Question

I’m trying to use a custom configuration section, something I’ve done numerous times before with success, but for some reason, today it’s not working. The code for the configuration section is:

public class RedirectorConfiguration : ConfigurationSection {     [ConfigurationProperty('requestRegex', DefaultValue = '.*')]     public string RequestRegex { get; set; }      [ConfigurationProperty('redirectToUrl', IsRequired = true)]     public string RedirectToUrl { get; set; }      [ConfigurationProperty('enabled', DefaultValue = true)]     public bool Enabled { get; set; } } 

The relevant sections from the web.config are:

<?xml version='1.0'?> <configuration>     <configSections>         <section name='httpRedirector' type='Company.HttpRedirector.RedirectorConfiguration, Company.HttpRedirector'/>     </configSections>     <httpRedirector redirectToUrl='http://www.google.com' /> </configuration> 

And I’m trying to use the code in the following HttpModule:

using System; using System.Configuration; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; using System.Web;  namespace Company.HttpRedirector {     public class HttpRedirectorModule : IHttpModule     {         static RegexOptions regexOptions = RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace;         static Regex requestRegex = null;          public void Dispose() { }          public void Init(HttpApplication context)         {             context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);         }          void context_PreRequestHandlerExecute(object sender, EventArgs e)         {             var app = sender as HttpApplication;             var config = ConfigurationManager.GetSection('httpRedirector') as RedirectorConfiguration;              if (app == null || app.Context == null || config == null)                 return; // nothing to do              if (requestRegex == null)             {                 requestRegex = new Regex(config.RequestRegex,                     regexOptions | RegexOptions.Compiled);             }              var url = app.Request.Url.AbsoluteUri;             if (requestRegex != null || requestRegex.IsMatch(url))             {                 if (!string.IsNullOrEmpty(config.RedirectToUrl))                     app.Response.Redirect(config.RedirectToUrl);             }         }     } } 

What’s happening is that the config object comes back successfully, but all of the properties marked ‘ConfigurationProperty’ are set to null / type defaults, as if it never attempted to map the values from the config file. There are no exceptions during the startup process.

Any idea what’s going on here?

Answer 1

Your configuration class doesn’t have the properties correct. It should read:

    [ConfigurationProperty('requestRegex', DefaultValue = '.*')]     public string RequestRegex     {         get         {             return (string)this['requestRegex'];         }         set         {             this['requestRegex'] = value;         }      }