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Using .NET Generics, the Operations class is implemented as follows: public class Operations< type> { private IMathematics< type> _math; public IMathematics<type> Math { get { if( _math == null) { throw new PropertyNotDefined( "Operations.Math"); } return _math; } set { _math = value; } } public type AddArray( type[] numbers) { type total = this.Math.Reset(); foreach( type number in numbers) { total = this.Math.Add( total, number); } return total; } } In the .NET Generics version of the Operations class, the type has become a parameter that is the base type for the interface IMathematics. The method AddArray has no types and only uses the type employed to define the Operations class. Notice with .NET Generics the Operations class is a pure abstract application logic class, and is type safe. The following test uses the .NET Generics version of the Operations class: [Test]public void AddListDotNet2() { MathBridgeDotNet2.Operations< int> ops = new MathBridgeDotNet2.Operations< int>(); ops.Math = MathBridgeDotNet2.Factory.Instantiate(); int[] values = new int[] {1,2,3,4,5}; Assert.AreEqual( 15, ops.AddArray( values), "List did not add"); } In this test version, the same methods and instantiations are used. The only difference is that the type int is used to convert a Generic type to a specific type. Inspecting the code closer, a potential additional optimization would be to instantiate the types using a factory that is parameterized using a type. An example of such an optimization would be as follows: ops.Math = MathBridgeDoNet2.Factory.Instantiate<int>();

This can be used if you want to specify either only the height or only the width parameter It will also allow you to reset the widget to its original size There is no way to set a widget with a width or height of less than 1 pixel, but by passing 0 to either parameter, GTK+ will make the widget as small as possible Again, it will not be resized so small that it s nonfunctional or unable to draw itself Because of internationalization, there is a danger by setting the size of any widget The text may look great on your computer, but on a computer using a German translation of your application, the widget may be too small or large for the text Themes also present issues with widget sizing, because widgets are defaulted to different sizes depending on the theme.

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Therefore, it is best to allow GTK+ to choose the size of widgets and windows in most cases You can use gtk_widget_grab_focus() to force a widget to grab keyboard focus This will only work on widgets that can handle keyboard interaction One example of a use for gtk_widget_grab_focus() is sending the cursor to a text entry when the search toolbar is shown in Firefox This could also be used to give focus to a GtkLabel that is selectable void gtk_widget_grab_focus (GtkWidget *widget); Often, you will want to set a widget as inactive By calling gtk_widget_set_sensitive(), the specified widget and all of its children are disabled or enabled By setting a widget as inactive, the user will be prevented from interacting with the widget Most widgets will also be grayed out when set as inactive.

if (args->Length < 1) { Console::WriteLine("Enter names on the command line, like this:" " greeting <name1> <name2> ..."); Console::WriteLine("Use quotes around names with spaces."); return 1; } for (int i = 0; i < args->Length; i++) { greet.PrintGreeting(args[i]); } greet.greeting = "Hello, "; greet.punctuator = '.'; for each (String^ s in args) { greet.PrintGreeting(s); } return 0; } As you can see, the type of the array elements is enclosed in angle brackets, and in this case it s a handle to String. Why a handle Because String is a reference type. OK, but why are there two handle symbols The array type is also a reference type, so the outer caret symbol indicates that the argument is a handle to an array. Listing 1-6 also uses the for each statement. The for each statement is the semantic equivalent of the for loop above it. By eliminating the code for counting, bounds checking, and incrementing, the for each statement simplifies performing iteration of an array or other enumerable data structure. In 9, you ll see how to create data structures that allow the use of for each. Also, notice that the program name is not part of the array, as it is in classic C++. The program name is consumed by the CLR, so it is not available to programs through the parameters to main.

In this example, the Factory.Instantiate method has an additional type identifier that would be used to instantiate the correct implementation type. The solution is elegant and rather clever. Consider the following implementation: public class Factory { public static IMathematics Instantiate<type>() { if( typeof( type) is int) { return new ImplIMathematics(); } } } In the implementation of Instantiate, an if block tests which type the Generic .NET parameter is. Then, depending on the type, the appropriate implementation is instantiated. The advantage of this approach is that the Factory class can be extended to support new types without needing the client to be recompiled or changed.

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