InvalidOperationException：无法为“角色”创建DbSet，因为此类型不包含在上下文模型中 [英] InvalidOperationException: Cannot create a DbSet for 'Role' because this type is not included in the model for the context

问题描述

以下解决方案在.net core 1.1中有效，但是从1.1升级到2.0后，我收到以下错误：

The following solution works in .net core 1.1, but after upgrading from 1.1 to 2.0, I received the following error:

InvalidOperationException ：无法为角色创建DbSet，因为此类型不包含在上下文模型中。

InvalidOperationException: Cannot create a DbSet for 'Role' because this type is not included in the model for the context.

当用户尝试执行以下操作时：登录并执行以下语句：

When the user attempts to log in and the following statement is executed:

var result = await _signInManager.PasswordSignInAsync(model.Email, 
                                model.Password, model.RememberMe, lockoutOnFailure: false);

出什么问题了？

User.cs

public partial class User : IdentityUser<Guid>
{
    public string Name { get; set; }
}

IdentityEntities.cs

public partial class UserLogin : IdentityUserLogin<Guid>
{
}
public partial class UserRole : IdentityUserRole<Guid>
{
}
public partial class UserClaim : IdentityUserClaim<Guid>
{
}
public partial class Role : IdentityRole<Guid>
{
    public Role() : base()
    { 
    }

    public Role(string roleName)
    {
        Name = roleName;
    }
}
public partial class RoleClaim : IdentityRoleClaim<Guid>
{
}
public partial class UserToken : IdentityUserToken<Guid>
{
}

ConfigureServices

services.AddIdentity<User, Role> 

推荐答案

添加并成功了：

builder.Entity<IdentityUserRole<Guid>>().HasKey(p => new { p.UserId, p.RoleId });

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