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Here is the output for Listing 7-12: Return Return Return Return value value value value was was was was R::h R::h R::f R::h

Note The value available in the properties of the messages will be equal to the namespace given the SOAP

Header schema. In this project, it was set to CreatingSOAPHeaders; therefore, all of the properties will be listed, as shown in Figure 2 45.

The output shows us that, in reality, the last function added is the one whose value is returned. But since this is implementation-defined, we should heed the warning and always use a manual walk of the invocation list with these delegates. Using GetInvocationList is also useful if exceptions might be thrown by the functions called through the delegate. If one delegate function throws an exception, other target functions may never execute. Walking through the invocation list manually enables you to wrap each invocation in a try/catch block, giving you more control over the functions that are invoked. Listing 7-13 demonstrates this technique. Listing 7-13. Manually Walking Through an Invocation List // delegate_with_exceptions.cpp using namespace System; delegate String^ MyDelegate(); ref class R { public: String^ f() { throw gcnew Exception(); return "R::f"; } String^ g() { return "R::g"; } String^ h() { return "R::h"; } }; int main() { MyDelegate^ d; R^ r = gcnew R(); d = gcnew MyDelegate(r, &R::f); d = safe_cast<MyDelegate^>(d->Combine(d, gcnew MyDelegate(r, &R::g))); d = safe_cast<MyDelegate^>(d->Combine(d, gcnew MyDelegate(r, &R::h))); for each (MyDelegate^ del in d->GetInvocationList()) {

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The project accompanying this recipe (CreatingSOAPHeaders) demonstrates the practical application of the SOAP Header. The basic architecture of the solution is this: Primary orchestration receives an incoming document from a file receive location.

Orchestration sets the promoted SOAP Header properties in a Message Assignment shape. Orchestration delivers the message to the BizTalk MessageBox via direct binding on a port. A secondary orchestration subscribes to the MessageBox and is instantiated when a document matching the schema it is subscribing to arrives. The secondary orchestration reads the values of the SOAP Header and writes them to the Windows event viewer.

try { String^ s = del->Invoke(); Console::WriteLine("Return value was {0}", s); } catch(Exception^) { // Handle the exception. } } } The output of Listing 7-13 is shown here: Return value was R::g Return value was R::h Without the try/catch, g and h would never have been called.

Figure 2 46 illustrates the flow of the primary orchestration and the use of a Message Assignment shape to set the SOAP Header properties before delivering to the MessageBox (port_2 is direct binding).

Figure 2 46. Sample solution primary orchestration The secondary orchestration subscribes to the MessageBox and writes the values of the SOAP Header properties to the Windows Event Log. Figure 2 47 shows the secondary orchestration.

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