It's fine to have a static field in a generic type, so long as you know that you'll really get one field per combination of type arguments. My guess is that R# is just warning you in case you weren't aware of that.

Here's an example of that:

using System;public class Generic
     
      {    // Of course we wouldn't normally have public fields, but...    public static int Foo;}public class Test{    public static void Main()    {        Generic
      
       .Foo = 20;        Generic
       
      
     

 

As you can see, Generic<string>.Foo is a different field from Generic<object>.Foo - they hold separate values.