大家好，又见面了，我是你们的朋友全栈君。
参看了MVP的利用WebClient和WebRequest类获得网页源代码于是想自己动手写点，当然是参考其的办法啦。
我这次下载了visual web developer 2005 express
按照上面的文章编写了代码，
我的btn函数如下
string urlPage = “”;
urlPage = UrlText.Text;
WebRequest request = WebRequest.Create(urlPage);
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();
但是一debug运行发现出现了一下错误
A potentially dangerous Request.Form value was detected from the client
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ContentHtml=”<html>
<head>
<met…”).
仔细找了下解决方法和问题的原因原来是validaterequest的问题，以下是网络的参考连接，写的很详细，非常好呵呵
http://access911.net/index.asp?board=4&recordid=71FAB51E15DCE7F3
http://support.microsoft.com/default.aspx?scid=kb;en-us;821343&Product=aspnet
按照上面的说法解决方案又三种，
1.静止页面的validateRequest
<%@ Page validateRequest=”false” %>
2.设置web.config
<configuration>
<system.web>
<pages validateRequest=”false” />
</system.web>
</configuration>
3.我个人认为是最好的，就是采用Server.HtmlEncode这个方法
我改动如下
string urlPage = “”;
urlPage = UrlText.Text;
WebRequest request = WebRequest.Create(urlPage);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
ContentHtml.Text = Server.HtmlEncode(sr.ReadToEnd());
resStream.Close();
sr.Close();
ok运行一下，搞定。不错不错
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