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c#wpfxaml
methuselah
methuselah

Reputation: 13206

Getting the name of the textbox currently in focus

How do you get the name of the textbox currently in focus on XAML applications?

I've tried the below, but keep getting the following error message: Object reference not set to an instance of an object. What am I doing wrong?

var textbox = Keyboard.FocusedElement as TextBox;
MessageBox.Show(textbox.Name);

Upvotes: 0

Views: 180

Answers (1)

Grant Winney
Grant Winney

Reputation: 66439

If the element that has focus is not a TextBox, you're going to get the exception you're seeing, so you should test for that:

var textbox = Keyboard.FocusedElement as TextBox;

if (textbox != null)
    MessageBox.Show(textbox.Name);

Also, if this code is being executed in a button click (for example), you'll have to make sure the button can't steal focus from whatever element currently has it by setting "Focusable" to false:

<Button Content="Press" Focusable="False" Command="{Binding Path=PressCommand}" />

Upvotes: 1

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