try
{
SendRequest("http://www.sina.com.cn");
}
catch
{
//不可用
}public string SendRequest( string requestUrl )
{
HttpWebRequest httpWebRequest = ( HttpWebRequest ) WebRequest.Create( requestUrl );
httpWebRequest.Method = "GET";
WebResponse webResponse = httpWebRequest.GetResponse();
StreamReader responseStream = new StreamReader( webResponse.GetResponseStream(), System.Text.Encoding.UTF8 );
_responseStr = responseStream.ReadToEnd();
webResponse.Close();
responseStream.Close();
return _responseStr;
}
{
SendRequest("http://www.sina.com.cn");
}
catch
{
//不可用
}public string SendRequest( string requestUrl )
{
HttpWebRequest httpWebRequest = ( HttpWebRequest ) WebRequest.Create( requestUrl );
httpWebRequest.Method = "GET";
WebResponse webResponse = httpWebRequest.GetResponse();
StreamReader responseStream = new StreamReader( webResponse.GetResponseStream(), System.Text.Encoding.UTF8 );
_responseStr = responseStream.ReadToEnd();
webResponse.Close();
responseStream.Close();
return _responseStr;
}
你没有定义不可用的标准,如何去做呢??