ASP.NET MVC3 System.ComponentModel.DataAnnotations和Association

Question

這部分代碼工作正常

[Association(Storage = "profile", ThisKey = "UserId", OtherKey = "UserId")]
public Profile User {
   get { return this.profile.Entity; }
   set { this.profile.Entity = value; }
}

但如果我加入這個課程

System.ComponentModel.DataAnnotations 

然后，無法找到協會。

問題出在哪兒 ？

Answer 1

看起來你有兩個沖突的命名空間。 嘗試將Association更改為System.Data.Linq.Mapping.Association，因此它看起來像：

[System.Data.Linq.Mapping.Association(Storage = "profile", ThisKey = "UserId", OtherKey = "UserId")]
public Profile User {
   get { return this.profile.Entity; }
   set { this.profile.Entity = value; }
}

Answer 2

對Austin的回答的一個改進是使用using語句：

using L2SAssociation = System.Data.Linq.Mapping.Association;

[L2SAssociation(Storage = "profile", ThisKey = "UserId", OtherKey = "UserId")]
public Profile User
{
   get { return this.profile.Entity; }
   set { this.profile.Entity = value; }
}