[导入][C#]通过Url抓取网页内容

// used to build entire input
StringBuilder sb  = new StringBuilder();

// used on each read operation
byte[]        buf = new byte[8192];

// prepare the web page we will be asking for
HttpWebRequest  request  = (HttpWebRequest)
 WebRequest.Create(rUrl);

// execute the request
HttpWebResponse response = (HttpWebResponse)
 request.GetResponse();

// we will read data via the response stream
Stream resStream = response.GetResponseStream();

string tempString = null;
int totalcount = 0;
int    count      = 0;
FileStream fs = File.Create(Server.MapPath("urltext.html"));

do
{
 // fill the buffer with data
 count = resStream.Read(buf, 0, buf.Length);

 // make sure we read some data
 if (count != 0)
 {
  // translate from bytes to ASCII text
  tempString = Encoding.ASCII.GetString(buf, 0, count);
  fs.Write(buf,0,count);
  // continue building the string
  sb.Append(tempString);
 }

 totalcount += count;
}
while (count > 0); // any more data to read?

this.Label2.Text = totalcount.ToString();
resStream.Close();
fs.Close();

return sb.ToString();

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