WPF 从服务器下载文件

public void DownloadFileFromServer()
{
   string serverFilePath = "http://192.168.1.222:9111/Doc/Test.docx";
   string serverFileName = string.Empty;
   int nameIndex = serverFilePath.LastIndexOf("/");
   if (nameIndex > 0)
   {
       serverFileName = serverFilePath.Substring(nameIndex + 1);
   }
   string dirPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Test");
   if (!Directory.Exists(dirPath))
   {
       DirectoryInfo directoryInfo = new DirectoryInfo(dirPath);
       directoryInfo.Create();
   }
   string targetPath = Path.Combine(dirPath, serverFileName);
   DownloadFile(serverFilePath, targetPath);
 }

public void DownloadFile(string serverFilePath, string targetPath)
{
   HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serverFilePath);
   WebResponse respone = request.GetResponse();
   Stream netStream = respone.GetResponseStream();
   using (Stream fileStream = new FileStream(targetPath, FileMode.Create))
   {
      byte[] read = new byte[1024];
      int realReadLen = netStream.Read(read, 0, read.Length);
      while (realReadLen > 0)
      {
         fileStream.Write(read, 0, realReadLen);
         realReadLen = netStream.Read(read, 0, read.Length);
      }
      netStream.Close();
      fileStream.Close();
    }
 }