInterceptionEnabledWhenInForeground = true;