AuthorizeFilter 添加 AuthorizationPolicy 的代码如下:
services.AddMvc(o =>
    {        var policy = new AuthorizationPolicyBuilder()
            .RequireRole(ROLE_NAME)
            .Build();
        o.Filters.Add(new AuthorizeFilter(policy));
    });请问如何通过 IAuthorizationPolicyProvider 接口获取上面添加的 AuthorizationPolicy ?
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