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Message(DateTime dt, String^ from, String^ subject, String^ body) { DateReceived = dt; From = from; Subject = subject; Body = body; } virtual int CompareTo(Message^ msg) { switch ( SortCriterion ) { case SortByEnum::SortByDate: return this->DateReceived.CompareTo(msg->DateReceived); case SortByEnum::SortByFrom: return this->From->CompareTo(msg->From); case SortByEnum::SortBySubject: return this->Subject->CompareTo(msg->Subject); default: throw gcnew InvalidOperationException(); } } // other methods... }; // Print the message headers in sorted order. void PrintHeaders(array<Message^>^ messages, SortByEnum sortOrder) { Message::SortCriterion = sortOrder; Array::Sort(messages);

In this chapter I discussed how CSLA .NET supports important parent-child interactions, including the following: IsValid IsDirty Change events Parent reference N-level undo s 10 through 16 continue the coverage of the implementation of CSLA .NET. Then, from 17 on, the focus is on building the simple business application designed in 3 to illustrate how the classes in the framework can be used to build applications based on business objects.

Summary

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Similarly, the data retrieval operations are duplicated: private void DataPortal_Fetch(RootCriteria criteria) { // TODO: create data reader to load values using (SqlDataReader dr = null) { DoFetch(dr); } } private void Fetch(SqlDataReader dr) { MarkAsChild(); DoFetch(dr); } private void DoFetch(SqlDataReader dr) { // TODO: load values } If the object is being loaded from the UI, then it is treated as a root object and DataPortal_ Fetch() is called, passing in appropriate criteria. This method opens the database, and sets up and executes a database command object to get back a data reader. That data reader is then passed to a central DoFetch() helper method to copy the data from the data reader into the object s fields. On the other hand, if the object is being loaded from a parent object as a child, then its parameterized constructor is called, which in turn calls the Fetch() method. This method calls MarkAsChild() to mark the object as a child, and then the DoFetch() helper is called to copy the data from the data reader into the object s fields.

When building a Windows Forms UI, it is critical that these methods be called only when the object is not data bound to the UI.

http://127.0.0.1:10001/myaccount/ myqueue comp=metadata http://127.0.0.1:10001/myaccount/ myqueue/messages http://myaccount.queue.core. windows.net/myqueue/messages peekonly=true http://127.0.0.1:10001/myaccount/ myqueue/messages/messageid popreceipt =string-value"lightweight commit" http://myaccount.queue.core. windows.net/myqueue/messages Deletes all the messages in the queue

The statement in Listing 13-4 has assigned a string array with a capacity for five objects to a variable called nameArray, which has been defined as an array of objects. This is an example of upcasting, which is explained in 6.

12. Press F6 to go back to the Design workspace. 13. Now we need to move to Visual Studio to wire up the functionality. In the Project panel, rightclick the Solution and left-click Edit in Visual Studio, as shown in Figure 2-69.

Summary

#pragma managed (push, off) int f() { int i = 1; return 1 / --i; } #pragma managed (pop) int main() { __try { f(); } __except(GetExceptionCode() == EXCEPTION_INT_DIVIDE_BY_ZERO EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { System::Console::WriteLine("Divide by zero exception"); } return 0; } This code shows the three parts of Win32 SEH: a try block, an exception filter, and an exception handler. When an exception is thrown in the try block, the exception filter is evaluated. This exception filter is an expression that is used to determine how the exception handling proceeds. If it returns EXCEPTION_EXECUTE_HANDLER, then the handler is executed. EXCEPTION_CONTINUE_SEARCH means that the exception is not handled and other filters on the call stack are checked. The IL code generated from the preceding C++/CLI code shows how main is separated into the try block, exception filter, and exception handler. .method assembly static int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) main() cil managed { .maxstack 2 .locals (int32 filterResult) begin_: call int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) f() pop leave return_ theFilter_: pop // GetExceptionCode() == EXCEPTION_INT_DIVIDE_BY_ZERO // EXCEPTION_EXECUTE_HANDLER :

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