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{ // Filter the ones we're interested in AssociationConnector connector = selectedObject as AssociationConnector; if (connector != null) { // Navigate to the Association that this Connector presents Association association = connectorSubject as Association; if (association != null) // Just in case { // This same handler is registered for several commands // What we want to do now depends on which command switch (commandCommandIDID) { case AssociationSortBidirectional: associationSort = AssociationSortBidirectional; break; // code for the other cases here } } // else ignore other types in the selection } } // Change every applicable object in the selection transactionCommit(); } } // Don't forget this!



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(7.16), p,q := pvq,q } associativity and idempotence of disjunction } reflexivity of = }

Because C# allows casting down the inheritance chain, it is sometimes desirable to determine what the underlying type is before attempting a conversion Also, checking the type may be necessary for type-specific actions where polymorphism was not implemented To determine the underlying type, C# provides the is operator (see Listing 622)

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The rule is called 'strengthening' because it is used to replace a proof requirement p v q by the stronger requirement q. For example, a programming problem may involve us in establishing the inequality I ^ r. But I ^ r is the same as I < r v I = r. So, rather than establishing l<r we may choose to establish l = r. The requirement I = r is 'stronger' than the requirement I ^ r. A second immediate consequence of the definitions is another strengthening rule: [Strengthening] p <= pAq . (7.21) This is obtained by instantiating q to p A q in (7.16).

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Make changes only to the model (the domain class and domain relationship instances), not their presentation on screen There should be separate rules or event handlers that keep the presentation up to date with the model, and they will be applied when the transaction closes In the Class Diagrams sample, this causes the line-ends to change, because of the custom OnAssociatedPropertyChanged handler in AssociationConnector Generally, de ne a separate pair of handlers for each menu command Share the handlers between menu items (as in the example) only if there is little of the code that varies If the handlers are big and complex, move them into a different class and put the code in a custom code le

Listing 622 encrypts the data if the underlying type is a string This is significantly different from encrypting, simply because it successfully casts to a string since many types support casting to a string, and yet their underlying type is not a string Although this capability is important, you should consider polymorphism prior to using the is operator Polymorphism enables support for expanding a behavior to other data types without modifying the implementation that defines the behavior For example, deriving from a common base type and then using that type as the parameter to the Save() method avoids having to check for string explicitly and enables other data types to support encryption during the save by deriving from the same base type

The advantage of the is operator is that it enables verification that a data item is of a particular type The as operator goes one step further It attempts a conversion to a particular data type and assigns null if the source type is not inherently (within the inheritance chain) of the target type This is significant because it avoids the exception that could result from casting Listing 623 demonstrates using the as operator

Exercise 7.22. Express the strengthening rules for the operator '=>' rather than '<='. Note that turning the arrows around turns a strengthening rule into a weakening rule. D Other immediate consequences are p *= false , true <= p ,

object Print(IDocument document) { if(thing != null) { // Print document } else { } } static void Main() { object data; // Print( data as Document ); }

Don t forget that the current selection may include multiple shapes and connectors of different types

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