winforms code 39

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To create the Object to set the Monitor lock on, simply create a standard static Object: static Object^ MonitorObject = gcnew Object(); You then use this Object along with one of the following two methods to specify the starting point that the Monitor will lock for single thread execution: Enter() method TryEnter() method The Enter() method is the easier and safer of the two methods to use It has the following syntax: static void Enter(Object^ MonitorObject); Basically, the Enter() method allows a thread to continue executing if no other thread is within the code area specified by the Monitor If another thread occupies the Monitor area, this thread will sit and wait until the other thread leaves the Monitor area (known as blocking).

The TryEnter() method is a little more complex in that it has three overloads: static bool TryEnter(Object^ MonitorObject); static bool TryEnter(Object^ MonitorObject, int wait); static bool TryEnter(Object^ MonitorObject, TimeSpan wait); The first parameter is the MonitorObject, just like the Enter() method The second parameter that can be added is the amount of time to wait until you can bypass the block and continue Yes, you read that right The TryEnter() method will pass through even if some other thread is currently in the Monitor area The TryEnter() method will set the start of the Monitor area only if it entered the Monitor when no other thread was in the Monitor area When the TryEnter() method enters an unoccupied Monitor area, it returns true; otherwise, it returns false..

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Represents a concrete class (i.e., a class that can be instantiated directly) Represents an enumeration Represents an interface Represents a class that cannot be instantiated Represents a structure Represents a delegate Represents an inheritance relationship between two classes Represents an association relationship (aggregation or dependency between two classes) A comment regarding the class diagram A VB code module (not available in C#)

This doesn t sound very safe, does it If this method isn t used properly, it isn t safe Why would you use this method if it s so unsafe It s designed to allow the programmer the ability to do something other than sit at a blocked monitor and wait, possibly until the application is stopped or the machine reboots The proper way to use the TryEnter() method is to check the Monitor area If it s occupied, wait a specified time for the area to be vacated If, after that time, it s still blocked, go do something other than enter the blocked area: if (!Monitor::TryEnter(MonitorObject)) { Console::WriteLine("Not able to lock"); return; } //..Got lock go ahead Of course, as you continue into the blocked Monitor area, your code is no longer multithreadsafe Not a thing to do without a very good reason.

One of the main uses for popovers is to present a list of selectable items, not unlike the menus available in Mac OS X and other desktop operating systems. When using menus in a Mac OS X application, the system takes care of things such as making sure that only one menu is shown at a time and making the menu disappear when an item is selected. But the popover in iOS is a different beast. A popover won t automatically disappear when the user selects something inside it, and opening one popover doesn t remove any previously opened popover from the screen. This means that you could easily wind up with multiple popovers on the screen at once, overlapping each other. The only time the system automatically closes a popover is when you touch some part of the screen outside the popover (except, notably, touching an item in a UIToolbar, which leaves the popover just as it is). The rest of the time, you ll need to dismiss the popover yourself any time a user action warrants it. However, this apparent lack of automation actually gives you some amount of flexibility compared to what s typically possible with a menu. A popover can, for instance, contain interactive controls, such as sliders or check boxes, to let the user quickly try out different possibilities and see the results instantly. That wouldn t be possible if the popover went away as soon as someone clicked it. Similarly, allowing multiple popovers

Table 11-3 lists other Class Designer options. These options are accessed either by rightclicking the designer surface or via the Class Diagram menu.

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