实体框架代码优先 - 忽略基类

Question

我有一个模型如下:

public class User : System.Web.Security.MembershipUser
{
public int UserId { get; set; }
    public string SomeProperty { get; set; }
}

生成数据库时,我希望实体框架忽略MembershipUser,只生成一个名为User的表,其中包含User类中的两个属性.我试过以下无济于事.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Ignore<System.Web.Security.MembershipUser>();
}

Answer 1

有两种选择.一种是通过调用Ignore每个属性来忽略所有基类属性.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<User>().Ignore(u => u.ProviderUserKey);
    modelBuilder.Entity<User>().Ignore(u => u.LastActivityDate);
    // and so on for all base class properties
}

其他选项是使用合成来MembershipUser从您的User类中检索实例.这里的User类不是继承自的MembershipUser.

public class User
{
    public int UserId { get; set; }
    public string SomeProperty { get; set; }

    public MembershipUser MembershipUser
    {
        get
        {
            // create an instance using the available properties and return
        }
    }
}

并映射如下

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<User>().Ignore(u => u.MembershipUser);
    modelBuilder.Ignore<System.Web.Security.MembershipUser>();

}

Answer 2

NotMappedAttribute属性是你的朋友：

[MetadataType(typeof(UserMd)]
public class User : System.Web.Security.MembershipUser
{
    ////read description bellow code
    //static User()
    //{
    //  var type = typeof(User);
    //  TypeDescriptor.AddProviderTransparent(
    //    new AssociatedMetadataTypeTypeDescriptionProvider(type), type);
    //}        

    public int UserId { get; set; }
    public string SomeProperty { get; set; }

    internal class UserMd
    {
        [NotMapped]
        public string UserName { get; set; }
    }
}

我不确定代码是否首先自行自动处理元数据，请尝试上述方法，如果不起作用，请手动附加元数据（即取消注释注释行）。

更新 我确实更喜欢上面的解决方案，但如果它对您来说太冗长，请使用以下StructuralTypeConfiguration<TStructuralType>.Ignore<TProperty> Method方法：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    var config = modelBuilder.Entity<User>();
    config.Ignore(u => u.UserName);
}