在 asp.net Identity 中自定义 IdentityUser 类时会创建可空字段 [英] Nullable fields are created when customizing IdentityUser class in asp.net Identity

问题描述

我正在尝试在 asp.net 身份中自定义 IdentityUser 类.

I am trying to customize IdentityUser class in asp.net identity.

public class ApplicationUser : IdentityUser
{
    public ApplicationUser()
    {
        IsBlocked = false;
    }

    public bool IsBlocked { get; set; }
}

问题是:当使用代码优先迁移时，附加字段被创建为可空的.如果我删除数据库并重新创建它，也是如此.

The problem is: when using code first migrations, the additional field is created nullable. The same if I drop database and recreate it.

CREATE TABLE [dbo].[AspNetUsers] (
    [Id]            NVARCHAR (128) NOT NULL,
    [UserName]      NVARCHAR (MAX) NULL,
    [PasswordHash]  NVARCHAR (MAX) NULL,
    [SecurityStamp] NVARCHAR (MAX) NULL,
    [IsConfirmed]   BIT            NOT NULL,
    [IsBlocked]     BIT            NULL,
    [Discriminator] NVARCHAR (128) NOT NULL,
    CONSTRAINT [PK_dbo.AspNetUsers] PRIMARY KEY CLUSTERED ([Id] ASC)
);

我该如何解决这个问题?

How can I fix this?

我在同一个 DbContext 上的其他类中有布尔字段，并且它们都是创建的，而不是 null(应该如此).

I have boolean fields in other classes on the same DbContext, and they are all created not null (as they should).

推荐答案

下面的原始答案假设您有一个抽象基类，因此使用 TPC，如果您指定了 [Table]，则可能使用 TPT 属性，而不是 TPH.

The original answer, below, assumed you had an abstract base class, and therefore were using TPC, or possibly TPT if you specified the [Table] attribute on the concrete class, rather than TPH.

但是，如果您使用的是非抽象基类并且未在 ApplicationUser 上指定 [Table]，因此您的 ApplicationUser 和 IdentityUser 映射到单个表，那么您正在使用 TPH 方案.在这种情况下，子类中的任何字段在您的单个表中都可以为空.改变这种情况的唯一方法是切换到 TPC 或 TPT.

However, if you are using a non-abstract base class and do not specify a [Table] on your ApplicationUser, and therefore your ApplicationUser and IdentityUser map to a single table, then you are using the TPH scenario. In this scenario any fields from a subclass will be nullable in your single table. The only way to change this is to switch to TPC or TPT.

原答案

把 [必需] 属性上的属性:

Put the [Required] attribute on your property:

[Required]
public bool IsBlocked { get; set; }

然后，您的迁移应使其成为 NON NULL 列.

Your migration should then make it a NON NULL column.

但是，如果您的表中已经有数据，这将导致问题，因为它不知道要创建什么默认值.在这种情况下，我编辑迁移以首先使其成为 NULL 列，然后运行 ​​Sql命令设置我想要的值，然后AlterColumn 使其成为 NON NULL 列

However, if you already have data in your table this will cause issues as it won't know what default value to create. In this case I edit the migration to first make it a NULL column, then run a Sql command to set the values I want, and then AlterColumn make it a NON NULL column

AddColumn("dbo.MyTable", "MyColumn", c => c.Boolean());
Sql("UPDATE MyTable SET MyColumn = 1");
AlterColumn("dbo.MyTable", "MyColumn", c => c.Boolean(nullable: false));

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