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Use of XML in the .NET Framework
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p until now, you have learned how to work with your own XML data. This includes reading, writing, validating, serializing, and querying XML data. However, Microsoft has used XML extensively in the .NET Framework. The most significant area where XML is used extensively is in application configuration. Further, ASP.NET makes heavy use of XML for representing server controls and data binding. Understanding the use of XML in the .NET Framework is therefore essential for any .NET developer. This chapter introduces you to many of these features. Specifically, you will learn about the following topics: Remoting How XML is used in a remoting configuration ASP.NET server controls Use of XML in representation of server controls The XML data source control Navigational controls of ASP.NET such as TreeView, Menu, and SiteMap The XML server control Website configuration files and XML Note that although this chapter covers topics such as remoting and server controls, by no means does it give an exhaustive treatment to these topics. The focus here is to learn how XML is used in various areas of the .NET Framework.
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Understanding Remoting
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The concept of distributed applications is not new. For years companies have invented their own ways to develop distributed applications. As far as Microsoft is concerned, Distributed Component Object Model, or DCOM, was the main technology pillar for developing distributed applications during COM days. In the .NET Framework, they introduced remoting. You
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CHAPTER 11 US E OF XML IN THE .N ET FRA MEWORK
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can think of remoting as the substitute for DCOM under the .NET Framework. However, remoting is much more flexible and powerful than DCOM for the following reasons: Remoting provides open architecture that allows you to customize and extend it easily. Remoting allows you to customize the format of communication. Remoting allows you to customize the communication channel on which the applications talk with each other. Remoting doesn t require a specific port range for communication. Remoting can be used easily in web-based scenarios also. Now that you have brief idea about remoting, you re ready to try to understand its general architecture.
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Remoting Architecture
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The overall remoting architecture is shown in Figure 11-1.
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Figure 11-1. Remoting architecture Every .NET application has a security and isolation boundary. Traditionally, this boundary is provided by the operating system in the form of a process. In the .NET Framework, however, this boundary is provided by the Common Language Runtime (CLR) and is called the application domain, or app domain for short. Two .NET app domains (or applications) cannot talk to each other directly for the sake of obvious security and isolation reasons. If you wish to communicate between two app domains, you need a proxy and marshalling infrastructure.
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C HA PTER 11 USE O F XML I N T HE .NET F RAME WO RK
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Fortunately, the .NET Framework provides all the necessary infrastructure to achieve this communication. Figure 11-1 shows a remote object being consumed by a client application. The client application is loaded in its own app domain. Similarly, the server object is loaded in its own app domain. Before the remote object (often called a server) can be consumed, it must be activated on the server. Activation is a process by which the remote object is published and made available on a network, and the remoting infrastructure must be present at both ends of the .NET Framework. When the client wishes to call any method of the remote object, it does so via a proxy. The proxy marshals the method call to the remote server. The remote object then executes it and marshals the return value back. Again, the proxy acts as a middleman and conveys the results back to the client application. The data marshalled from one application to the other is transferred over a communication channel. Typically this channel will be TCP or HTTP.
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