利用WebClient和WebRequest类获得网页源代码_[Asp.Net教程]

关键是ValidateRequest="false",要不然会说request.form，报错

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="test_Default3" ValidateRequest="false"%>

得到任意网页源代码


onClick="WebClientButton_Click">
onClick="WebRequestButton_Click">
onClick="GetText_Click" Text="Button" />

private string PageUrl = "";

protected void WebClientButton_Click(object sender, System.EventArgs e)
{
PageUrl = UrlText.Text;
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;

/**////方法一：
Byte[] pageData = wc.DownloadData(PageUrl);
ContentHtml.Text = Encoding.Default.GetString(pageData);

/**//// 方法二：
/// ***************代码开始**********
/// Stream resStream = wc.OpenRead(PageUrl);
/// StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);
/// ContentHtml.Text = sr.ReadToEnd();
/// resStream.Close();
/// **************代码结束********
///
wc.Dispose();
}

protected void WebRequestButton_Click(object sender, System.EventArgs e)
{
PageUrl = UrlText.Text;
WebRequest request = WebRequest.Create(PageUrl);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();
}

protected void GetText_Click(object sender, System.EventArgs e)
{
PageUrl = UrlText.Text;
WebRequest request = WebRequest.Create(PageUrl);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();
ContentHtml.Text = Regex.Replace(ContentHtml.Text, "<[^>]*>", "");
//替换空格
ContentHtml.Text = Regex.Replace(ContentHtml.Text, "\\s+", " ");
}