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

Run(form) This example shows the creation of a simple WinForm in F# Events are synonymous with user interface programming, so I thought it would be good to show an example event of events being used in this context Near the beginning of the example, you create a delegate, stuffHandler, which is then added to the Click event on the button event Later you add a handler directly to the toggle button s Click event, which adds or removes the handler from the button s event..

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Figure 3-18. Cut cable method step 2: strip the individual wires 3. If you want to terminate the cable with a terminal block, fold down the color wire ends (see Figure 3-19). This is a good idea because inserting some insulator along with copper under the terminal screw provides some strain relief as the wire twists around and avoids wire breakage.

I Caution The previous sample will not work in the F# interactive console, fsi, because of the call to

For each function within the file, the profiler records the number of times the function was called; the total amount of time spent within the function; and the minimum, maximum, and average amount of time spent during each call to the function Remember that all performance metrics are recorded in milliseconds The outFigure 7-32 Viewing put is easy to read, and you should be able to quickly determine the Profile menu the areas that may need further performance tuning..

Application.Run. Users of fsi should replace this with form.Visible <- true;;.

Figure 3-19. Cut cable method step 3: fold wire back on insulation 4. Screw the wires in the screw terminal, as shown in Figure 3-20. The first part of the cable should look like Figure 3-21.

Summary

As you saw in 3, pattern matching is a powerful feature of F# Pattern matching allows a programmer to specify that different computations are executed depending on some value F# has a construct that allows pattern matching over NET types The rule to match a NET type is formed from a colon and question mark operator (: ) followed by the name of the NET type to be matched Because it is impossible have an exhaustive list of NET types, you must always provide a default rule when pattern matching over NET types #light let simpleList = [ box 1; box 20; box "three" ] let recognizeType (item : obj) = match item with | : SystemInt32 -> print_endline "An integer" | : SystemDouble -> print_endline "A double" | : SystemString -> print_endline "A string" | _ -> print_endline "Unknown type" List.

The Wait block at the end of the loop sets the time between samples in this case, 15 seconds. The number of samples is set by Until: in the loop count menu shown in Figure 14-3. If the loop count is set to 240 and the time between samples is 15s, the total data logging time is 3,600 seconds, or one hour. When you first try to do data logging, you might want to set Wait to a few seconds and take only a few samples to make sure that everything is working correctly. The sensor used in this example is the LEGO Light Sensor. You could also use the Color Sensor with the Action set for light or even one of the Light Sensors you built from 5. Remember to turn off any light generation the sensor might have or else it will spoil the reading. The first data point is taken immediately when you start the program, so you need to have everything ready at the start.

iter recognizeType simpleList The results are as follows: An integer A double A string This example shows a function, recognizeType, that is designed to recognize three of the NET basic types via pattern matching This function is then applied to a list A couple of details about this function are noteworthy First, the function takes an argument of type obj, and you need to use a type annotation to make sure it does If you didn t use the type annotation, the compiler would infer that the function can take any type and would use type 'a This would be a problem, because you cannot use pattern matching of this kind over F# s types, but only over NET types Second, the function s default case uses the underscore to ignore the value.