“HttpRequest”不包含“Url”的定义

Question

public IActionResult Register(SysUser usr)
    {
        if (!ModelState.IsValid)
        {
            ViewData["Message"] = "Invalid Input";
            ViewData["MsgType"] = "warning";
            return View("UserRegister");
        }
        else
        {
            string insert =
               @"INSERT INTO SysUser (UserId, UserPw, FullName, Email, CorporateId, UserRole) VALUES
             ('{0}', HASHBYTES('SHA1', '{1}'), '{2}', '{3}', {4}, 'user')";
            if (DBUtl.ExecSQL(insert, usr.UserId, usr.UserPw, usr.FullName, usr.Email) == 1)
            {
                usr.ActivationToken = Guid.NewGuid().ToString();
                if (usr.ActivationToken != null)
                {
                    string inst = @"INSERT INTO SysUser(Active)VALUES('1')";
                    if (DBUtl.ExecSQL(inst, usr.Active) == 1)
                    {



                        string template = @"Hi {0},<br/><br/>
                           you have successfully created an account at Parkway Pantai Health Screening Portal.
Please click on the link below to verify your email address and complete your registration. Your user id is <b>{1}</b> and password is <b>{2}</b>.
                           <br/>";

                        template+= "</br><a href= '" + Request.Url.AbsoluteUri.Replace("CS.aspx", "CS_Activation.aspx?ActivationToken"+ usr.ActivationToken
                            ) + "'>Click here to activate your account.</a>";


                        string title = "Registration Successul - Welcome";
                        string message = String.Format(template, usr.FullName, usr.UserId, usr.UserPw);
                        string result = "";

                        bool outcome = false;
                        // TODO: L10 Task 2b - Call EmailUtl.SendEmail to send email
                        //                     Uncomment the following line with you are done
                        outcome = EmailUtl.SendEmail(usr.Email, title, message, out result);
                        if (outcome)
                        {
                            ViewData["Message"] = "User Successfully Registered";
                            ViewData["MsgType"] = "success";
                        }
                        else
                        {
                            ViewData["Message"] = result;
                            ViewData["MsgType"] = "warning";
                        }
                    }
                    else
                    {
                        ViewData["Message"] = DBUtl.DB_Message;
                        ViewData["MsgType"] = "danger";
                    }
                }
            }
            return View("UserRegister");
        }
    }

大家好，我正在尝试使用 Guid.NewGuid() 发送激活链接，当我想使用“Request.Url.AbsoluteUri.Replace”生成链接时，它会显示错误：

“HttpRequest”不包含“Url”的定义，并且找不到接受“HttpRequest”类型的第一个参数的可访问扩展方法“Url”（您是否缺少 using 指令或程序集引用？）。

有什么解决方法吗？我使用的框架是 c# .net framework 3.1。提前感谢您的帮助！

Answer 1

Related question about how to process verification after sending activation link.

您可以使用以下方法生成网站的基本网址：

string baseUrl = string.Format("{0}://{1}", 
                       HttpContext.Request.Scheme, HttpContext.Request.Host);

HttpContext.Request.Scheme 返回http/https
HttpContext.Request.Host 是主机，即（localhost 或 www.example.com）。
所以基本上你会得到https://www.example.com

然后，您可以将Guid 组合为查询字符串并将其发送给用户。

var activationUrl = $"{baseUrl}/Controller/Action?code={Guid.NewGuid()}";

注意：我使用变体来组合字符串只是为了得到答案。 Later 从 C# 6 开始可用。