How to make Resharper resolve path for CustomBinding MarkupExtension

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.

You should access your custom Markup-Extension, using the correct namespace:

<UserControl x:Name="uc" ...xmlns:ext="clr-ns:YourProjectNamespace">  <TextBox Text="{ext:CustomBinding ViewModel.CurrentText, ElementName=uc}" /></UserControl>

Here is a nice article about creating custom Markup-Extensions.

One way to fool R# is to name it Binding:

public class Binding : MarkupExtension{    public Binding()    {    }    public Binding(string path)    {        Path = path;    }    public string Path { get; set; }    public override object ProvideValue(IServiceProvider serviceProvider)    {        return 5;    }}

Then it works the same as standard binding with R#

<TextBlock Text="{custom:Binding SomeProp}" />