How to handle application start event in ASP.NET module

Question

I am writing an asp.net HTTP module which needs to read configuration data once from a local file (say config.xml stored in application root directory) and then based on configuration perform some processing on incoming requests.

Since there is no Application_Start/Application_init hooking available in Asp.NET modules, what would be the best way to handle the scenario. I am trying to avoid reading configuration file each time a request comes. Ideally, I want to read the config file when application starts.

I need to code this in http module only and do not want to use Global.asax

Why dont you use static variables for this? Static means for all Sessions. — Tim Schmelter
– Tim Schmelter, Commented Jun 25, 2010 at 15:06
Static class objects are initialized only on first access, not when the IIS app pool starts up. The Application_Start handler is better if initialization must be immediate on startup. — spoulson
– spoulson, Commented Jun 25, 2010 at 15:22

Antony Scott · Accepted Answer · 2010-07-01 19:16:40Z

1

I'd go for a simple property, something like this ...

public MyConfig Config
{
    get
    {
        MyConfig _config = Application["MyConfig"] as MyConfig;
        if (_config == null)
        {
            _config = new MyConfig(...);
            Application["MyConfig"] = _config;
        }
        return _config;
    }
}

that way you just access whatever you need from Config via the property ...

int someValue = Config.SomeValue;

and it's loaded into the application object if it hasn't been already

If you need the config on a per-user basis rather than globally, then just use Session["MyConfig"] instead of Application["MyConfig"]

edited Jul 1, 2010 at 19:16

answered Jul 1, 2010 at 19:01

Antony Scott

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Chris Van Opstal · Accepted Answer · 2010-06-25 15:09:52Z

0

Not sure if this would work, but you might be able to implement this in the module's init method.

answered Jun 25, 2010 at 15:09

Chris Van Opstal

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1 Comment

gauravphoenix Over a year ago

I just tried it. It seems that that variables/objects etc in Init method are not available in HTTPmodule "hookable" events like Application_BeginRequest etc

Richard Friend · Accepted Answer · 2010-06-25 15:12:03Z

0

In the init method of your httpmodule you can hook up to the event in the context.

For example :

public void Init(HttpApplication context)
    {

        context.PostRequestHandlerExecute += (sender, e) =>
        {
            Page p = context.Context.Handler as Page;
            if (p != null)
            {
            ///Code here    
            }
        };
    }

answered Jun 25, 2010 at 15:12

Richard Friend

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1 Comment

Richard Friend Over a year ago

just noticed there is no start event to hook upto, why not just populate the data in the init method of your http module...

Chris Marisic · Accepted Answer · 2010-06-25 15:18:17Z

0

public SomeHttpModule : IHttpModule
{    
    private static readonly Configuration Configuration = 
            ConigurationReader.Read();    
}

answered Jun 25, 2010 at 15:18

Chris Marisic

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gauravphoenix · Accepted Answer · 2010-06-26 03:25:36Z

0

static variable did the trick. here is the code if someone is interested -

static string test; 
        public void Init(HttpApplication application)
        {


            application.BeginRequest +=(new EventHandler(this.Application_BeginRequest));
            test = "hi"; 
            application.EndRequest +=(new EventHandler(this.Application_EndRequest));


        }
       private void Application_BeginRequest(Object source,EventArgs e)
        {
            {
                HttpApplication application = (HttpApplication)source ;
                HttpContext context = application.Context;
                context.Response.Write(test);
            }


        }

answered Jun 26, 2010 at 3:25

gauravphoenix

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