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C linq orDErBy

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(...

List和T[],在使用LINQ排序时都是使用相同的方式 list.OrderBy(i=>i.Property)即可

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

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);

string[] names = { "Hello", "Good", "YES", "HOME", "Diyo" }; string[] names_asc = names.OrderBy(t => t).ToArray(); string[] names_desc = names.OrderByDescending(t => t).ToArray();

利用扩展方法OrderByDescending对数组进行降序排序 using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication4{ class Program { static void Main(string[] args) { int[] a = { 1, 2...

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...

布尔只有两种状态,所以直接用 OrderBy跟OrderByDescending就能正序跟倒序拍,没必要多计算 .OrderBy(o => o.字段); .OrderByDescending(o => o.字段); 比如 var p = new Dictionary(); p.Add(1, false); p.Add(2, false); p.Add(3, true); p.Ad...

List lists=new list();//省略添加数据 lists.OrderBy(a=>a.time) //time为object对象的一个属性。默认为升序 lists.OrderByDescending(a=>a.time)//降序 如果获得的是表的数据:db为dbml文件的对象 db.TiemTable.OrderBy(a=>a.time) //time为Ti...

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

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