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Functions as the primary entry point to the data portal infrastructure, for use by code in business objects Implement the channel adapter pattern to abstract the underlying network protocol from the application Transfer data to and from the server, including security information, application context, the business object s data, the results of the call, and any server-side exception data Expose single points of entry for different server hosts, such as remoting, Web Services, and Enterprise Services Implements transactional and nontransactional data access behaviors, delegating all actual data access to appropriate business objects

All business objects will be implemented to make use of the class-in-charge scheme discussed in 1. Factory methods are used in lieu of the New keyword, which means that it s best to prevent the use of New, thereby forcing the UI developer to use the factory methods instead. The data portal mechanism, as implemented in 4, requires business classes to include a default constructor. As I reviewed the create, fetch, update, and delete processes for each type of object earlier in this chapter, each sequence diagram showed how the server-side data portal created an instance of the business object. This is done using a technique that requires a default constructor. By making the default constructor Private or Protected (and by not creating other Public constructors), you ensure that UI code must use the factory methods to get an instance of any object: ' ... #Region " Factory Methods " Private Sub New() ' require use of factory methods End Sub #End Region ' ... This constructor both prevents the New keyword from being called by code outside this class and provides the data portal with the ability to create the object via reflection. Your classes might also include other constructors, but this one is required for all objects.

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method public void YYY( ) { .. } method public virtual void ZZZ( ) { .. } } method public static void Exec( ) { entrypoint locals init(valuetype XXX xxx) // // ldloca xxx // call instance void XXX::YYY( ) // // // ldloca xxx.

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Treat arrays as collections. Create and use a multidimensional array. Create a multidimensional array where the capacity of each dimension can differ.

The dynamic cast performs a runtime check and returns a nullptr if the type of the casted object does not support the target type Therefore, the preceding code checks if the cast is not nullptr to find out if the cast was successful In the sample code shown here, it is only required to find out if an expression can be casted and the result of a successful cast is not needed In contrast to other languages, C++/CLI does not support an extra construct for this need C#, as an example, has the is operator to find out if an expression is castable to a given type // this is C# code: if ( req is FtpWebrequest ) .. variable req can be casted to an FtpWebRequest .. Even though this C# expression appears to be more expensive than the equivalent C++/CLI expression, the same IL instructions are generated for both cases.

Like many pattern authors, I cringe at persistence There are plenty of pattern books, but so few on data access The problem with data access and persistence is that it s a never-changing debate hence why I was apprehensive of covering it in the first place Frankly, I thought, What can of worms are you getting yourself into, Christian Something interesting happened when I wrote this chapter It turned out that persistence in NET is frighteningly easy I always thought one of the biggest benefits of a managed environment was its ability to garbage collect your objects But it turns out that there is another huge benefit, and that is persistence When I used to code in C and C++, persistence was an absolute pain in the butt, and any change in my application caused my program to come to a grinding halt.

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