With the Telerik Silverlight controls, how can I cast a RadMaskedTextBox as a TextBox

问题

I am trying to determine if a Telerik RadMaskedTextBox allows multiline input.

I the debugger, I was able to find and check the .AcceptsReturn property of the underlying textbox, using:

((System.Windows.Controls.TextBox)(((Telerik.Windows.Controls.RadMaskedTextBox)(this)).textBox)).AcceptsReturn;

However, when I paste that into my C# code, the compiler complains that RadMaskedTextBox cannot be cast as a TextBox

A little weird, since the Debugger allows it.

The debugger also allows:

((System.Windows.Controls.TextBox)(((Telerik.Windows.Controls.RadMaskedTextBox)(this)).textBox)).TextWrapping

this the compiler complains about

Any ideas?

回答1:

I tried to do this in the past (sorry can't remember the exact way to go about this) but I had to traverse the object and find the textbox control. If I can find the project where I did it I will update my answer.

回答2:

From the Telerik Support Forum:

The underlying TextBox is of type ExtendedTextBox. You can access it like so:

var innerBox = this.masktextBox.ChildrenOfType<Telerik.Windows.Controls.MaskedTextBox.ExtendedTextBox>().FirstOrDefault();

来源：https://stackoverflow.com/questions/6085317/with-the-telerik-silverlight-controls-how-can-i-cast-a-radmaskedtextbox-as-a-te