如何从Asp.Net核心身份验证中获取策略列表？

在我的startup.cs文件中,我已经配置了我需要的各种策略：

public void ConfigureServices(IServiceCollection services)
{
        servizi.AddAuthorization(options =>
        {
            options.AddPolicy("Insert",policyBuilder => policyBuilder .RequireClaim("AllowInsert"));
            options.AddPolicy("Update",policyBuilder => policyBuilder .RequireClaim("AllowUpdate"));
            options.AddPolicy("Delete",policyBuilder => policyBuilder .RequireClaim("AllowDelete"));
        });
}

然后在控制器中,我已将声明分配给角色(管理员角色)：

public async Task<IActionResult> AssignClaimstoAdminRole()
    {
        await _roleManager.AddClaimAsync(await _roleManager.FindByNameAsync("Administrator"),new Claim("AllowInsert","true"));
        await _roleManager.AddClaimAsync(await _roleManager.FindByNameAsync("Administrator"),new Claim("AllowUpdate",new Claim("AllowDelete","true"));

        await _loginManager.RefreshSignInAsync(await _userManager.FindByNameAsync(User.Identity.Name));
        return RedirectToAction("SomeAction","MyController");
    }

最后我保护了我注入授权服务的观点：

@using Microsoft.AspNetCore.Authorization
@inject IAuthorizationService AuthorizationService

@if (await AuthorizationService.AuthorizeAsync(User,"Insert"))
{
     <i role="submit" class="fa fa-floppy-o fa-2x"></i>
}

我的问题是：
我想检索在startup.cs中创建的策略列表,这样我最终可以构建一个页面来添加其他用户/角色,为它们分配一个或多个已存在于系统中的策略.

是否有一个对象暴露了以前添加的策略的集合？
提前致谢！