无效的 URI：URI 方案在 aspx 中无效

Question

当我在代码中对 url 进行硬编码时，它可以工作。我正在尝试获取主机名并附加请求。它给出了这个错误，

无效 URI：URI 方案无效。

说明：在执行当前网络请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

Exception Details: System.UriFormatException: Invalid URI: The URI scheme is not valid.
Source Error: 
Line 44:         string request = url.Scheme + "//" + url.Host + ":" + url.Port +"/accounts1/asp2netbridge.asp?sessVar=";
Line 45:       
Line 46:         HttpWebRequest _myRequest = (HttpWebRequest)WebRequest.Create(new Uri(request + sessionValue));
Line 47:         _myRequest.ContentType = "text/html";
Line 48:         _myRequest.Credentials = CredentialCache.DefaultCredentials;

代码如下：

  Uri url = HttpContext.Current.Request.Url;
  string request = url.Scheme + "//" + url.Host + ":" + url.Port +"/accounts1/asp2netbridge.asp?sessVar=";      
  HttpWebRequest _myRequest = (HttpWebRequest)WebRequest.Create(new Uri(request + sessionValue));

Answer 1

在“//”前加“:”

字符串请求 = url.Scheme + "://" + url.Host + ":" + url.Port +"/accounts1/asp2netbridge.asp?sessVar=";