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How do you set a custom MarkupExtension from code? You can easily set if from Xaml. The same goes for Binding and DynamicResource . <TextBox FontSize="{Binding MyFontSize}" Style="{DynamicResource MyStyle}" Text="{markup:CustomMarkup}"/> Setting the same values through code behind requires a little different approach Binding: Use textBox.SetBinding or BindingOperations.SetBinding Binding binding = new Binding("MyFontSize"); BindingOperations.SetBinding(textBox, TextBox.FontSizeProperty, binding); DynamicResource: Use SetResourceReference textBox.SetResourceReference(TextBox.StyleProperty, "MyStyle"); CustomMarkup: How do I set a custom MarkupExtension from code? Should I call ProvideValue and it that case, how do I get a hold of a IServiceProvider ?* CustomMarkupExtension customExtension = new CustomMarkupExtension(); textBox.Text = customExtension.ProvideValue(??); I found surprisingly little on the subject so, can it be done? H.B. has answered the question. Just adding some details here to why I wanted to do this. I tried to create a workaround for the following problem. The problem is that you can't derive from Binding and override ProvideValue since it is sealed. You'll have to do something like this instead: A base class for custom WPF binding markup extensions . But then the problem is that when you return a Binding to a Setter you get an exception, but outside of the Style it works fine. I've read in several places tha

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