C#完成下載網頁HTML源碼的辦法。本站提示廣大學習愛好者:(C#完成下載網頁HTML源碼的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#完成下載網頁HTML源碼的辦法正文
本文實例講述了C#完成下載網頁HTML源碼的辦法。分享給年夜家供年夜家參考之用。詳細辦法以下:
public static class DownLoad_HTML { private static int FailCount = 0; //記載下載掉敗的次數 public static string GetHtml(string url) //傳入要下載的網址 { string str = string.Empty; try { System.Net.WebRequest request = System.Net.WebRequest.Create(url); request.Timeout = 10000; //下載超不時間 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 網頁文字編碼 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("已下載掉敗" + FailCount + "次,能否要持續測驗考試?" + Environment.NewLine + ex.ToString(), "數據下載異常", 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("下載HTML掉敗" + Environment.NewLine + ex.ToString(), "下載HTML掉敗", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error); throw ex; } } else { str = GetHtml(url); } } FailCount = 0; //假如能履行到這一步就表現下載終究勝利了 return str; }
願望本文所述對年夜家的C#法式設計有所贊助