获取页面源代码，怎么老是报“远程服务器返回错误: (500) 内部服务器错误”？

        /// <summary>
        /// 通过URL执行WEN后获取页面内容
        /// </summary>
        /// <param name="url"></param>
        public static string ExecutePage(string urlstr)
        {
            string content = "";            if (urlstr.IndexOf("http://", StringComparison.OrdinalIgnoreCase) != 0 && urlstr.IndexOf("/") == 0)
            {
                urlstr = "http://" + HttpContext.Current.Request.Url.Host + urlstr;
            }
            else if (urlstr.IndexOf("http://", StringComparison.OrdinalIgnoreCase) != 0)
            {
                urlstr = "http://" + urlstr;
            }            System.Net.WebResponse wResp = null;
            System.IO.Stream respStream = null;
            System.IO.StreamReader reader = null;
            try
            {
                Uri url = new Uri(urlstr);
                System.Net.WebRequest wReq = System.Net.WebRequest.Create(url);
                wResp = wReq.GetResponse();
                respStream = wResp.GetResponseStream();
                reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));
                content = reader.ReadToEnd();
            }
            catch (System.Net.WebException ex)
            {
                //return ex.Source + ":" + urlstr;
                throw;
            }
            finally
            {
                if (reader!= null)
                    reader.Close();
                if (respStream != null)
                    respStream.Close();
                if (wResp != null)
                    wResp.Close();            }
            return content;
        }调用ExecutePage("http://www.163.com") 正常。调用ExecutePage("http://localhost") 正常。调用ExecutePage("http://localhost/ReviewBox/ReviewArticle.aspx?id=1") 报错。http://localhost/ReviewBox/ReviewArticle.aspx?id=1 正常显示.

解决方案 »

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去掉?id=1也后用 http://localhost/ReviewBox/ReviewArticle.aspx 也是可以直接访问的。
调用ExecutePage("http://localhost/ReviewBox/ReviewArticle.aspx");同样问题。
Uri url = new Uri(urlstr);
System.Net.WebRequest wReq = System.Net.WebRequest.Create(url);你看下你的url地址是什麼！
断点试试呀，应该是你URL重写那里出了点问题
wResp = wReq.GetResponse();开始报null
如果http://localhost/ReviewBox/ReviewArticle.aspx?id=1可以正常显示，就可以正常抓取
再检查
用到this.Server.Execute却很好。但是怎么获取到源码了，总不能先存在txt在读取吧....
带url参数的不能像你这样直接用!
http://localhost/ReviewBox/ReviewArticle.aspx
也是允许的。
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string artNO = this.Request["articleNO"];
                if (artNO == null || artNO == "")
                {
                    return;
                    //这里我就退出去了，不知这样可以吗？
                }
                modelart = bllart.GetModel(artNO);
                if (modelart == null)
                {
                    return;
                }
            }
        }
改成下面测试下:System.Net.HttpWebResponse wResp = null;
            System.IO.Stream respStream = null;
            System.IO.StreamReader reader = null;
            try
            {
                Uri url = new Uri(urlstr);
                System.Net.WebRequest wReq = System.Net.WebRequest.Create(url);
                wResp = (HttpWebResponse)wReq.GetResponse();
                respStream = wResp.GetResponseStream();
                reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));
                content = reader.ReadToEnd();
            }
            catch (System.Net.WebException ex)
            {
                //return ex.Source + ":" + urlstr;
                throw;
            }
忘了说后来我把ID换成articleNO了
或者参考下:
http://topic.csdn.net/t/20020924/14/1049079.html
总算找到原因了，ReviewArticle.aspx 页面有个FCKedit
<html>
    <head>
        <title>未将对象引用设置到对象的实例。</title>
        <style>
         body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
         p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
         b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
         H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
         H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
         pre {font-family:"Lucida Console";font-size: .9em}
         .er {font-weight: bold; color: black;text-decoration: none;}
         .version {color: gray;}
         .error {margin-bottom: 10px;}
         .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
        </style>
    </head>    <body bgcolor="white">            <span><H1>“/”应用程序中的服务器错误。<hr width=100% size=1 color=silver></H1>            <h2> <i>未将对象引用设置到对象的实例。</i> </h2></span>            <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">            <b> 说明: </b>执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。            <br><br>            <b> 异常详细信息: </b>System.NullReferenceException: 未将对象引用设置到对象的实例。<br><br>            <b>源错误:</b> <br><br>            <table width=100% bgcolor="#ffffcc">
               <tr>
                  <td>
                      <code>执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。</code>                  </td>
               </tr>
            </table>            <br>            <b>堆栈跟踪:</b> <br><br>            <table width=100% bgcolor="#ffffcc">
               <tr>
                  <td>
                      <code><pre>[NullReferenceException: 未将对象引用设置到对象的实例。]
   FredCK.FCKeditorV2.FCKeditor.IsCompatibleBrowser(HttpRequest request) in C:\Documents and Settings\xsasa\桌面\FCKeditor.Net_2.6.3\FCKeditor.cs:494
   FredCK.FCKeditorV2.FCKeditor.IsCompatibleBrowser() in C:\Documents and Settings\xsasa\桌面\FCKeditor.Net_2.6.3\FCKeditor.cs:476
   FredCK.FCKeditorV2.FCKeditor.CheckBrowserCompatibility() in C:\Documents and Settings\xsasa\桌面\FCKeditor.Net_2.6.3\FCKeditor.cs:466
   FredCK.FCKeditorV2.FCKeditor.OnPreRender(EventArgs e) in C:\Documents and Settings\xsasa\桌面\FCKeditor.Net_2.6.3\FCKeditor.cs:400
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842
</pre></code>                  </td>
               </tr>
            </table>            <br>            <hr width=100% size=1 color=silver>            <b>版本信息:</b> Microsoft .NET Framework 版本:2.0.50727.3053; ASP.NET 版本:2.0.50727.3053            </font>    </body>
</html>
ReviewArticle.aspx 页面有个FCKedit 就有NULL，怎么解决了？
参数(HttpRequest request )string sUserAgent = request.UserAgent;是NULL有什么办法？