System.Linq.CachedReflectionInfo.Sum_Single_TSource_2 C# (CSharp) Метод

        public static MethodInfo Sum_Single_TSource_2(Type TSource) =>
             (s_Sum_Single_TSource_2 ??
             (s_Sum_Single_TSource_2 = new Func<IQueryable<object>, Expression<Func<object, float>>, float>(Queryable.Sum).GetMethodInfo().GetGenericMethodDefinition()))
              .MakeGenericMethod(TSource);