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Asked: 2026-05-26T10:07:01+00:00

I want to create some extended Binding-Markup-Extension, which behaves just like a normal WPF-Binding

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I want to create some extended Binding-Markup-Extension, which behaves just like a normal WPF-Binding but does some things more (use different defaults, maybe add some behavior, etc.).
Code looks like this:

public class CustomBindingExtension : Binding
{
  .. some extra properties and maybe overrides ...
}

It all works fine including XAML-intellisense, except I just can’t make Resharper resolve my Binding-Path correctly.
I.e.: using this code I can [Strg]+Click on ‘CurrentText’ and Resharper lets vs2010 navigate to the code defining the CurrentText-Property.

<UserControl x:Name="uc" ...>
  <TextBox Text="{Binding ViewModel.CurrentText, ElementName=uc}" />
</UserControl>

But using my binding, which works correctly at runtime, I just get a Tooltip when hovering ‘CurrentText’ telling me it is some ‘MS.Internal.Design.Metadata.ReflectionTypeNode’, and no navigation via [Strg]+Click.

<UserControl x:Name="uc" ...>
  <TextBox Text="{util:CustomBinding ViewModel.CurrentText, ElementName=uc}" />
</UserControl>

I tried the following things:

  • Derive from Binding
  • Derive from BindingDecoratorBase
  • Leave out the ‘Extension’ suffix for my CustomBinding-class
  • put the Markup-Extension in a separate assembly
  • Use ConstructorArgumentAttribute
  • Property of type string and type PropertyPath for the Path-Property

    • I also looked at the original classes Binding and BindingBase, but could not find any more difference to my code.
    Any ideas what should help here?
    Or is this just a special treatment of the Binding-MarkupExtension which I can in no way get for my own MarkupExtensions?

    Update 16.03.2011: Might also be bug or deficiency of Resharper, Jetbrains is investigating the issue: http://youtrack.jetbrains.net/issue/RSRP-230607

    Update 10.12.2013: Meanwhile, the feature seems to be working (with R# 7.1.3, maybe also earlier versions), I actually use the approach with the BindingDecoratorBase and I like it a lot.
    Maybe it only works, if your MarkupExtension ends on ‘Binding’, but mine does, so I am happy.

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    1 Answer

    1. Editorial Team

      Actually it’s not possible in current versions of R# and, unfortunately, still be missing feature of upcoming R# 6.1 release.

      This feature requires a lot of infrastructure changes, but it’s on our list and definitely will be implemented in R# 7. Seems like [CustomBindingMarkup] and [BindingPath] (for path constructor parameter and the Path property) attributes will be introduced.

      We really apologize for any inconvenience.

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