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C linq whErE in

LINQ 比如说 List list = new List(); var q = from String s in list where s[0] = "A" && s.Length = 4 //字符串是...

List arr = new List(); arr.Add(1);arr.Add(2); query.Where(c => arr.Contains(c .UserID));

你说的 from c 和select c 其实是一个特列 你要查询的数据 正好是 list 表中的一个完整的对象 比如 C 有两个字段 A B 可以有 from c in list where c.ParentID == ROOTID orderby c.Priority select new { A = c.A } 这样就类似于数据库sql 的部...

select new 出来的是一个匿名对象,也就是包含c.ContactName跟o.OrderID这两个字段的对象。 如果你直接select c,只能选择Customers 中的字段,无法提取Orders 中的,而你的查询结果要求同时提取Customer的ContactName跟Order的OrderID 。

SQL:select * from A,B where A.cpID=B.cpID and A.cbID=B.cbID LINQ:var p = from t1 in a from t2 in b from t3 in c where t1.cpid equal t2.cpid and t1.cbid equal t3.cbid select new { t1, t2.cpid }

var testcase =(from c in men.testcase where c.planid==planId orderbyDescing c.caseset_loop select c).FirstOrDefault() ;

query = from c in tbs where != "类别" && c.path_tbname.Contains(tName.Text) orderby select c; Contains 等于 like '%'+tName.Text+'%'

public List GetList() var query = from c in context.Sys_VehicleManage select new Sys_VehicleManage { VehicleID = c.VehicleID, VehicleNumber = c.VehicleNumber }; return query.Where(p=>p.VehicleID==1).ToList(); try it

IQueryable result = from c in db.GetTable() join t in db.GetTable() on new { id = c.ID, id1 = c.ID } equals new { id = t.ClassID, id1 = id } select new ClassInformation { ID = c.ID, ClassID = t.ClassID, Name = c.Name, TeacherNa...

SumA = (from c in vSession.Linq() select c.a).Sum(); CountB = (from c in vSession.Linq() select c.b).Count(); ------解决方案-------------------- C# code//更改成这种形式 var query = from w in data.News select new { sum=data.News...

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