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When a property value has been changed, a specific PropertyChanged event will be raised for that property. If MarkDirty() is called at other times, when a specific property value wasn t changed, then the PropertyChanged event for all object properties should be raised. That way, data binding is notified of the change if any object property is bound to a UI control. To be clear, the goal is to ensure that at least one PropertyChanged event is raised any time the object s state changes. If a specific property were changed, then the PropertyChanged event should be raised for that property. But if there s no way to tell which properties were changed (like when the object is persisted to the database) there s no real option but to raise PropertyChanged for every property. Implementing this requires a couple of overloads of the MarkDirty() method: protected void MarkDirty() { MarkDirty(false); } [EditorBrowsable(EditorBrowsableState.Advanced)] protected void MarkDirty(bool suppressEvent) { _isDirty = true; if (!suppressEvent) OnUnknownPropertyChanged(); } The first overload can be called by a business developer if she wants to manually mark the object as changed. This is intended for use when unknown properties may have changed. The second overload is called by the PropertyHasChanged() method: protected virtual void PropertyHasChanged(string propertyName) { ValidationRules.CheckRules(propertyName); MarkDirty(true); OnPropertyChanged(propertyName); } The PropertyHasChanged() method is called by the business developer to indicate that a specific property has changed. Notice that in this case, any validation rules for the property are checked (the details on this are discussed later in the chapter). Then the object is marked as being dirty by raising the PropertyChanged event for the specific property that was changed.

AssemblyLoad, AssemblyResolve, DomainUnload, ProcessExit, UnhandledException (and others) ErrorDataReceived, Exited, OutputDataReceived (and others) Changed, Created, Deleted, Error, Renamed (and others) BackgroundImageChanged, Click, Disposed, DragDrop, KeyPress, KeyUp, KeyDown, Layout, LostFocus, MouseClick, MouseDown, MouseEnter, MouseHover, MouseLeave, MouseUp, Paint, Resize, TextChanged, Validated, Validating (and others) Tick Elapsed

This method is virtual, allowing you to add extra steps to the process if needed. Additionally, this means you can override the behavior to implement field-level dirty tracking if desired.

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The functions are looking a lot better now. They may have grown in size, but they now assume much less about the markup. I can still see some assumptions being made in the showPic function that I may need to tackle. For instance, I am assuming that the link has a title attribute: var text = whichpic.getAttribute("title"); To find out if there is a title attribute, I can test to see if it isn t equal to null: if (whichpic.getAttribute("title") != null) This if statement will evaluate to true if there is a title attribute. It will return a value of false if there is no title attribute, because the value of whichpic.getAttribute("title") will be equal to null. I can save some space by simply writing if (whichpic.getAttribue("title")) The if statement will still return a value of true as long as there is a title attribute. As a simple fallback, I could set the value of text to be empty if there is no title attribute: if (whichpic.getAttribute("title")) { var text = whichpic.getAttribute("title"); } else { var text = ""; } Here s another way of doing the same thing: var text = whichpic.getAttribute("title") whichpic.getAttribute("title") : ""; The getAttribute test is followed by a question mark. This is called a ternary operator. Two possible values for the variable text are provided after the question mark. The first value will be assigned if

In F#, an event such as form.Click is a first-class value, which means you can pass it around just like any other value. The main advantage this brings is that you can use the combinators in the F# library module Microsoft.FSharp.Control.IEvent to map, filter, and otherwise transform the event stream in compositional ways. For example, the following code filters the event stream from form.MouseMove so that only events with X > 100 result in output to the console: form.MouseMove |> IEvent.filter (fun args -> args.X > 100) |> IEvent.listen (fun args -> printfn "Mouse, (X,Y) = (%A,%A)" args.X args.Y) If you work with events a lot, you will find yourself factoring out useful portions of code into functions that preprocess event streams. Table 8-3 shows some of the functions from the F# IEvent module. One interesting combinator is IEvent.partition, which splits an event into two events based on a predicate.

Calling PropertyHasChanged() by passing the property name as a string value would mean hard-coding the property name in code. String literals are notoriously difficult to maintain, so there s an overload to automatically glean the property name at runtime: [System.Runtime.CompilerServices.MethodImpl( System.Runtime.CompilerServices.MethodImplOptions.NoInlining)] protected void PropertyHasChanged() { string propertyName = new System.Diagnostics.StackTrace().

: ('a -> 'b option) -> #IEvent<'a> -> IEvent<'b> : unit -> ('a -> unit) * #IEvent<'a> : ('a -> bool) -> #IEvent<'a> -> IEvent<'a> : ('b -> 'a -> 'b) -> 'b -> #IEvent<'a> -> IEvent<'b> : ('a -> unit) -> #IEvent<'a> -> unit : ('a -> 'b) -> #IEvent<'a> -> IEvent<'b> : ('a -> bool) -> #IEvent<'a> -> IEvent<'a> * IEvent<'a>

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