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StreamReader^ sr = gcnew StreamReader(FileName); String^ line = nullptr; while (!sr->EndOfStream) { DumpPage(sr, line); ++pagesDumped; if (!sr->EndOfStream) Console::ReadKey(); } sr->Close(); } }; The component implemented here can be used to dump a file page by page to the console. After each page is written, a key is read from the console to ensure that the user can read each part of the file. The property FileName has two attributes. The text passed in the attribute Description is shown in Visual Studio s Properties window when the property FileName is selected. The attribute Category defines which category of the Properties window the property appears in. The attribute Browsable is used to define that the property PagesDumped does not appear in the Properties window. To use the FileDumper in the component designer, you can select Choose Items from the context menu of the Toolbox window and browse to the assembly defining the FileDumper component class. Once this is done, the FileDumper can be picked from the Toolbox window and dropped on another component, and the property FileName can be set. To dump the file, you have to write some code that calls the Dump method on the FileDumper object. Code using the contained components is typically written in methods of the containing class.

If the object is then loaded with data from the database, the _isNew field is set to False, through a protected MarkOld() method: Protected Overridable Sub MarkOld() _isNew = False MarkClean() End Sub

Notice that this process also sets the object to a clean status a concept discussed later in this chapter when I discuss the IsDirty property. When an object s data has just been loaded from the database, it is safe to assume that the object s data matches the data in the database and has not been changed and thus is clean.

Instead of waiting for a key from the console, the FileDumper can do a callback to leave it up to the client what should happen when a full page has been dumped to the console. To do this, the FileDumper component class can provide a PageDumped event. A client can implement the event handler to wait for a keystroke like before, but it would also be an option to display a message box instead. It would even be possible to not handle the event. In this case, one page after the other would be written to the console without an interruption. The callback described here is the typical usage scenario for an event. Events are a special kind of type member that is based on delegates. Delegates are a special kind of type in the CTS that has a lot of similarities to function pointers in C++; they can store information that can be used to call a function. However, delegates support various other features that native function pointers do not have. These features include asynchronous method calls, dynamic method calls, and multicasting. Asynchronous method calls and dynamic delegate invocations are used very seldom in conjunction with event implementations. Therefore, these features are not covered here. For more information on these topics, consult the MSDN documentation for asynchronous delegates and for Delegate.DynamicInvoke.

There s also a corresponding MarkNew() method: Protected Overridable Sub MarkNew() _isNew = True _isDeleted = False MarkDirty() End Sub These methods are normally called automatically by the data portal through the IDataPortalTarget interface, but since they are Protected, they are available to the business object author as well. This allows the business object to change its own state to handle those rare cases where the default behavior is inappropriate. Knowing whether an object is new or old allows for implementation of the data portal in 15. The IsNew property will control the choice of whether to insert or update data into the database. Sometimes, the IsNew property can be useful to the UI developer as well. Some UI behaviors may be different for a new object than for an existing object. The ability to edit the object s primary key data is a good example; this is often editable only up to the point that the data has been stored in the database. When the object becomes old, the primary key is fixed.

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