将角色添加到 ASP.Net 标识时出错

Question

我的代码是这样的

    namespace DiagnosisApp.Models
{
    public class ApplicationUser : IdentityUser
    {
    }
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext()
            : base("DiagnosisContext")
        {
        }
    }
}
    namespace DiagnosisApp.DAL
{
    public class DiagnosisInitializer : DropCreateDatabaseIfModelChanges<DiagnosisContext>
    {
        protected override void Seed(DiagnosisContext context)
        {
            var userManager = new UserManager<ApplicationUser>(new
                UserStore<ApplicationUser>(context));
            var roleManager = new RoleManager<IdentityRole>(new
                RoleStore<IdentityRole>(context));
            string name = "Admin";
            string password = "123456";

            //Create Role Admin if it does not exist
            if (!roleManager.RoleExists(name))
            {
                IdentityResult roleresult = roleManager.Create(new IdentityRole(name));
            }
            //Create User=Admin with password=123456
            var user = new ApplicationUser();
            user.UserName = name;
            IdentityResult adminresult = userManager.Create(user, password);
            //Add User Admin to Role Admin
            if (adminresult.Succeeded)
            {
                IdentityResult result = userManager.AddToRole(user.Id, name);
            }
            base.Seed(context);
        }
    }
}
    namespace DiagnosisApp.DAL
{
    public class DiagnosisContext : DbContext
    {
        public DiagnosisContext()
            : base("DiagnosisContext")
        {
            Database.SetInitializer(new DiagnosisInitializer());
        }
    }
}

对我来说一切看起来都很好，但这会引发一个错误

实体类型 IdentityRole 不是当前上下文的模型的一部分。

在行

 if (!roleManager.RoleExists(name))

谁能指出我在这里做错了什么？

Answer 1

您的种子方法

protected override void Seed(DiagnosisContext context)

接受仅从原版 DbContext 继承的DiagnosisContext。你应该通过ApplicationDbContext

protected override void Seed(ApplicationDbContext context)

DbContext 上没有 IdentityRole。

Answer 2

检查诊断上下文类是否具有有效的签名，如下所示：

public class DiagnosisContext : IdentityDbContext<MyUser>

或

public class DiagnosisContext : IdentityDbContext