获取链接的根部

Question

一个在我的控制器方法返回一个具有像http://localhost:17000/Questionnaire/CompleteQuestionnaire?GuidToken=4815823D-3BFF-487D-AEB0-BB874AE9FBDE
链接和其他方法返回一个视图只是链接象/Questionnaire/CompleteQuestionnaire?GuidToken=4815823D-3BFF-487D-AEB0-BB874AE9FBDE

[HttpGet] 
    public JsonResult ShowUrlQuestionnaire(int id) 
    { 
     var questionnaire = QuestionnaireRepository.GetById(id); 
     var questionnaireUrl = "/Questionnaire/CompleteQuestionnaire?GuidToken=" + questionnaire.QuestionnaireId.ToString(); 
     return Json(questionnaireUrl, "text/html", System.Text.Encoding.UTF8, 
        JsonRequestBehavior.AllowGet); 
    } 

如何添加链接的根部分var questionnaireUrl？

我试图在控制器

private string GetBaseUrl() 
    { 
     var request = HttpContext.Current.Request; 
     var appUrl = HttpRuntime.AppDomainAppVirtualPath; 

     if (!string.IsNullOrWhiteSpace(appUrl)) appUrl += "/"; 

     var baseUrl = string.Format("{0}://{1}{2}", request.Url.Scheme, request.Url.Authority, appUrl); 

     return baseUrl; 
    } 

添加这个方法，但我得到了错误
Error 1 'System.Web.HttpContextBase' does not contain a definition for 'Current' and no extension method 'Current' accepting a first argument of type 'System.Web.HttpContextBase' could be found (are you missing a using directive or an assembly reference?) 如何解决呢？

Answer 1

我发现这里的解决方案How can you get the “real” HttpContext within an ASP.NET MVC application?
我在我的代码

var request = System.Web.HttpContext.Current.Request; 

改变，现在它的工作原理。