c# - 使用 Entity Framework 5.0 进行数据注释（数据库优先）

Question

如果我使用实体框架（v5.0）数据库优先方法，使用数据注释进行验证的最佳方法是什么？

这是我由实体框架创建的部分类：

//------------------------------------------------------------------------------
// <auto-generated>
//    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.
// </auto-generated>
//------------------------------------------------------------------------------

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<float> MaintenancePercentage { get; set; }
        public Nullable<float> OfficePercentage { get; set; }
    }
}

我试过这个没有成功....

实体框架生成的文件：'PayrollMarkup_State.cs'

//------------------------------------------------------------------------------
// <auto-generated>
//    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.
// </auto-generated>
//------------------------------------------------------------------------------

using System.ComponentModel.DataAnnotations;

namespace ACore
{
    using System;
    using System.Collections.Generic;

    public partial class PayrollMarkup_State
    {
        public string State { get; set; }
        public Nullable<float> MaintenancePercentage { get; set; }
        public Nullable<float> 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来用作MetadataType模型类。

[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

您有一个命名空间问题 - 您定义了两个不同的 PayrollMarkup_State 类，一个在 ACore 命名空间下，一个在 ACore.Models 命名空间下。在包含元数据类型定义的文件中将命名空间更改为 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

我使用了两个额外的类：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; }

    }
}