WebClient 对象实现下载和上传

1.引用组件

   using  System.Net;  using  System.IO;

2.下载数据

   一：DownloadFile

   System.Net.WebClient wc = new System.Net.WebClient();

   client.DownloadFile("http://www.baidu.com/", "E:\\baidu.txt");

  二：DownloadData

   System.Net.WebClient wc = new System.Net.WebClient();

   byte[] bytes = wc.DownloadData("http://www.baidu.com/");

   //百度编码是GB2312

   string str = (System.Text.Encoding.GetEncoding("gb2312").GetString(bytes);

 三：OpenRead

  System.Net.WebClient wc = new System.Net.WebClient();

  System.IO.Stream stream = wc.OpenRead("http://www.baidu.com/");

  System.IO.StreamReader reader = new System.IO.StreamReader

  (stream, System.Text.Encoding.GetEncoding("gb2312")))

  string str = reader.ReadToEnd();

  reader.Close();

  stream.Close(); 

2.上传数据

   一：UploadFile

   System.Net.WebClient wc = new System.Net.WebClient();

   wc.UploadFile("http://localhost/uploadFile.aspxs/a.txt", "E:\\a.txt");

   二：UploadData

   System.Net.WebClient wc = new System.Net.WebClient();

   string postData ="wc=webclient";

   wc.Headers.Add("Content-Type","application/x-www-form-urlencoded");

   byte[] byteArray = Encoding.ASCII.GetBytes(postData);

   //上传并获取返回数据

   byte[] responseArray = wc.UploadData(http://localhost/uploadFile.aspxs/a.txt","POST",byteArray);