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} else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } public int CalculateSum(int num1, int num2) { // check that the parameters are valid if (CheckRange(num1, num2)) { // number is valid - perform calculation return num1 + num2; } else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } public double CalculateRatio(int num1, int num2) { // check that the parameters are valid if (CheckRange(num1, num2)) { // number is valid - perform calculation return num1 / num2; } else { // throw an exception - the arguments are not valid throw new ArgumentOutOfRangeException(); } } private bool CheckRange(int num1, int num2) { return num1 > 0 && num1 < 100 && num2 > 0 && num2 < 100; } } The class in Listing 9-6 contains a private method called CheckRange, which is called by the other methods. Since this a private method, no other type can use the CheckRange functionality, meaning that I can make changes without breaking other code that depends on MyClass. We can go further and include the exception into the CheckRange method to further reduce duplication, as shown in Listing 9-7. Listing 9-7. Combining Validation and Exception Generation in a private Method using System; class MyClass { public int CalculateProduct(int num1, int num2) { // check that the parameters are valid CheckRange(num1, num2); // perform calculation return num1 * num2; }
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CHAPTER 9 METHODS
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public int CalculateSum(int num1, int num2) { // check that the parameters are valid CheckRange(num1, num2); // perform calculation return num1 + num2; } public double CalculateRatio(int num1, int num2) { // check that the parameters are valid CheckRange(num1, num2); // perform calculation return num1 / num2; } private void CheckRange(int num1, int num2) { if (!(num1 > 0 && num1 < 100 && num2 > 0 && num2 < 100)) { throw new ArgumentOutOfRangeException(); } } } Now we have the range validation and the exception generation in a single private method, allowing us to make changes in one place and affect all the public methods. For more information about the protected keyword, see the Hiding and Overriding Methods section later in the chapter. For information on the other kinds of modifier available, see the Using Method Modifiers section later in the chapter.
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Defining the Method Body
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The statements in a method body are responsible for taking any arguments that have been provided, performing the action described by the method name, producing the method result, and updating the state of your object along the way. The body of a method consists of zero or more code statements.
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CONVENTION: DOING WHAT THE METHOD NAME SUGGESTS
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A powerful convention is that method bodies do what is implied by the method name. If you have a method called CalculateProduct, programmers using your class are going to expect that the method result is the product of the method parameters. If the method does nothing or produces a result that has nothing to do with calculating the product, then you are going to cause problems and confusion.
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If a method doesn t return a result (that is, it is defined using the void keyword), then the simplest method is one that has no parameters, no modifiers, and no code statements, like this:
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CHAPTER 9 METHODS
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void MyMethod() { } If a method does return a result, then the simplest method requires one code statement, which must use the return keyword with an instance of the specified result type or a statement that produces an instance of the result type, such as the following: int MyMethod() { return 2+2; } These are the simplest methods possible, and, of course, they are not especially useful. You can see some more realistic examples of method bodies when we dig into the detail in the Understanding Method Bodies section, later in the chapter.
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