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This section furthers your understanding of OOP using VB 2005. Here you will learn the role of interface types, delegates, and events, and several advanced topics such as operator overloading and custom type conversions. As well, this section dives into the details of a major CTS enhancement brought about with .NET 2.0 generics.

The material in this chapter builds upon your understanding of object-based development by covering the topic of interface-based programming. Here you will learn how to define types that support multiple behaviors, how to discover these behaviors at runtime, and how to selectively hide particular behaviors from an object level. To showcase the usefulness of interface types, the remainder of this chapter examines the System.Collections namespace.

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Quote quote = tickers[ticker] as Quote; if (quote == null) { // Quote doesn't exist. throw new Exception( string.Format("No quotes found for ticker '{0}'", ticker)); } return quote; } } public void PublishQuote(Quote quote) { lock (tickers) { Quote storedQuote = tickers[quote.Ticker] as Quote; if (storedQuote == null) { tickers.Add(quote.Ticker, quote); } else { tickers[quote.Ticker] = quote; } } } } } As you can see, the implementation of the service is simple. It has one member variable (of type Hashtable) that is responsible for keeping the internal state of the service with the provided quotes in memory. In a more realistic scenario, this would of course be kept in some permanent state system (a back end based on a database). To be able to call into the service multiple times, you have to make sure the behavior of the service is a Singleton. Therefore, the ServiceBehavior attribute is applied with the InstanceContextMode property set to InstanceContextMode.Single. You will learn more about behaviors in the Applying Behaviors section. The ReturnUnknownExceptionsAsFaults property is able to track back the exception that can occur when a quote is requested for an unknown ticker to propagate to the client. For obvious reasons, by default WCF doesn t map .NET exceptions across the wire in SOAP faults. In the Introducing the Programming Approach section, you learned the approaches you can take in programming WCF; you also learned that as soon as ServiceHost is there, any attributes and configuration have already been applied. In other words, Listing 3-8 shows the same thing in terms of the actual result, but the one with the configuration is much more maintainable.

The purpose of 10 is to demystify the delegate type. Simply put, a .NET delegate is an object that points to other methods in your application. Using this pattern, you are able to build systems that allow multiple objects to engage in a two-way conversation. After you have examined the use of .NET delegates, you will then be introduced to the VB 2005 Event, RaiseEvent, Handles, and Custom keywords, which are used to simplify the manipulation of programming with delegates in the raw.

One of the many advantages of this embedded player feature is that it gives you the option to allow users to interact with other elements in the app while the selected video plays. The enhanced movie controller also enables developers to change videos without initiating new controllers, overlay additional views on top of the current movie, generate thumbnail images from video frames, control the playback options via code, and much more.

This chapter deepens your understanding of the VB 2005 programming language by introducing a number of advanced programming techniques. We begin with a detailed examination of value types and reference types. Next, you will learn how to overload operators and create custom conversion routines (both implicit and explicit). We wrap up by contrasting the use of CType(), DirectCast(), and TryCast() for explicit casting operations.

Listing 3-8. ServiceHost Instantiation Based on Configuration using using using using System; System.ServiceModel; QuickReturns.StockTrading.ExchangeService; QuickReturns.StockTrading.ExchangeService.Contracts;

As of .NET 2.0, the VB 2005 programming language has been enhanced to support a new feature of the CTS termed generics. As you will see, generic programming greatly enhances application performance and type safety. Not only will you explore various generic types within the System.Collections.Generic namespace, but you will also learn how to build your own generic methods and types (with and without constraints).

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