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

To halt execution on only the seventh item in the list, first place a breakpoint on the desired line. Then right-click anywhere in that line, and select Breakpoint Properties to open the Breakpoint Properties dialog box. Say you have this simple scenario: you want the breakpoint to actually suspend execution only when you re working with the seventh item in the list, which is the string seven. Enable the conditional breakpoint by checking the When Triggered, Execute checkbox. Within the body of the supplied method, enter a single line of code: return item == "seven"; Thus, the method will return true only when you re working on the seventh item in the list. Finish by checking the Stop If Result Is True radio button, instructing Venkman to suspend execution of the code only when the item is the string seven. Figure 7-21 shows the completed Breakpoint Properties dialog box.

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For simplicity, we built our 2-D Light Sensor using the Mindsensors PCF8591 prototype board. You can find out more about this board in Appendix A. Long pieces of wire insulation have been slipped over the leads of the LDRs in Figure 13-36 to keep them from accidentally connecting to each other. Part of the prototyping area of the board was used to attach the four pull-up resistors. It is critical that you get the input channel and physical direction of the LDRs correct for the light seeker to work.

I introduced compression syntax in 3 for lists and sequences. You can use a corresponding syntax to create arrays. The only difference between this and the functional-style syntax is the characters that delimit the array. You use vertical bars surrounded by square brackets for arrays: #light let chars = [| '1' .. '9' |] let squares = [| for x in 1 .. 9 -> x, x*x |] printfn "%A" chars printfn "%A" squares The results are as follows: [|'1'; '2'; '3'; '4'; '5'; '6'; '7'; '8'; '9'|] [|(1, 1); (2, 4); (3, 9); (4, 16); (5, 25); (6, 36); (7, 49); (8, 64); (9, 81)|]

When the function shown in Figure 7-21 is executed with the conditional breakpoint set, the breakpoint will suspend execution only on the seventh pass through the iteration, when the item variable holds the string seven. This is a powerful technique that could come in handy in numerous scenarios. In addition to the previous example, you may want to suspend execution only every other time the breakpoint is encountered. Implementing this would entail determining whether the __count__ parameter was odd or even by using the modulo (%) operator and the Stop If Result Is True setting. Another 3565005953993bd3170c41194f12907b

Unlike the pseudo-control-flow syntax described in 3, F# does have some imperative control-flow constructs. In addition to the imperative use of if, there are also while and for loops. The major difference from using the if expression in the imperative style, that is, using it with a function that returns type unit, is that you aren t forced to use an else, as the next example demonstrates: #light if System.DateTime.Now.DayOfWeek = System.DayOfWeek.Sunday then print_endline "Sunday Playlist: Lazy On A Sunday Afternoon - Queen"

Figure 13-36. LDRs on Mindsensors PCF8591 prototype board Figure 13-37 shows the 2-D sensor attached on top of the Quick Start Vehicle to make a light-seeking robot.

Though it isn t necessary to have an else expression if the if expression has type unit, you can add one if necessary This too must have type unit, or the compiler will issue an error The next example demonstrates this: #light if SystemDateTimeNowDayOfWeek = SystemDayOfWeekMonday then print_endline "Monday Playlist: Blue Monday - New Order" else print_endline "Alt Playlist: Fell In Love With A Girl - White Stripes" You can use whitespace to detect where an if expression ends The code that belongs to the if expression is indented, and the if expression ends when it goes back to its original indentation So, in the next example, the string "Tuesday Playlist: Ruby Tuesday - Rolling Stones" will be printed on a Tuesday, and "Everyday Playlist: Eight Days A Week - Beatles" will be printed every day of the week #light if SystemDateTimeNow.

example would be to use the Continue Regardless of Result setting and execute some sort of logging functionality each time the breakpoint is encountered. You could even use Ajax techniques to send the logging information to the server!