Question

I want to simulate user input to a WPF TextBox. I want to input a character such that the OnPreviewTextInput event is triggered. I tried setting the Text through the Text property, but this didn’t trigger the event:

public void SomeFunction()
{
    var textBox = new TextBox();
    textBox.Text = "A";                     
}

Can I trigger the event explicitly somehow?

Answer 1

See the answer to How can I programmatically generate keypress events in C#? for a good description of how to simulate input events.

You could also do:

TextCompositionManager.StartComposition(
    new TextComposition(InputManager.Current, textBox, "A"));

This will raise the PreviewTextInput event and then raise the TextInput event and change the text.