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Tuesday, May 12, 2009

Getting at the Text of a ComboBox in WPF – Part 2

- You all finished?
- Yeup, it compiles!

At the end of the day yesterday I thought I had made a bit of progress with my filtered-combo box. Unfortunately, though it compiles, I’ve found that I can’t get my app loaded and binding to that event at run-time gives me an exception.

However, in looking for a solution, I found the DependencyPropertyDescriptor object, which allows us to access dependency properties from code.  Using this object I can now observe the text for changes and add my event handler as such:

public Window1()

DependencyPropertyDescriptor comboText;
comboText = DependencyPropertyDescriptor.FromProperty(ComboBox.TextProperty, typeof(ComboBox));
comboText.AddValueChanged(this, this.ComboTextChanged);

private void ComboTextChanged(object sender, EventArgs e)
// ...

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