C#实现下载网页HTML源码的方法

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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