ASP.NET Core 3.1“‘用户’不包含‘FindFirstValue’的定义”

Question

在尝试从这里实现答案时> How to get the current logged in user Id in ASP.NET Core 用户将我重定向到这里 > https://github.com/dotnet/aspnetcore/issues/18348

var UserId = User.FindFirstValue(ClaimTypes.Name);

^ 这不起作用，并打印以下错误'User' does not contain a definition for 'FindFirstValue'

编辑：添加控制器 sn-p

我的控制器的完整 sn-p...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using ProjectName.Processing;
using ProjectName.Repository;
using Newtonsoft.Json;

namespace ProjectName.Controllers
{
    [ApiController]
    [Route("api/[controller]/[action]")]
    public class ClassNameController : ControllerBase
    {
        private readonly ILogger<ClassNameController> _logger;
        private OtherClassNameProcessing proc = new OtherClassNameProcessing();

        public ClassNameController(ILogger<ClassNameController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        [ProducesResponseType(typeof(List<2ndOtherClassNameRepository>), StatusCodes.Status200OK)]
        public IActionResult GetUserName()
        {
            var data = proc.GetUserName();
            return Ok(data.Result);
        }
    }
}

我的控制器正在调用的完整 sn-p...

using Microsoft.EntityFrameworkCore;
using ProjectName.Data;
using ProjectName.Repo;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//using System.Web;
using System.Threading.Tasks;
using System.Security.Claims;
using Microsoft.AspNetCore.Http;
using System.Web.Providers.Entities;

namespace ProjectName.Processing
{
    public class OtherClassNameProcessing
    {
        private readonly ProjName_DevelContext _context = new ProjName_DevelContext();
        private async Task<List<2ndOtherClassNameRepository>> GetNameFromRepo()
        {
            List<2ndOtherClassNameRepository> repoList = new List<2ndOtherClassNameRepository>();
            var Temp = await _context.tablename.ToListAsync();
            /* Working Test
            2ndOtherClassNameRepository repo = new 2ndOtherClassNameRepository();
            repo.UserName = "JohnDoe";
            repoList.Add(repo);
            return repoList;
            */
            2ndOtherClassNameRepository repo = new 2ndOtherClassNameRepository();
            // repo.UserName = "JohnDoe";
            var userId = User.FindFirstValue(ClaimTypes.Name);
            repo.UserName = userId;
            repoList.Add(repo);
            return repoList;
        }
        internal async Task<List<2ndOtherClassNameRepository>> GetUserName()
        {
            return await GetNameFromRepo();
        }
    }
}

知道为什么会出现此错误吗？

Answer 1

您可能遇到的问题是您缺少正确的软件包。

安装这个：Microsoft.Extensions.Identity.Core

一旦包含 using 语句，它就应该开始工作了。

Answer 2

好的！有问题。 User ClaimPrinciple 仅在 Controller 上下文中可用。我看到你的 ControllerNameProcessing 不是 Controller 类。所以你应该这样做：

public class ControllerNameProcessing
{
     private readonly IHttpContextAccessor _httpContextAccessor;

     public ControllerNameProcessing(IHttpContextAccessor httpContextAccessor)
     {
         _httpContextAccessor = httpContextAccessor;
     }

     private async Task<List<2ndClassNameRepository>> GetNameFromRepo()
     {
         // Omitted your other codes for brevity

         var userName = _httpContextAccessor.HttpContext.User.FindFirstValue(ClaimTypes.Name);

        // Omitted your other codes for brevity
     }
}

那么你应该在Startup类中注册IHttpContextAccessor，如下：

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpContextAccessor();
}

现在在您的控制器中：

[ApiController]
[Route("api/[controller]/[action]")]
public class ClassNameController : ControllerBase
{
    private readonly ILogger<ClassNameController> _logger;
    private OtherClassNameProcessing _otherClassNameProcessing;

    public ClassNameController(ILogger<ClassNameController> logger, OtherClassNameProcessing otherClassNameProcessing)
    {
        _logger = logger;
        _otherClassNameProcessing = otherClassNameProcessing;
    }

    [HttpGet]
    [ProducesResponseType(typeof(List<2ndOtherClassNameRepository>), StatusCodes.Status200OK)]
    public IActionResult GetUserName()
    {
        var data = proc.GetUserName();
        return Ok(data.Result);
    }
}

那么你应该在Startup类中注册OtherClassNameProcessing，如下：

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpContextAccessor();
    services.AddScoped<OtherClassNameProcessing>();
}

Answer 3

尝试按如下方式获取用户 ID（对于 ClaimsPrincipal 类型的用户）

 var userId = User.Claims.Where(c => c.Type == "sub").FirstOrDefault().Value;

对于 System.Web.Providers.Entities.User 类型的用户使用

User.UserId

https://docs.microsoft.com/en-us/previous-versions/aspnet/dn253175(v=vs.108)