小编moh*_*mad的帖子

我有以下错误:每当我调试我的项目时,'System.Web.HttpContext'都不包含'GetOwinContext'的定义.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;
        }
    }