没有给定的参数对应于 'IOwinContext.Get<T>(string)' 的所需形式参数 'key'

Question

我正在尝试向我的项目添加个人资料图片并且我正在关注这篇文章 https://social.technet.microsoft.com/wiki/contents/articles/34445.mvc-asp-net-identity-customizing-for-adding-profile-image.aspx#Step_4_IdentityModels_cs 在文章中有一部分我必须获取用户详细信息才能加载用户图像。在这一步我得到了标题中的错误，我错过了什么？

    public FileContentResult UserPhoto()
    {
        if (User.Identity.IsAuthenticated)
        {
            String userId = User.Identity.GetUserId();
            if (userId == null)
            {
                string filename = 
  HttpContext.Server.MapPath(@"~/Uploads/ProfilePictures/blankprofile.png");
                byte[] imageData = null;
                FileInfo fileInfo = new FileInfo(filename);
                long imageFileLength = fileInfo.Length;
                FileStream fs = new FileStream(filename, FileMode.Open, 
                FileAccess.Read);
                BinaryReader br = new BinaryReader(fs);
                imageData = br.ReadBytes((int)imageFileLength);
                return File(imageData, "image/png");
            }
            // to get the user details to load user Image
            var bdUsers = 
            HttpContext.GetOwinContext().Get<ApplicationDbContext>();
            var userImage = bdUsers.Users.Where(x => x.Id == 
            userId).FirstOrDefault();
            return new FileContentResult(userImage.ProfilePicture, 
            "image/jpeg");
        }
        else
        {
            string fileName      =HttpContext.Server.MapPath(@"~/Uploads/ProfilePictures/blankprofile.png");

            byte[] imageData = null;
            FileInfo fileInfo = new FileInfo(fileName);
            long imageFileLength = fileInfo.Length;
            FileStream fs = new FileStream(fileName, FileMode.Open, 
            FileAccess.Read);
            BinaryReader br = new BinaryReader(fs);
            imageData = br.ReadBytes((int)imageFileLength);
            return File(imageData, "image/png");             
        }

    }

Answer 1

您必须引用 Microsoft.AspNet.Identity.Owin 命名空间。它具有 class，其中包含您正在寻找的 Get 方法。

没有给定的参数对应于 'IOwinContext.Get<T>(string)' 的所需形式参数 'key'

There is no argument given that corresponds to the required formal parameter 'key' of 'IOwinContext.Get<T>(string)'

asp.net-mvc

owin