C#访问URL地址并返回值

C#访问URL地址并返回值 /// 访问URL地址 public string CallWebPage(string url, int httpTimeout, Encoding postEncoding) { string rStr = ""; System.Net.WebRequest req = null; System.Net.WebResponse resp = null; System.IO.Stream os = null; System.IO.StreamReader sr = null; try { //创建连接 req = System.Net.WebRequest.Create(url); req.ContentType = "application/x-www-form-urlencoded"; req.Method = "GET"; //时间 if (httpTimeout > 0) { req.Timeout = httpTimeout; } //读取返回结果 resp = req.GetResponse(); sr = new System.IO.StreamReader(resp.GetResponseStream(), postEncoding); rStr = sr.ReadToEnd(); int bodystart = rStr.IndexOf("") + 6; // 除去 int bodylenght = rStr.LastIndexOf("") - bodystart; // 除去 rStr = rStr.Substring(bodystart, bodylenght).Trim(); // 除去空格 } catch (Exception ex) { LogUtil.Warn("HttpUtil.CallWebPage 异常(WebException) :" + ex.Message); } finally { try { //关闭资源 if (os != null) { os.Dispose(); os.Close(); } if (sr != null) { sr.Dispose(); sr.Close(); } if (resp != null) { resp.Close(); } if (req != null) { req.Abort(); req = null; } } catch (Exception ex2) { LogUtil.Exception("HttpUtil.CallWebPage 关闭连接异常:" + ex2.Message); } } return rStr; }