linq
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1. IList<city> cc = new List<city> { new city { Name = "100", DistanceFromSeattle = 10, Country = "中国" }, new city { Name = "10", DistanceFromSeattle = 20, Country = "美国" } };
GridView1.DataSource = from p in cc where p.DistanceFromSeattle>10 orderby p.DistanceFromSeattle descending select p; // aa.getData().Tables[0]; GridView1.DataBind(); 2. DataClasses1DataContext dc = new DataClasses1DataContext(); GridView1.DataSource = from p in dc.dnt_users where p.username.Length > 5 orderby p.username descending select p; GridView1.DataBind(); 或者 GridView1.DataSource = dc.dnt_users .Where(p=>p.username.Length > 5); GridView1.DataBind(); 表关联 GridView1.DataSource = from p in dc.dnt_helps join m in dc.dnt_postids on p.pid equals m.pid select new { p.message, p.id, p.title, m.postdatetime }; GridView1.DataBind(); 3. 存储过程EmployeeDataContext edc = new EmployeeDataContext(); string firstname = "alice"; string lastname = "wange"; this.GridView1.DataSource = edc.ProcInsertEmployee(lastname, firstname); //edc.ProcInsertEmployeeResult("alice", "wang"); this.GridView1.DataBind(); 4.添删改操作 DataClasses1DataContext dc = new DataClasses1DataContext(); 添加 dnt_help dp = new dnt_help(); //表dnt_help dp.title = "10"; dp.message = "中国"; dp.pid = 10; dp.orderby = 1; dc.dnt_helps.InsertOnSubmit(dp); //插入 dc.SubmitChanges(); //提交 BindAll(); //绑定函数 修改 var zz = from p in dc.dnt_helps where p.title == "10" select p; foreach (dnt_help dh in zz) { dh.title = "china"; } dc.SubmitChanges(); BindAll(); 删除 var zz = from p in dc.dnt_helps where p.title == "china" select p; if (zz.Count<dnt_help>() > 0) { dc.dnt_helps.DeleteOnSubmit(zz.First<dnt_help>()); （1） dc.SubmitChanges(); （2） BindAll(); } //批量删除需要自己做扩展，要么循环（1）+（2），还有就是做存储过程 |
