数据注释与实体框架5.0（数据库第一） [英] Data Annotations with Entity Framework 5.0 (database first)

问题描述

如果我使用实体框架（v5.0）数据库的第一种方式，使用数据注释的最佳方式是什么？

What is the best way to use data annotations for validation if I'm using an Entity Framework (v5.0) database first approach?

这是我的部分实体框架创建的类：

This is my partial class created by Entity Framework:

//------------------------------------------------------------------------------
// <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; }
    }
}

我没有成功尝试过....

I tried this with no success....

实体框架生成的文件：'PayrollMarkup_State.cs'

Entity Framework generated file: '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'

I then created this file in a different directory: '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
    }
}

推荐答案

虽然有点痛苦，但您需要创建一个类作为 MetadataType 。

Although it's somewhat painful, you need to create a class to use as the MetadataType for your model class.

[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.
}

这篇关于数据注释与实体框架5.0（数据库第一）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！