使用Entity Framework 5.0进行数据注释（数据库优先）

如果我使用entity framework（v5.0）数据库第一种方法，那么使用数据注释进行validation的最佳方法是什么？

这是我的Entity Framework创建的部分类：

//------------------------------------------------------------------------------ //  // This code was generated from a template. // // Manual changes to this file may cause unexpected behavior in your application. // Manual changes to this file will be overwritten if the code is regenerated. //  //------------------------------------------------------------------------------ using System.ComponentModel.DataAnnotations; namespace ACore { using System; using System.Collections.Generic; public partial class PayrollMarkup_State { [UIHint("StatesEditor")] // <-- I added this line but it will be overwritten public string State { get; set; } public Nullable MaintenancePercentage { get; set; } public Nullable OfficePercentage { get; set; } } } 

我试过这个没有成功……

entity framework生成的文件：’PayrollMarkup_State.cs’

 //------------------------------------------------------------------------------ //  // This code was generated from a template. // // Manual changes to this file may cause unexpected behavior in your application. // Manual changes to this file will be overwritten if the code is regenerated. //  //------------------------------------------------------------------------------ using System.ComponentModel.DataAnnotations; namespace ACore { using System; using System.Collections.Generic; public partial class PayrollMarkup_State { public string State { get; set; } public Nullable MaintenancePercentage { get; set; } public Nullable OfficePercentage { get; set; } } } 

然后我在另一个目录中创建了这个文件：’PayrollMarkup_state.cs’

 using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.Linq; using System.Web; namespace ACore.Models { [MetadataType(typeof(PayrollMarkupMetadata))] public partial class PayrollMarkup_State { } public class PayrollMarkupMetadata { [UIHint("StatesEditor")] public string State; // Has to have the same type and name as your model } } 

Answer 1

虽然有点痛苦，但您需要创建一个类作为模型类的MetadataType 。

 [MetadataType(typeof(PayrollMarkupMetadata)) public partial class PayrollMarkup_State { ... } public class PayrollMarkupMetadata { [UIHint("StatesEditor")] public string State; // Has to have the same type and name as your model // etc. } 

Answer 2

您有一个名称空间问题 – 您已经定义了两个不同的PayrollMarkup_State类，一个在ACore名称空间下，另一个在ACore.Models名称空间下。 在包含元数据类型定义的文件中将名称空间更改为ACore（来自ACore.Models）。

Answer 3

您可以使用部分元数据类

http://www.asp.net/mvc/overview/getting-started/database-first-development/enhancing-data-validation

Answer 4

我使用了另外两个类：Map和Meta，这是我的地图：

 namespace Whatever.Models { [MetadataType(typeof(ThisMeta))] public partial class This { } } 

现在这里是元类：

 using System.ComponentModel; using System.ComponentModel.DataAnnotations; namespace Whatever.Models { public class ThisMeta { [DisplayName("")] public int UID { get; set; } } }