Tip: Constructing Private Types

I recently needed to create an instance of the System.Web.StaticFileHandler.  This is a bit difficult as the class is internal so reflection must be used:

   1: private static IHttpHandler _staticFileHandler;

   2:  

   3: private static IHttpHandler StaticFileHandler

   4: {

   5:     get

   6:     {

   7:         if (_staticFileHandler == null)

   8:         {

   9:             Assembly systemWeb = typeof(IHttpHandler).Assembly;

  10:             /* If you don't have a public type to reference a lookup like this could be done

  11:                 Assembly systemWeb = AppDomain.CurrentDomain.GetAssemblies()

  12:                     .Where(ass => ass.GetName().Name == "System.Web")

  13:                     .First();

  14:             */

  15:          

  16:             Type staticFileHandler = systemWeb.GetType("System.Web.StaticFileHandler");

  17:                         ConstructorInfo ci = staticFileHandler.GetConstructor(

  18:                             BindingFlags.NonPublic | BindingFlags.Instance

  19:                             , null

  20:                             , Type.EmptyTypes

  21:                             , null);

  22:             _staticFileHandler = ci.Invoke(null) as IHttpHandler;

  23:             if (_staticFileHandler == null) throw new NotSupportedException("System.Web must contain System.Web.StaticFileHandler");

  24:         }

  25:         return _staticFileHandler;

  26:     }

  27: }

  28:  

  29: /*

  30: using System;

  31: using System.Linq;

  32: using System.Reflection;

  33: using System.Web;

  34: */

Hope it helps.