本文实例讲述了C#实现下载网页HTML源码的方法。分享给大家供大家参考之用。具体方法如下：
public static class DownLoad_HTML { private static int FailCount = 0; //记录下载失败的次数 public static string GetHtml(string url) //传入要下载的网址 { string str = string.Empty; try { System.Net.WebRequest request = System.Net.WebRequest.Create(url); request.Timeout = 10000; //下载超时时间 request.Headers.Set("Pragma", "no-cache"); System.Net.WebResponse response = request.GetResponse(); System.IO.Stream streamReceive = response.GetResponseStream(); Encoding encoding = Encoding.GetEncoding("gb2312");//utf-8 网页文字编码 System.IO.StreamReader streamReader = new System.IO.StreamReader(streamReceive, encoding); str = streamReader.ReadToEnd(); streamReader.Close(); } catch (Exception ex) { FailCount++; if (FailCount > 5) { var result = System.Windows.Forms.MessageBox.Show("已下载失败" + FailCount + "次，是否要继续尝试？" + Environment.NewLine + ex.ToString(), "数据下载异常", System.Windows.Forms.MessageBoxButtons.YesNo, System.Windows.Forms.MessageBoxIcon.Error); if (result == System.Windows.Forms.DialogResult.Yes) { str = GetHtml(url); } else { System.Windows.Forms.MessageBox.Show("下载HTML失败" + Environment.NewLine + ex.ToString(), "下载HTML失败", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error); throw ex; } } else { str = GetHtml(url); } } FailCount = 0; //如果能执行到这一步就表示下载终于成功了 return str; }
希望本文所述对大家的C#程序设计有所帮助
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