如何在实体框架中进行实体键映射，如sql的外键？

Question

我尝试在我的实体应用程序上提供实体地图。但是我该怎么做呢？我试着让它像下面这样：

var test = ( from k in Kartlar where k.Rehber.....

上面的代码 k.（看不到 Rehber 或不工作）如果你是正确的，我可以写 k.Rehber.ID 和其他。我不会写：

from
 k in
 Kartlar
where
k.Rehber.ID = 123 //assuming that navigation property name is Rehbar and its primary key of Rehbar table is ID
&& k.Kampanya.ID = 345 //assuming that navigation property name is Kampanya and its primary             //key of Kampanya table is ID
&& k.Birim.ID = 567 //assuming that navigation property name is Birim and its primary key of Birim table is ID
select
k

你可以看到的图片：alt text http://img695.imageshack.us/img695/9334/test1f.png

另外：你应该看看：http://i42.tinypic.com/2nqyyc6.png

我有一个表，它包含 3 个这样的外键字段：

我的桌子：Kartlar

• ID (Pkey)
• RehberID (Fkey)
• KampanyaID (Fkey)
• BrimID (Fkey)
• 姓名
• 详情

如何使用 LINQ 编写实体查询？

select * from Kartlar where RehberID=123 and KampanyaID=345 and BrimID=567

但请注意，我在实体中看不到 RehberID、KampanyaID、BrimID，它们是外键。我应该使用实体键，但如何使用？

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data;
using System.Data.Objects;
using System.Data.Objects.DataClasses;
using System.Web.UI.MobileControls;


namespace EfEntity
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)<br>
            {
                gwKampanya.DataSource = Kart(297688, 88689, 68686);
                gwKampanya.DataBind();
            }
        }

        public List<Kartlar> Kart(int RehberID, int KampanyaID, int BrimID)
        {
            List<Kartlar> kartlar;
            using (xyzEntities genSatisctx = new xyzEntities())
            {
                kartlar = (from k in genSatisctx.Kartlar
                           where k.Rehber.ID == RehberID &&
                                 k.Kampanya.ID == KampanyaID &&
                                 k.Birim.ID == BrimID
                           select k).ToList();

                return kartlar;

            }
        }
    }


}