System.Linq.CachedReflectionInfo.SelectMany_TSource_TResult_2 C# (CSharp) Метод

        public static MethodInfo SelectMany_TSource_TResult_2(Type TSource, Type TResult) =>
             (s_SelectMany_TSource_TResult_2 ??
             (s_SelectMany_TSource_TResult_2 = new Func<IQueryable<object>, Expression<Func<object, IEnumerable<object>>>, IQueryable<object>>(Queryable.SelectMany).GetMethodInfo().GetGenericMethodDefinition()))
              .MakeGenericMethod(TSource, TResult);