How to associate constants with an interface in C#?

Question

Some languages let you associate a constant with an interface:

• A Java example
• A PhP example

The W3C abstract interfaces do the same, for example:

// Introduced in DOM Level 2:
interface CSSValue {

  // UnitTypes
  const unsigned short      CSS_INHERIT                    = 0;
  const unsigned short      CSS_PRIMITIVE_VALUE            = 1;
  const unsigned short      CSS_VALUE_LIST                 = 2;
  const unsigned short      CSS_CUSTOM                     = 3;

  attribute DOMString       cssText;
  attribute unsigned short  cssValueType;
};

I want to define this interface such that it can be called from C#.

Apparently C# cannot define a constant associated with an interface.

• What is the usual way to translate such an interface to C#?
• Are there any 'canonical' C# bindings for the DOM interfaces?
• Although C# cannot, is there another .NET language which can define constants associated with an interface?

Answer 1

C# 8 now allows constants in an interface definition.