EF代碼優先5.0.rc遷移不`噸更新標識屬性

說，我們使用EF代碼首先，我們有這個簡單的模型：EF代碼優先5.0.rc遷移不`噸更新標識屬性

using System; 
using System.Collections.Generic; 
using System.ComponentModel.DataAnnotations; 
using System.Data.Entity; 
using System.Linq; 
using System.Web; 

namespace EFCodeFirstIdentityProblem.Models 
{ 
    public class CAddress 
    { 
     public int ID { get; set; } 

     public string Street { get; set; } 
     public string Building { get; set; } 

     public virtual CUser User { get; set; } 
    } 

    public class CUser 
    { 
     public int ID { get; set; } 

     public string Name { get; set; } 
     public string Age { get; set; } 

     [Required] 
     public virtual CAddress Address { get; set; } 
    } 

    public class MyContext : DbContext 
    { 
     public DbSet<CAddress> Addresses { get; set; } 
     public DbSet<CUser> Users { get; set; } 
    } 
}

這樣，CAddress將本金結束這個1：0..1的關係。接下來我們添加連接字符串到Web.Config（我使用MSSQL 2008 R2），使一個使用這個模型的控制器運行。 EF代碼首先爲我們創建表的預期：

enter image description here

那麼，假設我們犯了一個錯誤，而事實上，我們希望CUser是這一主要結束0..1：1的關係。因此，我們做出改變：

 ... 
     [Required] 
     public virtual CUser User { get; set; } 
     ... 

     ... 
     public virtual CAddress Address { get; set; } 
     ...

建造，然後在包管理器控制檯運行，並添加一些遷移：

PM> Enable-Migrations 
Checking if the context targets an existing database... 
Detected database created with a database initializer. Scaffolded migration '201208021053489_InitialCreate' corresponding to existing database. To use an automatic migration instead, delete the Migrations folder and re-run Enable-Migrations specifying the -EnableAutomaticMigrations parameter. 
Code First Migrations enabled for project EFCodeFirstIdentityProblem. 
PM> Add-Migration ChangeDependency 
Scaffolding migration 'ChangeDependency'. 
The Designer Code for this migration file includes a snapshot of your current Code First model. This snapshot is used to calculate the changes to your model when you scaffold the next migration. If you make additional changes to your model that you want to include in this migration, then you can re-scaffold it by running 'Add-Migration 201208021157341_ChangeDependency' again. 
PM>

這裏什麼we`ve被賦予了「ChangeDependency」遷移：

namespace EFCodeFirstIdentityProblem.Migrations 
{ 
    using System; 
    using System.Data.Entity.Migrations; 

    public partial class ChangeDependency : DbMigration 
    { 
     public override void Up() 
     { 
      DropForeignKey("dbo.CUsers", "ID", "dbo.CAddresses"); 
      DropIndex("dbo.CUsers", new[] { "ID" }); 
      AlterColumn("dbo.CAddresses", "ID", c => c.Int(nullable: false)); 
      AlterColumn("dbo.CUsers", "ID", c => c.Int(nullable: false, identity: true)); //identity: true - this is important 
      AddForeignKey("dbo.CAddresses", "ID", "dbo.CUsers", "ID"); 
      CreateIndex("dbo.CAddresses", "ID"); 
     } 

     public override void Down() 
     { 
      DropIndex("dbo.CAddresses", new[] { "ID" }); 
      DropForeignKey("dbo.CAddresses", "ID", "dbo.CUsers"); 
      AlterColumn("dbo.CUsers", "ID", c => c.Int(nullable: false)); 
      AlterColumn("dbo.CAddresses", "ID", c => c.Int(nullable: false, identity: true)); 
      CreateIndex("dbo.CUsers", "ID"); 
      AddForeignKey("dbo.CUsers", "ID", "dbo.CAddresses", "ID"); 
     } 
    } 
}

Import and part is：

AlterColumn（「dbo.CUsers」，「ID」，c => c.Int（nullable：false，identity：true））;

因此，CUsers.ID現在必須成爲DB中的標識。讓我們犯這個更改爲DB：

PM> 
PM> Update-Database -Verbose 
Using StartUp project 'EFCodeFirstIdentityProblem'. 
Using NuGet project 'EFCodeFirstIdentityProblem'. 
Specify the '-Verbose' flag to view the SQL statements being applied to the target database. 
Target database is: 'EFTest' (DataSource: (local), Provider: System.Data.SqlClient, Origin: Configuration). 
Applying code-based migrations: [201208021157341_ChangeDependency]. 
Applying code-based migration: 201208021157341_ChangeDependency. 
ALTER TABLE [dbo].[CUsers] DROP CONSTRAINT [FK_dbo.CUsers_dbo.CAddresses_ID] 
DROP INDEX [IX_ID] ON [dbo].[CUsers] 
ALTER TABLE [dbo].[CAddresses] ALTER COLUMN [ID] [int] NOT NULL 
ALTER TABLE [dbo].[CUsers] ALTER COLUMN [ID] [int] NOT NULL 
ALTER TABLE [dbo].[CAddresses] ADD CONSTRAINT [FK_dbo.CAddresses_dbo.CUsers_ID] FOREIGN KEY ([ID]) REFERENCES [dbo].[CUsers] ([ID]) 
CREATE INDEX [IX_ID] ON [dbo].[CAddresses]([ID]) 
[Inserting migration history record] 
Running Seed method. 
PM>

有通過成爲標識列在DB CUsers.ID的遷移沒有給出SQL指令。所以，因爲這存在一個問題：

（更新數據庫） enter image description here