Question

Take the following lines of code that would work fine in a c# asp.net file:

Response.Cache.SetExpires(DateTime.Now.AddSeconds(300));
Response.Cache.SetCacheability(HttpCacheability.Public);

Can I set these in some way in global.asax so that by default my entire application will support 300 second public caching?

Answer 1

Yes you can do that, probably on

protected void Application_PreRequestHandlerExecute(HttpApplication sender, EventArgs e)
{
    string sExtentionOfThisFile = System.IO.Path.GetExtension(HttpContext.Current.Request.Path);

    if (sExtentionOfThisFile.EndsWith("aspx", true, System.Globalization.CultureInfo.InvariantCulture) ||
        sExtentionOfThisFile.EndsWith("ashx", true, System.Globalization.CultureInfo.InvariantCulture) ||
        sExtentionOfThisFile.EndsWith("xml", true, System.Globalization.CultureInfo.InvariantCulture)
        )
    {           
       Response.Cache.SetExpires(DateTime.Now.AddSeconds(300));
       Response.Cache.SetCacheability(HttpCacheability.Public);        
   }
}

but then you can not removed so easy… if any pages need to.

(I have include a page test, but just to see it, you can chose and test, if you won everything to have this header.)