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Remote objects, in turn, must be publicly available and bound to a given channel The MarshalByRefObject Class Inheriting from the MarshalByRefObject class is the key that enables user classes to be accessed across AppDomain boundaries in applications that support remoting MarshalByRefObject is the base class for objects that communicate across AppDomains Serializable classes that do not inherit from MarshalByRefObject, when instantiated from a remote assembly, are implicitly marshaled by value Other classes are simply considered nonremotable So if you want to write a remote component that uses the network efficiently and always runs on the server, the only thing you have to do is create the class inheriting from MarshalByRefObject, as follows: public class NorthwindService : MarshalByRefObject 430.

If you need to use a feature that Excel s List command doesn t support, you can temporarily or permanently convert the list to a range. To convert a list to a range, right-click the list, then select List Convert to Range. Alternately, click List on the List toolbar and click Convert to Range. Confirm your choice by clicking Yes when prompted: Do you want to convert your list to a normal range Excel removes the border around the list, deactivates the List toolbar, and turns off the AutoFilter buttons. To convert the data back to a list, follow the directions in the section Creating a New List earlier in this appendix. The only difference is that you want to select the entire range of cells that contain data.

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{ public DataSet GetSalesReport(int year); } For example, the NorthwindService class shown here is ideally suited to act as a remote console that clients access through transparent proxies. Note When creating a remotable object, you normally limit the class to inheriting from MarshalByRefObject. In some situations, however, you might want to override some of the parent class's methods. In particular, you might want to replace the InitializeLifetimeService method and configure the object's lifetime. We'll return to this topic in the section "Memory Management," on page 551.

n 1998, the World Wide Web Consortium (W3C) posted goals for a new language that would facilitate data transfer between computers and systems. According to the goals, the new Extensible Markup Language, or XML, would meet specific criteria. The XML draft document describes a standard language with optional features kept to an absolute minimum, resulting in easy-to-create, human-readable documents. In less than a decade, XML has moved from a set of goals to a language that has undergone frequent and rapid revision. Excel 2003 includes native support for XML (as does Access and InfoPath). In the next version of Office, 2007 Microsoft Office System, every Office application will include native XML support. If you work with SharePoint and Excel, you can t ignore XML.

The ObjRef Class When a MarshalByRefObject object is being remoted, the NET Remoting system packs all the relevant information into an ObjRef object An ObjRef object is a serializable representation of the original MBR object This intermediary object enables the NET Remoting system to transfer an object reference across the boundaries of AppDomains In effect, the entire action of marshaling by reference can be summarized with the creation an ObjRef object An ObjRef object contains information that describes the type and the class of the object being marshaled, the exact location, and any communicationrelated information such as port and protocols The ObjRef instance is created on the server when the MBR object is first referenced; next it is transferred into the target AppDomain, possibly in another process or on another machine.

On the client, the ObjRef object is then deserialized, and the real proxy is created to access the remote instance of the MBR object This operation is globally known as unmarshaling The RealProxy Class RealProxy is an abstract class that represents a remoting proxy Any remoting client transparently uses an instance of this class to issue calls to the remote object The overall NET Framework model for distributed programming is designed to create the illusion that remote objects are actually working locally This is true for NET Remoting as well as for Web services, even though the effect is obtained with radically different techniques Note NET Remoting creates the local instance of the remote object using dynamically created proxies that result from the run-time deserialization process Basically, the deserialization of the ObjRef class generates a transparent proxy to handle user calls.

XML describes data as a hierarchy: a company has departments, departments have employees, employees have first names and last names, and so on. The following simple XML file describes one record an e-mail message:

drag the text box off the canvas. Then you can delete the canvas by selecting it and pressing Delete. You can also disable the drawing canvas by clicking Tools Options and opening the General tab. Deselect Automatically Create Drawing Canvas When Inserting AutoShapes and click OK.

With Web services, a proxy class is statically added to the application's project at design time when the Web service is referenced as an external library The generation of the source code for the class and the subsequent addition to the project are automatically handled by Visual Studio NET However, the wsdlexe utility (part of the NET Framework SDK) allows you to generate the class yourself..

The RealProxy class hidden behind the software creates the illusion that remoting clients actually work locally. The proxy is transparently invoked whenever a method is called on the remote object. The RealProxy class executes the method by forwarding any calls to the real object using the remoting infrastructure. 431

< xml version = "1.0" > <MESSAGE> <TO>nwight@triadconsulting.com</TO> <CC>kmontgomery@boardworks.net</CC> <FROM>gcourter@triadconsulting.com</FROM> <DATE>06/01/06</DATE> <SUBJECT>New Office Location</SUBJECT> <BODY>Where should this item appear on the meeting agenda </BODY> </MESSAGE>

If you want to play with the transparent proxy object yourself, you can get a reference to it by using the following code: RemotingServices.GetRealProxy(localObject); The variable localObject is the local instance of the remote object that you have created using the new operator. (More on this in a moment.) As mentioned, RealProxy is only an abstract class. The actual proxy object belongs to the RemotingProxy class in the System.Runtime.Remoting.Proxies namespace.

Note If you want to try mapping, importing, and exporting XML, enter the preceding text in Notepad and

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