Simple .NET/ASP.NET PDF document editor web control SDK

Events are special properties of objects that allow functions to be attached to them The functions that are attached to events are sometimes referred to as handlers When the event occurs, it executes all the functions that have been attached to it An example of this might be that a Button object exposes a Click event, which occurs when a user clicks the button This would mean that any functions that have been attached to the button s Click event would execute when the button is clicked This is extremely useful, since it s common to need notifications of what the user has done when creating user interfaces Adding a hander to an event is fairly straightforward Each event exposes a method called Add, and the handling event is passed to this method.

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Venkman keeps track of the current call stack in the Call Stack window (see Figure 7-30). This window simply shows a stack of the function call list. The function at the top of the stack is the current function; the next function in the list is the one that called the function at the top of the list, and so on. This window is useful when you have a complicated call structure and you want to see the order in which functions are called. Double-clicking an item in the Call Stack window will bring the view in the Source Code window to the function represented by the clicked item in the call stack. The Local Variables list will update itself to show the variables in context within that function. Note that this doesn t actually change the order of execution you ve merely moved to see where you ve been, but it doesn t change where you re going. Figure 7-30. Venkman s Call Stack window

For this method, remove the latch from a standard RJ-12 and its support by filing, as shown in Figures 312 and 3-13. Then wrap the plug with some cellophane tape so that it fits snugly in the NXT connector. This operation is illustrated in Figure 3-14. The sides and the top must be covered, but obviously not the bottom that contains the contacts. The method is simple, but not very reliable because there is no lock and it can be easily pulled out.

Events come from non-F# libraries, so the Add method follows the convention that its arguments must be surrounded by parentheses In F# it is common to place the handler function inside the Add method itself using F# s anonymous function feature The type of the handler function must match the type of the Add method s parameter, and this parameter has type 'a -> unit This means that for events exposed by objects in the BCL, the parameter of the Add method will have a type similar to EventArgs -> Unit The next example shows the creation of a Timer object and a function being added to the timer s Elapsed event A Timer object is an object that will fire its Elapsed event at regular intervals In this case, the handler will show a message box displaying a notice to the user.

As you become more comfortable with Ajax techniques, you re likely to write more JavaScript than you have previously, especially if you decide to host more application logic on the browser. Doing so raises the possibility that you ll at some point encounter performance bottlenecks within the JavaScript code. Sound software development practices teach that there is no point in optimizing code for performance unless a performance problem exists in the first place. Optimized code is almost always harder to read and maintain than code that is not optimized, so unless you truly need to optimize code for performance, avoid doing so.

Philo pioneered the RJ-12 surgery method. The latch is cut, trimmed, and glued back on at the right place. The sliced RJ-12 connector is shown in Figure 3-15. This method is more delicate, but the connectors are more reliable. You can find a complete how-to on Philo s web site: http://philohome.com/nxtplug/nxtplug.htm.

Notice how you do not care about the argument that will be passed to the handler function, so you ignore it using the underscore #light open SystemTimers module WF = SystemWindowsForms let timer = let temp = new Timer() tempInterval <- 30000 tempEnabled <- true let messageNo = ref 0 tempElapsedAdd(fun _ -> let messages = ["bet"; "this"; "gets"; "really"; "annoying"; "very"; "quickly";] WFMessageBoxShow(Listnth messages !messageNo) |> ignore messageNo := (!messageNo + 1) % (Listlength messages)) temp.