asp.net-core – 为什么这违反了类型参数’TUser’的约束？

public class User : IdentityUser<string,UserClaim,UserRole,UserLogin>
public class UserClaim : IdentityUserClaim<string>
public class UserLogin : IdentityUserLogin<string>
public class UserRole : IdentityUserRole<string>
public class UserToken : IdentityUserToken<string>
public class Role : IdentityRole<string,RoleClaim>
public class RoleClaim : IdentityRoleClaim<string>

然后我创建了一个DbContext类,如下所示

public class AppDbContext : IdentityDbContext<User,Role,string,UserLogin,RoleClaim,UserToken>

然后配置这些

services
    .AddIdentity<User,Role>()
    .AddEntityFrameworkStores<AppDbContext>()
    .AddDefaultTokenProviders();

但我也尝试过

.AddEntityFrameworkStores<AppDbContext,string>()

我在互联网上阅读了很多博客文章,例如this,但是大多数博客都要针对密钥的数据类型进行更改,比如int或Guid.在我的情况下,我不是从字符串更改默认键数据类型.

我在所有这些情况下编译都没问题,但它在运行时抛出错误

System.TypeLoadException
GenericArguments[0],’MyIdentity.Entities.User’,on
‘Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`8[TUser,TRole,TContext,TKey,TUserClaim,TUserRole,TUserLogin,TUserToken]’
violates the constraint of type parameter ‘TUser’.

at System.RuntimeTypeHandle.Instantiate(RuntimeTypeHandle handle,
IntPtr* pInst,int numGenericArgs,ObjectHandleOnStack type) at
System.RuntimeTypeHandle.Instantiate(Type[] inst) at
System.RuntimeType.MakeGenericType(Type[] instantiation)

如果我添加一个自定义的UserStore类,如this post中所述

public class UserStore : UserStore<User,AppDbContext,UserToken>

出现编译错误

CS0311 The type ‘MyIdentity.Entities.Role’ cannot be used as type
parameter ‘TRole’ in the generic type or method ‘UserStore’. There is no implicit reference conversion from
‘MyIdentity.Entities.Role’ to
‘Microsoft.AspNetCore.Identity.EntityFrameworkCore.IdentityRole>’

我做错了什么？