TextBox TextChanged event on programmatic versus user change of text contents

Question

I would like to differentiate between changing the text programmatically (for example in a button click handler event) and user input (typing, cutting and pasting text). <

Answer 1

Depending on your exact demands you can use TextBox.IsFocused in the TextChanged event to determine manual input. This will obviously not cover all ways of programmatical changes, but works for a lot of examples just fine and is a pretty clean and save way of doing so.

Basically this works if:
...the programmatical changes are all based on a manual change (e.g. a Button press).
It will not work if:
...the programmatical changes are completely based on code (e.g. a Timer).

Code example:

textBox.TextChanged += (sender, args) =>
    if (textBox.IsFocused)
    {
        //do something for manual input
    }
    else
    {
        //do something for programmatical input
    }
}