覆盖实体框架实体属性 [英] Override Entity Framework Entity Property

问题描述

我在EF名为档案的实体，我想数据注解属性添加到该实体的名字属性，因此我创造了像这样一个新的部分类;

I have an entity in EF named Profile and I would like to add data annotation attributes to the "FirstName" property of this entity so I created a new partial class like so;

public partial class Profile : EntityObject
{
    [Required]
    [Display(Name = "First Name")]
    [EdmScalarPropertyAttribute(EntityKeyProperty = false, IsNullable = false)]
    [DataMemberAttribute()]
    override public global::System.String FirstName
    {
        get
        {
            return _FirstName;
        }
        set
        {
            OnFirstNameChanging(value);
            ReportPropertyChanging("FirstName");
            _FirstName = StructuralObject.SetValidValue(value, false);
            ReportPropertyChanged("FirstName");
            OnFirstNameChanged();
        }
    }
}

但我得到这个;

But I am getting this;

The type 'CC.Models.Profile' already contains a definition for 'FirstName'

任何想法？

问候，

瑞安

推荐答案

您可惜不能像改变它。你必须创建元数据类，并添加元数据属性的类。见下面的链接：

You unfortunately can't change it like that. You have to create a metadata class and add the metadata attributes to that class. See below link:

<一个href=\"http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.metadatatypeattribute.aspx\">http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.metadatatypeattribute.aspx

看一看此的链接，看到生成的元数据类的一些问题，我通常做的是，如果我改变的东西我只是通过添加新服务，之后删除该服务，然后合并这两个让我的老的变化，并保持新添加的实体再生metadataclass。

Have a look at this link to see some issues with generating a metadata class, what I normally do is if I change something I just regenerate the metadataclass by adding a new service and deleting the service afterwards and then merge the two keeping my old changes and keeping the newly added entities.

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