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You can use the void keyword in your method definition if you do not need to return a result. You can use output parameters to return more than one value from a method; see the Using Output Parameters section earlier in this chapter for details.
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Understanding Method Modifiers
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You can apply modifiers to methods to change the way that they behave or can be used. The following sections discuss the set of C# method modifiers.
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Using Access Modifiers
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The most commonly used modifiers for methods are the access modifiers, which control where your method can be called from. Several modifiers are available, and they allow you to restrict your method so that it can be called only from within the containing class and so they make it available to any other class and a few settings in between. We covered the access modifiers earlier in the chapter. You can see the list of modifiers described in Table 9-2 and some demonstrations of their use in Listings 5-7.
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Most of the methods in the examples so far in this chapter have been instance methods, meaning that you create an instance of a class and then use the dot (.) operator on the name of the object reference and the name of the method that you want to invoke, as follows: MyClass mc = new MyClass(); mc.MyMethod("Hello", "World"); You can also create static methods, which you access using the type name instead of the instance name. Static methods are related to static fields and properties, which we saw in s 7 and 8. In fact, in a static method, you can access only static members of this enclosing class static fields, static properties, and other static methods. A class that has only static members can be made into a static class, which is described in 6. Listing 9-24 contains an example of a static method. Listing 9-24. A Static Method class Calculator { public static int PerformCalculation(int x, int y) { return x * y; } } You create a static method by using the static keyword, as shown in bold in the listing. To access a static method, you would use a statement like this:
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int result = Calculator.PerformCalculation(10, 10);
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Notice that the method is accessed through the class name and not the name of an instance of the class. You don t need to create a new instance of the Calculator class to be able to call the static PerformCalculation method.
Creating Virtual Methods
The virtual keyword can be applied to a method to allow it to be overridden by a derived class. Listing 9-25 contains an example of a virtual method. Listing 9-25. A Virtual Method class Calculator { public virtual int PerformCalculation(int x, int y) { return x * y; } } The virtual keyword is marked in bold in Listing 9-25. Applying this keyword as a modifier to this method means that classes that derive from the Calculator class can override the PerformCalculation method. Virtual methods and method overriding are explained in the Hiding and Overriding Methods section later in this chapter.
Creating Sealed Methods
The sealed modifier is applied to an overridden method and prevents further overriding in derived classes. See the Hiding and Overriding Methods section later in the chapter for details of virtual methods and overriding methods. Listing 9-26 contains a simple example. Listing 9-26. Sealing a Method class Calculator { public virtual int CalculateSum(int x, int y) { return x + y; } public virtual int CalculateProduct(int x, int y) { return x * y; } } class DerivedCalc : Calculator { public sealed override int CalculateSum(int x, int y) { // more specialized implementation of method action/calculation } public override int CalculateProduct(int x, int y) {
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