how to get the Compiler error message? asp.net

How can I get the Compiler Error Message if I have the pageUrl?

I tried using the HttpWebRequest class, but I haven't gotten the result yet.

I have collection of pages, that must execute automatically, and if the page fails, I need it to create a log.

Thank y开发者_开发知识库ou

You can catch all application errors in application global class (global.asax) in Application_Error handler.

Other way. You can catch exceptions in custom error module as well, just register you module in <httpModules> section and implement following function there:

void context_Error(object sender, EventArgs e)
        {
        HttpApplication application = (HttpApplication)sender;
        HttpContext context = application.Context;

        Exception ex = context.Server.GetLastError();
        //... here goes some code
        }

Thus you have to ways to catch any error. Other task is to request all pages. As I can see from your post, you've already have such solution.

string pagetext = (new System.Net.WebClient()).DownLoadString(<url>);

//Add a better control here
if(pagetext.Contains("Server Error"))
{
     `enter code here`
 }

You can write a program to visit the pages, if the response of the request is a HTTP error than you can investigate further.

If you do not want to write your own program to detect errors originating from HTTP requests, you can use a testing framework like selenium.

Disclaimer: I do very little with ASP.NET type stuff.

ELMAH might help you a bit. It's an error logger for ASP.NET projects.

Where are you trying to catch these exceptions? In your website, or in an external application that is crawling a site?

In an external application, using an HttpWebRequest you'd do something like this:

string urlToTry = "http://www.example.com/ServerErrorPage.htm";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlToTry);

try
{
  HttpWebResponse response = (HttpWebResponse)request.GetResponse();

  // Process your success response.
}
catch (WebException we)
{
  HttpWebResponse error = (HttpWebResponse)we.Response;

  // If you want to log multiple codes, prefer a switch statement.
  if (error.StatusCode == HttpStatusCode.InternalServerError)
  {
    // This is your 500 internal server error, perform logging.
  }
}

The WebException class will give you messages like:

The remote server returned an error: (500) Internal Server Error.

Once you cast them to an HttpWebResponse, you can get at the StatusCode and perform whatever logging you require.