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An access modifier determines which class methods including methods of other classes can see and use a member variable or method within a class. Table 7-1 summarizes the C# access modifiers.
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7: Classes and Objects
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Table 7-1. Access modifiers Access modifier
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public private protected
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Restrictions No restrictions. Members that are marked public are visible to any method of any class. The members in class A that are marked private are accessible only to methods of class A. The members in class A that are marked protected are accessible to methods of class A and also to methods of classes derived from class A. The protected access modifier is used with derived classes, as explained in 11. The members in class A that are marked internal are accessible to methods of any class in A s assembly. An assembly is a collection of files that appear to the programmer as a single executable or DLL. The members in class A that are marked protected internal are accessible to methods of class A, to methods of classes derived from class A, and also to any class in A s assembly. This is effectively protected or internal; there is no concept of protected and internal.
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Public methods are part of the class s public interface: they define how this class behaves. Private methods are helper methods used by the public methods to accomplish the work of the class. Because the internal workings of the class are private, helper methods need not (and should not) be exposed to other classes. The Box class and its method DisplayBox( ) are both declared public so that any other class can make use of them. If DisplayBox( ) had been private, you wouldn t be able to invoke DisplayBox( ) from any method of any class other than methods of Box itself. In Example 7-1, DisplayBox( ) was invoked from a method of Tester (not Box), and this was legal because both the class (Box) and the method (DisplayBox) were marked public.
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It is good programming practice to explicitly set the accessibility of all methods and members of your class. Although you can rely on the fact that class members are declared private by default, making their access explicit indicates a conscious decision and is self-documenting.
Method Arguments
The behavior of a class is defined by the methods of that class. To make your methods as flexible as possible, you can define parameters: information passed into the method when the method is invoked. Thus, rather than having to write one method when you want to sort your listbox from A to Z, and a second method when you want to sort it from Z to A, you define a more general Sort( ) method and pass in a parameter specifying the order of the sort. Methods can take any number of parameters. The parameter list follows the method name and is enclosed in parentheses. Inside the parentheses, you provide the type of the parameter and the name that the method will use to refer to that parameter.
Method Arguments
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The terms argument and parameter are often used interchangeably, though some programmers insist on differentiating between the parameter declaration and the arguments passed in when the method is invoked.
For example, the following declaration defines a method named MyMethod( ) that returns void (that is, it returns no value at all) and takes two parameters (an int and a Button):
void MyMethod (int firstParam, Button secondParam) { // ... }
Within the body of the method, the parameters act as local variables, as though you had declared them in the body of the method and initialized them with the values passed in. Example 7-2 illustrates how you pass values into a method; in this case, values of type int and float.
using using using using System; System.Collections.Generic; System.Linq; System.Text;
public class MyClass { public void SomeMethod( int firstParam, float secondParam ) { Console.WriteLine("Here are the parameters received: {0}, {1}", firstParam, secondParam ); } } public class Tester { static void Main( ) { int howManyPeople = 5; float pi = 3.14f; MyClass mc = new MyClass( ); mc.SomeMethod( howManyPeople, pi ); } }
Here is the output:
Here are the parameters received: 5, 3.14
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