对类型“IAuthorizeData”的引用声称它在“Microsoft.AspNetCore.Authorization”中定义，但找不到答案

【问题标题】：Reference to type 'IAuthorizeData' claims it is defined in 'Microsoft.AspNetCore.Authorization', but it could not be found对类型“IAuthorizeData”的引用声称它在“Microsoft.AspNetCore.Authorization”中定义，但找不到
【发布时间】：2019-11-04 16:35:33
【问题描述】：

我有一个 Asp.Net Core 2.2 应用程序。当我迁移到 Asp.Net Core 3.0 时，出现以下错误：

对类型“IAuthorizeData”的引用声称它定义在 'Microsoft.AspNetCore.Authorization'，但找不到

我正在使用TagHelperSamples.Authorization nuget 包根据用户权限和角色选择性地呈现 HTML 部分。

如果用户被授权，我正在使用上述 nuget 包中的 asp-authorize 标签助手来显示菜单，如下所示：

<div asp-authorize class="collapse navbar-collapse" id="navbarCollapse">

这些标签助手在构建项目时产生错误。

我尝试在_ViewImports.cshtml 中添加@using Microsoft.AspNetCore.Authorization，但这不起作用。

关于如何解决此问题或任何解决方法的任何帮助/建议？

【问题讨论】：

您可能错过了一些也需要更新的 nuget 包。在从 2.2 迁移到 3 的过程中，有些东西被移动了，所以您要查找的类可能在其他地方。

标签： c# authorization asp.net-core-3.0 tag-helpers

【解决方案1】：

TagHelperSamples.Authorization 还不适合 asp.net core 3.0，参考

https://github.com/dpaquette/TagHelperSamples/issues/77

您可以删除包并在 asp.net core 3.0 项目中基于source code 手动创建您的授权标签帮助器类：

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Authorization.Policy;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Razor.TagHelpers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Asp3identityCore.TagHelpers
{
    [HtmlTargetElement(Attributes = "asp-authorize")]
    [HtmlTargetElement(Attributes = "asp-authorize,asp-policy")]
    [HtmlTargetElement(Attributes = "asp-authorize,asp-roles")]
    [HtmlTargetElement(Attributes = "asp-authorize,asp-authentication-schemes")]
    public class AuthorizationPolicyTagHelper : TagHelper, IAuthorizeData
    {
        private readonly IAuthorizationPolicyProvider _policyProvider;
        private readonly IPolicyEvaluator _policyEvaluator;
        private readonly IHttpContextAccessor _httpContextAccessor;

        public AuthorizationPolicyTagHelper(IHttpContextAccessor httpContextAccessor, IAuthorizationPolicyProvider policyProvider, IPolicyEvaluator policyEvaluator)
        {
            _httpContextAccessor = httpContextAccessor;
            _policyProvider = policyProvider;
            _policyEvaluator = policyEvaluator;
        }

        /// <summary>
        /// Gets or sets the policy name that determines access to the HTML block.
        /// </summary>
        [HtmlAttributeName("asp-policy")]
        public string Policy { get; set; }

        /// <summary>
        /// Gets or sets a comma delimited list of roles that are allowed to access the HTML  block.
        /// </summary>
        [HtmlAttributeName("asp-roles")]
        public string Roles { get; set; }

        /// <summary>
        /// Gets or sets a comma delimited list of schemes from which user information is constructed.
        /// </summary>
        [HtmlAttributeName("asp-authentication-schemes")]
        public string AuthenticationSchemes { get; set; }

        public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
        {
            var policy = await AuthorizationPolicy.CombineAsync(_policyProvider, new[] { this });

            var authenticateResult = await _policyEvaluator.AuthenticateAsync(policy, _httpContextAccessor.HttpContext);

            var authorizeResult = await _policyEvaluator.AuthorizeAsync(policy, authenticateResult, _httpContextAccessor.HttpContext, null);

            if (!authorizeResult.Succeeded)
            {
                output.SuppressOutput();
            }
        }
    }
}

【讨论】：

【解决方案2】：

我已更新 TagHelperSamples.Authorization 包以支持 ASP.NET Core 3.0。升级到最新的软件包版本将解决您的问题：https://www.nuget.org/packages/TagHelperSamples.Authorization/

【讨论】：