Question

我正在使用带有Asp.net Identity的MVC6项目，并希望将ID列从字符串更改为INT。我关注了这篇文章enter link description here

我收到一条错误，说可以在Role和User的ID列中插入一个null，但是如果我恢复到它可以正常工作的那么。

public class ApplicationUser : IdentityUser<int>
{
}
public class ApplicationRole : IdentityRole<int>
{
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, int>
{
    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        // Customize the ASP.NET Identity model and override the defaults if needed.
        // For example, you can rename the ASP.NET Identity table names and more.
        // Add your customizations after calling base.OnModelCreating(builder);
    }

    public DbSet<PropertyManagementCompany> PMC { get; set; }
}

Answer 1

以下是如何在Identity上使用整数列，Asp NET Core＆amp;实体框架核心：

public class User : IdentityUser<int>
{
}

public class Role : IdentityRole<int>
{
}

public class AppDbContext : IdentityDbContext<User, Role, int>
{
    public AppDbContext(DbContextOptions options) : base(options) {}
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddIdentity<User, Role>(options => {
            // ...
        }).AddEntityFrameworkStores<AppDbContext, int>(); // NOTE this line
    }
}

如果您遇到奇怪的运行时错误：

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: GenericArguments[0], '...Models.User', on 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`3[TUser,TRole,TContext]' violates the constraint of type 'TUser'. ---> System.TypeLoadException: GenericArguments[0], '...Models.User', on 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`4[TUser,TRole,TContext,TKey]' violates the constraint of type parameter 'TUser'.

这意味着您忘记在AddEntityFrameworkStores<AppDbContext, int>()上添加TKey。

Answer 2

我之前为MVC5做过的就是我实际做过的事情

#region Entities

public class ApplicationUserClaim : IdentityUserClaim<Int32> { }
public class ApplicationUserRole : IdentityUserRole<Int32> { }
public class ApplicationUserLogin : IdentityUserLogin<Int32> { }
public class ApplicationRole : IdentityRole<Int32, ApplicationUserRole> { }
public class ApplicationUser : IdentityUser<Int32, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>, IUser<Int32> { }
public class ApplicationClaimsPrincipal : ClaimsPrincipal
{
    public ApplicationClaimsPrincipal(ClaimsPrincipal claimsPrincipal) : base(claimsPrincipal) { }
    public Int32 UserId { get { return Int32.Parse(this.FindFirst(ClaimTypes.Sid).Value); } }
}

#endregion

#region Stores

public class ApplicationUserStore : UserStore<ApplicationUser, ApplicationRole, Int32, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>
{
    public ApplicationUserStore() : base(new CustomsSiteDbContext()) { }
    public ApplicationUserStore(CustomsSiteDbContext context) : base(context) { }
}
public class ApplicationRoleStore : RoleStore<ApplicationRole, Int32, ApplicationUserRole>
{
    public ApplicationRoleStore() : base(new CustomsSiteDbContext()) { }
    public ApplicationRoleStore(CustomsSiteDbContext context) : base(context) { }
}

#endregion

#region Managers

public class ApplicationUserManager : UserManager<ApplicationUser, Int32>
{
    public ApplicationUserManager() : base(new ApplicationUserStore()) { }
    public ApplicationUserManager(ApplicationUserStore userStore) : base(userStore) { }
}
public class ApplicationRoleManager : RoleManager<ApplicationRole, Int32>
{
    public ApplicationRoleManager() : base(new ApplicationRoleStore()) { }
    public ApplicationRoleManager(ApplicationRoleStore roleStore) : base(roleStore) { }
}

#endregion

我希望这会有所帮助

Answer 3

我发现了这个问题。它与迁移有关。当VS2015首次从模板创建项目时，它已经作为迁移构建，并将列作为字符串，即使我在原始帖子中将代码更改为INT。所以你需要做的是以下

删除迁移和ASP.Net标识数据库表
删除项目中“迁移”文件夹中的文件
运行新的迁移命令“dnx ef migrations add”
下次尝试访问Identity时，它将使用正确的PK类型

具有INT id列的ASP.Net标识到MVC 6

3 个答案: