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C# linq 查询

有编译还是运行错误吗

试试这个 from item in a join b in a on a.name equals b.bname where b.bcar="abc" select new 类{ ..... }

var data=from a in Table1 join b in Table2 on a.Num=b.Num where a.typeid==b.id select new {Name=a.Name,Score =a.Score ,Num =a.num,Address =b.Address };

string[] ids = (from DeductionBill in t_ds_DeductionBill where t_ds_DeductionBill .BillNumber.Equals(c.BillNumber)) .ToArray(); TotalWeight= (from Order in t_kd_Order where(item => ids.Contains(item.OrderID)) select Order.Total...

var a =from c in TongXunLu selectc.classId,count(c.classid) as sum grounp by c.classid foreach(var item in a) { console.writeline(item); }

普通的查询,就写like语句就可以了。 linq就看这个:http://jingyan.baidu.com/article/8065f87f83b05123312498e2.html

1. 可以用查询结果的 ToList()方法 2. 示例代码如下: using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2{ class Program { static void Main(string[] args) { int[] arr = { ...

具体方法如下: 匿名类型的传递 static void Main(string[] args) { var User = GetAnonymous().Cast(new { UserName = "", LastLoginIp = "" }); Console.Write(User.UserName); } static object GetAnonymous() { var User = new { UserName =...

表用数组来表示的 private void button1_Click(object sender, EventArgs e) { var a = new[] { new{ id=1,name="测试"}, new {id=2,name="测试123"} }; var b = new[] { new { id = 1, aid = 1, status_id = 1 }, new { id = 2, aid = 2, stat...

我想要结果查得的CategoryID是CategoryName要怎么写这个语句 这句话什么意思。 查找 CategoryName where CategoryID=@CategoryID 可以写成 var temp=from i in Category where i.CategoryID=@CategoryID select i. CategoryName .

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