System.Linq.CachedReflectionInfo.First_TSource_1 C# (CSharp) Метод

        public static MethodInfo First_TSource_1(Type TSource) =>
             (s_First_TSource_1 ??
             (s_First_TSource_1 = new Func<IQueryable<object>, object>(Queryable.First).GetMethodInfo().GetGenericMethodDefinition()))
              .MakeGenericMethod(TSource);