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I haven t specifically said anything so far about nested classes, but they work in C++/CLI in the same way that they work in classic C++ The nesting makes the implementation more tidy, since otherwise we would need a forward declaration or some out-of-line definitions, since Cards and CardEnumerator both reference each other Third, we create a snapshot of the collection before iterating over it This is an often neglected but very important part of implementing IEnumerable Enumerating a collection when the collection changes invalidates the enumeration There are a couple of ways of dealing with this One is to create a snapshot of the collection at the time enumeration starts This could be slow depending on how it is done A faster way would be to add a Boolean field, changed, and set it to true in the methods that change the collection, such as the Shuffle method.

Caution BizTalk may not be able to recognize the second schema if the project name begins with a number.

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BizTalk developers often think about translation among message types when defining integration processes in an orchestration They can place a Transform shape directly within an orchestration to transform a message into different formats, so it seems that the transformation and orchestration are integral to each other However, the BizTalk mapper cannot directly access the contextual information of the business process and the logic existing in the orchestration The BizTalk Mapper can natively access many resources outside the map with the default functoids For example, the Database Lookup functoid can access records in a database, and the Scripting functoid can invoke an external assembly However, the most direct way to access information about the context of the business process is by creating a message specifically for capturing the state of the business process.

Then, the MoveNext and Current properties check this field, and if it is set, they throw an InvalidOperationException When you see how to implement a generic linked list in 11, you ll encounter the latter method The two methods produce somewhat different runtime behavior With the snapshot method, we can call methods that modify the collection, and they will affect the original collection, but not the copy we are interating over With the other method, an InvalidOperationException is generated whenever the collection is modified Listing 9-15 Enumerating Playing Cards // cards_enumerablecpp using namespace System; using namespace System::Text; using namespace System::Collections; enum class SuitEnum { Diamonds, Clubs, Hearts, Spades };.

Add the information required in the mapping to this additional message, and then add the context message as an additional input message to the map The possible reasons for passing information from an orchestration into a mapping with a second message are as varied as the capabilities of BizTalk orchestrations However, in all cases, the mapping destination message must contain information that cannot or should not be added to the schema of the input message Here are some examples: A standards body such as RosettaNet sets the source message schema, and it should not change The mapping must access message context properties A map cannot access these values For example, if the SMTP adapter is used, an orchestration can access the sender with the SMTPFrom property but not directly from the BizTalk Mapper The destination message may need this information.

The mapping must include information about the business process that is not known until runtime and is required in the orchestration Rather than duplicating the logical definitions, define each definition once within the orchestration and pass the information to the mapping..

// represents a playing card value struct Card { SuitEnum Suit; unsigned int Rank; literal int CHAR_HEART = 3; // ANSI heart character literal int CHAR_DIAMOND = 4; // ANSI diamond literal int CHAR_CLUB = 5; // ANSI club literal int CHAR_SPADE = 6; // ANSI spade // Render the two-character card using ANSI card values. virtual String^ ToString() override { StringBuilder^ s = gcnew StringBuilder(); if (Rank <= 0 || Rank > 13) throw gcnew InvalidOperationException(); else if (Rank < 11) { s->Append(Rank); } else { switch (Rank) { case 11: // Jack s->Append("J"); break; case 12: // Queen s->Append("Q"); break; case 13: // King s->Append("K"); break; default: throw gcnew InvalidOperationException(); } } switch (Suit) { case SuitEnum::Clubs: s->Append(CHAR_CLUB, 1); break; case SuitEnum::Hearts: s->Append(CHAR_HEART, 1); break;

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