System.Linq.CachedReflectionInfo.GroupBy_TSource_TKey_TResult_4 C# (CSharp) Метод

        public static MethodInfo GroupBy_TSource_TKey_TResult_4(Type TSource, Type TKey, Type TResult) =>
             (s_GroupBy_TSource_TKey_TResult_4 ??
             (s_GroupBy_TSource_TKey_TResult_4 = new Func<IQueryable<object>, Expression<Func<object, object>>, Expression<Func<object, IEnumerable<object>, object>>, IEqualityComparer<object>, IQueryable<object>>(Queryable.GroupBy).GetMethodInfo().GetGenericMethodDefinition()))
              .MakeGenericMethod(TSource, TKey, TResult);