MSDN Magazine - February 2009 - (Page 35)

this scenario. As a result, if the assembly passed as an argument to LoadPackage has a dependency on another assembly (even in the same XAP package), you get an exception as soon as the execution flow reaches a class in the dependency assembly. The point is that all assemblies in the package should be loaded in memory. For this to happen, you need to access the manifest file, read about deFigure 6 Cache Support for the Downloader Component public void LoadPackage(string xap, string asm, string cls) { // Cache data within the class Initialize(xap, asm, cls, PackageContent.ClassFromAssembly); // Have a look in the cache Stream xapStream = LookupCacheForPackage(); if (xapStream == null) StartDownload(); else { // Process and extract resources FindClassFromAssembly(xapStream); } } protected Stream LookupCacheForPackage() { // Look up the XAP package for the assembly. // Assuming the XAP URL is a file name with no HTTP information string xapFile = m_data.XapName; return DownloadCache.Load(xapFile); } protected void StartDownload() { Uri address = new Uri(m_data.XapName, UriKind.RelativeOrAbsolute); WebClient client = new WebClient(); switch (m_data.ActionRequired) { case PackageContent.ClassFromAssembly: client.OpenReadCompleted += new OpenReadCompletedEventHandler(OnCompleted); break; default: return; } client.OpenReadAsync(address); } private void OnCompleted(object sender, OpenReadCompletedEventArgs e) { // Handler registered at the application level? if (XapDownloaded == null) return; if (e.Error != null) return; // Save to the cache DownloadCache.Add(m_data.XapName, e.Result); // Process and extract resources FindClassFromAssembly(e.Result); } private void FindClassFromAssembly(Stream content) { // Load a particular assembly from XAP Assembly a = GetAssemblyFromPackage(m_data.AssemblyName, content); // Get an instance of the specified user control class object page = a.CreateInstance(m_data.ClassName); // Fire the event XapEventArgs args = new XapEventArgs(); args.DownloadedContent = page as UserControl; XapDownloaded(this, args); } What are you looking for in a PDF solution? Amyuni PDF Suite combines our high-performance PDF Converter and PDF Creator products: PDF Converter I Integrate PDF conversion capabilities into any application using a few lines of code I Work with a PDF converter designed to perform in multi- threaded and 64-bit Windows environments I Convert documents into PDF in a fraction of the time used by other tools I Generate ISO-compliant documents using PDF/A and PDF/X formats I Develop custom plugins that enable page-by-page processing of PDF data PDF Creator I View, edit, annotate, and print PDF documents and forms I Include different types of form objects and annotation tools such as edit fields, check boxes, sticky notes, and highlighters I Create well structured, optimized, and accurate PDF documents I Embed standard or custom XMP metadata in PDFs to facilitate document exchange I Export PDF documents into a number of formats such as XPS, RTF, HTML, JPEG, TIFF, and Excel www.amyuni.com All trademarks are property of their respective owners. © 1999-2009 AMYUNI Technologies. All rights reserved. msdnmagazine.com February 2009 35 http://www.amyuni.com http://www.amyuni.com http://www.msdnmagazine.com

Table of Contents Feed for the Digital Edition of MSDN Magazine - February 2009

MSDN Magazine - February 2009 Contents Toolbox CLR Inside Out Data Points Cutting Edge Patterns In Practice Best Practices .Net Interop "Oslo" Basics Patterns Silverlight Under The Table Foundations Windows With C++ .NET Matters Going Places { End Bracket }

MSDN Magazine - February 2009

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.