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linq to sql orDEr By

db.S.Where(q=>q.TypeID==1).OrderByDesending(q=>q.ID).Take(1);

private static IEnumerable Sort(IEnumerable source, string propertyName, bool asc) { Func func = s => s.GetType().GetProperty(propertyName).GetValue(s, null); if (asc) return source.OrderBy(func); return source.OrderByDescendin...

LINQ 按多个字段排序(orderby、thenby、Take) orderby 子句解析为 OrderBy()方法,orderby descending 子句解析为OrderBy Descending()方法: var racers = Formula1.GetChampions(). Where(r = > r.Country == "Brazil"). OrderByDescending(...

var c = db.Table.OrderByDescending(q=>q.ID).Take(10);

[Table(Name="t_news")] public class t_news { public string id{get;set} public string name{get;set} public string addtime{get;set} //类型和数据库类型要一致 } public t_news[] Test() { DataContext con = new DataContext("server=.;d...

多个字段就是在原来的基础上再次排序,参考: var pn = (from m in (from m in blist orderby m.score descending select m) orderby m.year descending select m);

先对a,b进行group by 分组,然后针对分组select的时候new 一个匿名对象,包含 absum 和的值出来,针对和进行order by 不就行了

static void Main(string[] args) { string[] all = new string[] { "a2", "b6", "4", "5", "3", "cc1.1" }; var v = all.Select(a => new { a, ints = new string(a.Where(c => char.IsDigit(c) || c == '.').ToArray()) }).Select(b => new { ...

按指定分组方法对序列中的项目进行分组 联接 GroupJoin 通过归组将两个序列联接在一起 Join 将两个序列从内部联接起来 排序 OrderBy 以升序按值排列序列

text类型就别做DISTINCT了,效率会让你吐血。 实在想做的话,尝试newslist = newslist.OrderBy(x=>x.nID).ToList().Distinct(); 将数据加载入内存,用CLR来做DISTINCT

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