//This function is invoked the first time a request is made to XAMLx file
//It caches url as key and one of the
//following 4 as value -> "Handler/Factory/HandlerCLRType/Exception"
IHttpHandler GetHandlerFirstTime(HttpContext context, string requestType,
string url, string pathTranslated)
{
Type httpHandlerType;
ConfigurationErrorsException configException;
//GetCompiledType is costly - invoke it just once.
//This null check is required for "error after GetCompiledType on first attempt" cases only
if (this.hostedXamlType == null)
{
this.hostedXamlType = GetCompiledCustomString(context.Request.AppRelativeCurrentExecutionFilePath);
}
if (XamlHostingConfiguration.TryGetHttpHandlerType(url, this.hostedXamlType, out httpHandlerType))
{
if (TD.HttpHandlerPickedForUrlIsEnabled())
{
TD.HttpHandlerPickedForUrl(url, hostedXamlType.FullName, httpHandlerType.FullName);
}
if (typeof(IHttpHandler).IsAssignableFrom(httpHandlerType))
{
IHttpHandler handler = (IHttpHandler)CreateInstance(httpHandlerType);
if (handler.IsReusable)
{
this.cachedResult = handler;
}
else
{
this.cachedResult = httpHandlerType;
}
return(handler);
}
else if (typeof(IHttpHandlerFactory).IsAssignableFrom(httpHandlerType))
{
IHttpHandlerFactory factory = (IHttpHandlerFactory)CreateInstance(httpHandlerType);
this.cachedResult = factory;
IHttpHandler handler = factory.GetHandler(context, requestType, url, pathTranslated);
return(HandlerWrapper.Create(handler, factory));
}
else
{
configException =
new ConfigurationErrorsException(SR.NotHttpHandlerType(url, this.hostedXamlType, httpHandlerType.FullName));
this.cachedResult = configException;
throw FxTrace.Exception.AsError(configException);
}
}
configException =
new ConfigurationErrorsException(SR.HttpHandlerForXamlTypeNotFound(url, this.hostedXamlType, XamlHostingConfiguration.XamlHostingSection));
this.cachedResult = configException;
throw FxTrace.Exception.AsError(configException);
}
//This function retrievs the cached object and uses it to get handler or exception
IHttpHandler GetHandlerSubSequent(HttpContext context, string requestType,
string url, string pathTranslated)
{
if (this.cachedResult is IHttpHandler)
{
return((IHttpHandler)this.cachedResult);
}
else if (this.cachedResult is IHttpHandlerFactory)
{
IHttpHandlerFactory factory = ((IHttpHandlerFactory)this.cachedResult);
IHttpHandler handler = factory.GetHandler(context, requestType, url, pathTranslated);
return(HandlerWrapper.Create(handler, factory));
}
else if (this.cachedResult is Type)
{
return((IHttpHandler)CreateInstance((Type)this.cachedResult));
}
else
{
throw FxTrace.Exception.AsError((ConfigurationErrorsException)this.cachedResult);
}
}