摘要：public static IEnumerable<TSource> DistinctBy<TSource, TKey> (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) { HashSet<TKey> seenK 阅读全文

摘要：var linqResult = from c in Result.AsEnumerable() group c by new { a = c.site_address_apartment, b = c.deli_dt } into s select new CommunityAnalysisVO 阅读全文

摘要：var PartinoByList = list.OrderBy(x => x.DateType).GroupBy(x => new { x.ProductCatagoryId, x.SupplierName, x.ChannelName }) .Select(g => new { g, count 阅读全文

摘要：Linq/EF/lambda Group by/Order by 多个字段详细用法 1）单个字段Group by： //a.Key类型与a.Province字段类型一样 1 .GroupBy(a => a.Province).Select(a => a.Key).ToList(); 2）多个字段Gr 阅读全文