1. WebClient：提供用于将数据发送到由 URI 标识的资源及从这样的资源接收数据的常用方法。
   
   

    1 WebClient client = new WebClient(); 2 //下载文件 3 client.DownloadFile(strUrlFilePath, localFilePath); 4  5  //上传文件:打开写入流，写入数据 6  Stream postStream = webClient.OpenWrite(targetUrl, "PUT"); 7  if (postStream.CanWrite) 8  { 9       postStream.Write(postArray, 0, postArray.Length);10  }11              

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