it would be nice if C# supported syntax like: public static DependencyProperty Register(static DependencyProperty x, string name, Type propertyType, Type ownerType, FrameworkPropertyMetadata typeMetadata) that is static extension methods for classes, that can be invoked without a class instance (just with the class type), apart from normal ...

I was hoping C# would someday add static extension support for constructors too (apart from classic methods), that would help a lot in source-level compatibility layers (for example at my WPF_Compatibility project for WPF syntax in Silverlight, which one can find under the ClipFlair source base). However, according to : ...