How To Detect If Type is Another Generic Type

Question

example:

public static void DoSomething<K,V>(IDictionary<K,V> items) {    items.Keys.Each(key => {       if (items[key] **is IEnumerable<?>**) { /* do something */ }       else { /* do something else */ } } 

Can this be done without using reflection? How do I say IEnumerable in C#? Should I just use IEnumerable since IEnumerable<> implements IEnumerable?

Answer 1

Thanks very much for this post. I wanted to provide a version of Konrad Rudolph's solution that has worked better for me. I had minor issues with that version, notably when testing if a Type is a nullable value type:

public static bool IsAssignableToGenericType(Type givenType, Type genericType) {     var interfaceTypes = givenType.GetInterfaces();      foreach (var it in interfaceTypes)     {         if (it.IsGenericType && it.GetGenericTypeDefinition() == genericType)             return true;     }      if (givenType.IsGenericType && givenType.GetGenericTypeDefinition() == genericType)         return true;      Type baseType = givenType.BaseType;     if (baseType == null) return false;      return IsAssignableToGenericType(baseType, genericType); }