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At q you create a new memory stream that writes the contents of the BLOB that s been downloaded from BLOB storage. At w you set the MIME type of the file so that you can allow the browser to perform the correct action based on that type (for example, launch Windows Media Player, Microsoft Word, or some other action), and you add the content-disposition header so that the browser knows to offer a Save file dialog box to the user. Finally, the downloaded BLOB is made available to the client by writing the file to the response stream e. In the previous example, we used the DownloadToStream option to download files from BLOB storage but the storage client also offers these methods to download files: DownloadText, DownloadByteArray, and DownloadToFile.

And of course, more recently, web developers have started creating AJAX web pages that contain a lot of JavaScript code and do callbacks to the server through Web Services or specialized web pages AJAX is an attempt to make browser-based applications approach the richness available to Windows applications The same rules apply here: the code running in the browser should be viewed as a separate application that is not trusted by the server application In these latter two cases, it is important to realize that JavaScript is not object-oriented and is not at the same level of technology as NET on the web server You can apply the object-oriented concepts from this book on your web server, but the JavaScript and AJAX concepts in the browser are far more limited.

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The Data Access region contains the DataPortal_XYZ or Child_XYZ methods, unless you use the ObjectFactory attribute, in which case any code that would have been in the DataPortal_XYZ methods is in a separate object factory class. Your business objects may require other code that doesn t fit neatly into these regions, and you should feel free to add extra regions if needed. But these regions cover the vast majority of code required by typical business objects, and in most cases they re all you ll need.

So far we ve shown you how to download files that are in public or private containers. What if you want to do something a little more granular, like control access to your BLOBs or containers For operations like this, you can use a Shared Access Signature. Later on, we ll look at this feature in a little more detail. Now that you know how to upload and download BLOBs, let s look at how you can integrate BLOB storage with your existing ASP.NET websites.

As you ll see, the object-oriented concepts and techniques shown in this book can be used to create smart client applications that call Web Services on your servers They can be used to create those Web Services They can also be used to create Web Forms applications, in which those web pages may use simple HTML, more complex client-side JavaScript, or even AJAX-based technologies..

In typical ASP.NET websites, you usually distribute your assets with your website. Although this strategy works great for small websites, it s pretty much unmanageable when dealing with larger websites. Do you really want to redeploy your entire website just because you have a new Hawaiian shirt in your product range and you need to add an image of it There s a better way. In this section, we ll tell you how you can integrate public assets and private assets (such as purchased MP3 files) with your ASP.NET website. Let s return to the Hawaiian Shirt Shop example from chapter 2 to find out how you can integrate your assets.

Any root business object can specify an ObjectFactory attribute, which causes the data portal to change its behavior. Rather than directly interacting with the business object, the data portal creates an instance of an object factory class and it interacts with that factory object. Applying the ObjectFactory attribute is straightforward: [ObjectFactory("Factories.MyFactory,Factories")] [Serializable] public class MyBusinessClass : Csla.baseclass<MyBusinessClass> The parameter passed to the attribute is an assembly-qualified type name for the object factory class. An instance of this class is created by the data portal.

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