Microsoft.CSharp.RuntimeBinder.SymbolTable.GetOriginalTypeParameterType C# (CSharp) Method

        private Type GetOriginalTypeParameterType(Type t)
        {
            Debug.Assert(t.IsGenericParameter);

            int pos = t.GenericParameterPosition;

            Type parentType = t.DeclaringType;
            if (parentType != null && parentType.GetTypeInfo().IsGenericType)
            {
                parentType = parentType.GetTypeInfo().GetGenericTypeDefinition();
            }

            if (t.GetTypeInfo().DeclaringMethod != null)
            {
                MethodBase parentMethod = t.GetTypeInfo().DeclaringMethod;

                if (parentType.GetGenericArguments() == null || pos >= parentType.GetGenericArguments().Length)
                {
                    return t;
                }
            }

            while (parentType.GetGenericArguments().Length > pos)
            {
                Type nextParent = parentType.DeclaringType;
                if (nextParent != null && nextParent.GetTypeInfo().IsGenericType)
                {
                    nextParent = nextParent.GetTypeInfo().GetGenericTypeDefinition();
                }

                if (nextParent != null && nextParent.GetGenericArguments() != null && nextParent.GetGenericArguments().Length > pos)
                {
                    parentType = nextParent;
                }
                else
                {
                    break;
                }
            }

            return parentType.GetGenericArguments()[pos];
        }