MVC+Linq+EF

using (DataContext ctx = new DataContext())
{
/*foreach (var item in ctx.employees)
{
ViewData["Name"] = item.Name;
}
*/
//------------------------------------------
/*var employees = from emp in ctx.employees
where emp => emp.Age == 22 && emp.ID == "123456781"
select emp;
//上边转化
var employees = ctx.employees.Where(emp => emp.Age == 22 && emp.ID == "123456781");
foreach (var item in employees)
{
ViewData["Name"] = item.Name;
}--------------------------------------------*/
/*---------------------------------------
* var employees = from emp in ctx.employees
where emp.Age == 22 && emp.ID == "123456781"
select emp.Name;//查询单个字段
*/
var employees = ctx.employees.Where(emp => emp.Age == 22 && emp.ID == "123456781")
.OrderBy(emp => emp.ID)
.Select(emp => emp.Name);//查询单个字段
//---------------------------------------------------
/*
var employees2 = from emp in ctx.employees
where emp.Age == 21
select new { emp.Age, emp.Name };//查询多个字段*/
var employees2 = ctx.employees.Where(emp => emp.Age == 21)
.OrderBy(emp => emp.Age)
.Select(emp => new { emp.Name, emp.Age });//查询多个字段*/
//----------------------------------------------
//不管怎样都要用foreach、
foreach (var item in employees)
{
ViewData["single"] = item;//因为它查出来是单个字段，所以直接输出,不用点了
}
foreach (var item in employees2)
{
ViewData["doubleAge"] = item.Age;
ViewData["doubleName"] = item.Name;//他很智能的。
}
return View();
}