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} [event: SomeAttr] // Applied to event [field: SomeAttr] // Applied to compiler-generated field [method: SomeAttr] // Applied to compiler-generated add & remove methods public event EventHandler SomeEvent; }

using System; struct Point : ICloneable { public Int32 x, y; // Override ToString method inherited from System.ValueType public override String ToString() { return String.Format("({0}, {1})", x, y); } // Implementation of ICloneable s Clone method public Object Clone() { return MemberwiseClone(); } } class App { static void Main() { // Create an instance of the Point value type on the stack. Point p; // Initialize the instance s fields. p.x = 10; p.y = 20; // p does NOT get boxed to call ToString. Console.WriteLine(p.ToString()); // p DOES get boxed to call GetType. Console.WriteLine(p.GetType()); // p does NOT get boxed to call Clone. // Clone returns an object that is unboxed, // and its fields are copied into p2. Point p2 = (Point) p.Clone(); // p2 DOES get boxed, and the reference is placed in c. ICloneable c = p2; // c does NOT get boxed because it is already boxed. // Clone returns a reference to an object that is saved in o. Object o = c.Clone(); // o is unboxed, and fields are copied into p.

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Now that you know how to apply a custom attribute, let s find out what an attribute really is . A custom attribute is simply an instance of a type . For Common Language Specification (CLS) compliance, custom attribute classes must be derived, directly or indirectly, from the public abstract System.Attribute class . C# allows only CLS-compliant attributes . By examining the .NET Framework SDK documentation, you ll see that the following classes (from the earlier example) are defined: StructLayoutAttribute, MarshalAsAttribute, DllImportAttribute, InAttribute, and OutAttribute . All of these classes happen to be defined in the System.Runtime.InteropServices namespace, but attribute classes can be defined in any namespace . Upon further examination, you ll notice that all of these classes are derived from System.Attribute, as all CLS-compliant attribute classes must be . Note When applying an attribute to a target in source code, the C# compiler allows you to

omit the Attribute suffix to reduce programming typing and to improve the readability of the source code . My code examples in this chapter take advantage of this C# convenience . For example, my source code contains [DllImport(...)] instead of [DllImportAttribute(...)] .

p = (Point) o; } }

As I mentioned earlier, an attribute is an instance of a class . The class must have a public constructor so that instances of it can be created . So when you apply an attribute to a target, the syntax is similar to that for calling one of the class s instance constructors . In addition, a language might permit some special syntax to allow you to set any public fields or properties associated with the attribute class . Let s look at an example . Recall the application of the DllImport attribute as it was applied to the GetVersionEx method earlier:

This class derives from QObject, as you can tell from the class declaration and the inclusion of Qt s Q_OBJECT declaration at the top of the class declaration. This pulls in code generated by Qt s metaobject compiler. Any class that uses signals or slots must both be declared as a QObject and include the Q_OBJECT declaration.

[DllImport("Kernel32", CharSet = CharSet.Auto, SetLastError = true)]

This code demonstrates several scenarios related to boxing and unboxing: Calling ToString In the call to ToString, p doesn t have to be boxed At first, you d think that p would have to be boxed because ToString is a method that is inherited from the base type, SystemValueType Normally, to call an inherited method, you d need to have a pointer to the type s method table and because p is an unboxed value type, there s no reference to Point s method table However, the C# compiler sees that Point overrides the ToString method, and it emits code that calls ToString directly The compiler knows that polymorphism can t come into play here since Point is a value type and value types can t be used as the base type for any other type Calling GetType In the call to GetType, p does have to be boxed.

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