＆＃39; System.Web.HttpContext＆＃39;不包含＆＃39; GetOwinContext＆＃39;的定义

Question

我有以下错误：＆＃39; System.Web.HttpContext＆＃39;不包含＆＃39; GetOwinContext＆＃39;的定义 每当我调试我的项目。这个错误出现在Web API页面中，虽然它没有在默认的AccounController.cs中显示错误并且安装了nuget包。缺少什么？

using IdentitySample.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin.Security;
using System.Web;
using System.Threading.Tasks;
using task.Models;
using System.Globalization;
public ApplicationUserManager UserManager
    {
        get
        {
            return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();

        }
        private set
        {
            _userManager = value;
        }
    }

Answer 1

好的我找到了解决方案，因为我已经安装了nuget包，我所要做的就是以下内容：

  return _userManager ?? HttpContext.**current**.GetOwinContext().GetUserManager<ApplicationUserManager>();