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How to get list of all active HttpModules in ASP.NET?

by 25 Comments

Here is a quick tips to get the list of all active HTTPModules at runtime.  We can get the list of all HttpModules from the web.config or from machine.config file. But, what we need to do if we want to get the list of all active HttpModules during runtime? Yes. We can easily get the details with the help of  HttpApplication and HttpModuleCollection Class. If we quickly recall the IIS Process Request [One detailed Article], when a request reaches to worker Process from client browser, First of all Worker process is responsible to start and HttpRuntime by loading ISAPI filter. After that HttpRuntime load an HttpApplication object with the help of  HttpApplicationFactory class. Each and every request should pass through the corresponding HTTPModule to reach to HTTPHandler, this list of module are configured by the HTTPApplication. Below is the code snippet by which we can get the list of active HttpModules.

        //Get Application Instance from Current Content
        HttpApplication httpApps = HttpContext.Current.ApplicationInstance;
        //Get List of modules in module collections
        HttpModuleCollection httpModuleCollections = httpApps.Modules;
        Response.Write("Total Number Active HttpModule : " + httpModuleCollections.Count.ToString() + "</br>");
        Response.Write("<b>List of Active Modules</b>" + "</br>");
        foreach (string activeModule in httpModuleCollections.AllKeys)
        {
            Response.Write(activeModule + "</br>");
        }

Below is the sample output :

This can be quite useful when we want to check if our custom created  module loaded successfully or not .

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Written by Abhijit Jana

Technology Leader, Technical Strategist, Solution Architect, Development Consultant, and Trusted Technology Advisor with more than 17 years of experience in the IT industry with expertise in Development, Architecting, Engineering, Consulting, Services Delivery and Leadership. I am a former Microsoft MVP, Author of "Kinect for Windows SDK Programming Guide" and "HoloLens BluePrints" books, and founder of The Daily .NET Tips. To know more about me visit the "About Me" page.

25 comments

  1. Pingback: DotNetShoutout

  5. Thanks,
    I have a related question : Can we modify the list of active modules ? like registering a new one based on some condition ?

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  8. Hi,
    @You want to mean activting or deactivating some module at runtime ?
    Yes and without modifying the web.config file (without restarting the app).

    Do you have any idea if it’s possible ?
    Thank you!

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  9. Hi Abhijit,

    Nice one. It can be really very useful in some of the specific requirements of the applications.

    Regards,
    Sandeep Ramani

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  11. There are mistape: foreach (string activeModule inttpModuleCollections.AllKeys)
    should be: foreach (string activeModule in httpModuleCollections.AllKeys)

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