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An object is considered to be dirty, or changed, when the values in the object s fields do not match the values in the database. If the values in the object s fields do match the values in the database, the object is not dirty. It is virtually impossible to always know whether the object s values match those in the database, so the implementation shown here acts on a best guess. The implementation relies on the business developer to indicate when an object has been changed and thus has become dirty. A similar but related concept is that an object is considered dirty if it or any of its child objects have been changed. That concept is reflected by the IsDirty property, which is different from IsSelfDirty that reflects the status of only this specific object (not counting its child objects). The current status of the value is maintained in a field: Private _isDirty As Boolean = True The value is then exposed as a property: <Browsable(False)> _ Public Overridable ReadOnly Property IsSelfDirty() As Boolean Get Return _isDirty End Get End Property Notice that this property is marked as Overridable. This is important because sometimes a business object isn t simply dirty because its data has changed. In this case, the business developer will need to override the IsSelfDirty property to provide a more sophisticated implementation.

To understand delegates, it is helpful to first concentrate on the similarity to C++ function pointers. In C++, there are two function pointer concepts. From its C roots, C++ inherits the normal function pointer. A typedef for such a function pointer typically looks like this: // PFN is a pointer to a boolean function with an int argument typedef bool (*PFN)(int); Such a function pointer can target global functions and static functions of native C++ classes. To target non-static functions of native C++ classes, a second pointer concept is necessary, since non-static functions have a hidden argument for the this pointer. This kind of function pointer is called a pointer-to-member function. The following code shows two such pointers, one for member functions of a native type T1 and one for a type T2: // PT1FN is a pointer to a boolean member function of T1 with an int argument typedef bool (T1::*PT1FN)(int); // PT2FN is a pointer to a boolean member function of T2 with an int argument typedef bool (T2::*PT2FN)(int); Delegates unify the concept of C function pointers and C++ pointers-to-member functions. The syntax to define delegates is very similar to the native function pointer syntax. public delegate void SampleDelegate(int); For this one line of code, the C++/CLI compiler generates a type, as shown in Figure 5-8.

Although changing the behavior of IsSelfDirty is a rare scenario, the feature was requested numerous times by the community, so the property was made Overridable.

Figure 5-8. A delegate type under the hood As this figure shows, the generated SampleDelegate has a constructor (named .ctor) that expects a tracking handle to any object, and a native int (a type of the native pointer size). If the target function is a global function or a static function, a nullptr is expected. For nonstatic functions, a tracking handle to the target object is expected. The second argument is used to pass a pointer to the target function. The following code implements a global and a non-static target function and instantiates a delegate for both targets: // delegates.cpp // compile with "cl /clr:safe delegates.cpp" public delegate bool SampleDelegate(int); bool GlobalTargetFunction(int i) {

The IsSelfDirty property defaults to True because a new object s field values won t correspond to values in the database.

If the object s values are subsequently loaded from the database, the _isDirty value is changed to False when MarkOld() is called because MarkOld() calls a MarkClean() method: <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Sub MarkClean() _isDirty = False If _fieldManager IsNot Nothing Then FieldManager.MarkClean() End If OnUnknownPropertyChanged() End Sub This method not only sets the _isDirty value to False but also calls MarkClean() on the FieldManager to mark all the fields it contains as being unchanged. Once the object and its fields are marked as unchanged, this method calls the OnUnknownPropertyChanged() method implemented in Csla.Core.BindableBase to raise the PropertyChanged event for all object properties. This notifies data binding that the object has changed, so WPF and Windows Forms can refresh the display for the user. I discuss the BindableBase class and data binding in 10.

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