System.Linq.CachedReflectionInfo.Union_TSource_3 C# (CSharp) Метод

        public static MethodInfo Union_TSource_3(Type TSource) =>
             (s_Union_TSource_3 ??
             (s_Union_TSource_3 = new Func<IQueryable<object>, IEnumerable<object>, IEqualityComparer<object>, IQueryable<object>>(Queryable.Union).GetMethodInfo().GetGenericMethodDefinition()))
              .MakeGenericMethod(TSource);