Question

我正在尝试从本地网络设备下载多个文件： http file directory

我想编写一个代码，自动将所有这些.avi文件下载到我的电脑驱动器中。

我有两个问题：

问题1：仅使用WebClient类进行身份验证。如果我只使用WebClient类进行连接，则会收到401 Unauthorized错误。

代码：

try
{
    using (WebClient myWebClient = new WebClient())
    { 
                    myWebClient.UseDefaultCredentials = false;
                    myWebClient.Credentials = new NetworkCredential("user", "pword");
                    String userName = "user";
                    String passWord = "pword";
                    string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(userName + ":" + passWord));
                    myWebClient.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials;
                    Console.WriteLine("Header AUTHORIZATION: "+ myWebClient.Headers[HttpRequestHeader.Authorization].ToString());

                // Download the Web resource and save it into the current filesystem folder.
                Console.WriteLine("Start DL");
                myWebClient.DownloadFile("http://192.168.2.72:81/sd/20170121/record000/P170121_000000_001006.avi", "P170121_000000_001006.avi");
                Console.WriteLine("End DL");
      }
}
catch(Exception ex)
{
                Console.WriteLine("DOWNLOAD ERROR: " + ex.ToString());
 }

错误消息：无法进行身份验证 401 Unauthorized Error

问题2：能够使用WebProxy类进行身份验证但无法下载。获取403未找到错误。

代码：

try
{
    using (WebClient myWebClient = new WebClient())
    {
            WebProxy wp = new WebProxy("http://192.168.2.72:81/sd/20170121/record000/",false);                   
            wp.Credentials = new NetworkCredential("user","pword");
            Console.WriteLine("Web Proxy: " + wp.Address);
            myWebClient.UseDefaultCredentials = false;
            myWebClient.Credentials = wp.Credentials;
            myWebClient.Proxy = wp;
            Console.WriteLine("Downloading File \"{0}\" from \"{1}\"\n\n", filename, wp.Address);

            // Download the Web resource and save it into the current filesystem folder.
            Console.WriteLine("Start DL");
            myWebClient.DownloadFile("http://192.168.2.72:81/sd/20170121/record000/P170121_000000_001006.avi", "P170121_000000_001006.avi");
            Console.WriteLine("End DL");
        }
     }
     catch(Exception ex)
     {
         Console.WriteLine("DOWNLOAD ERROR: " + ex.ToString());
     }

错误消息：403 Not Found

DOWNLOAD ERROR：System.Net.WebException：远程服务器返回错误：（404）Not Found。在System.Net.WebClient.DownloadFile（Uri地址，字符串fileName）在System.Net.WebClient.DownloadFile（String address，String fileName）在C：\ Users \ Gordon \ documents \ visual studio 2015 \ Projects \ ConsoleApplication2 \ ConsoleApplication2 \ Program.cs：第139行中的ConsoleApplication2.Program.Main（String [] args）

请帮助我确定我的代码中是否有任何错误，或者是否有更好的方式提交凭据并下载所有文件。

提前致谢！

Answer 1

我不是Dot Net开发者，我只是分享我的意见。在第二点中，您提到您将获得403，这是Acces Denied的Http状态代码。我觉得你的凭证无效，或者你没有权利进行操作。

C＃从HTTP文件目录下载文件，获取401错误或403错误

1 个答案: