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You can use both positional and named parameters in an invocation, but all the positional parameters must be listed first. For example, the following code shows the declaration of a method called Calc, along with five different calls to the method using different combinations of positional and named parameters: class MyClass { public int Calc( int a, int b, int c ) { return ( a + b ) * c; } static void Main() { MyClass mc = new MyClass( ); int int int int int } } This code produces the following output: 14, 14, 14, 14, 14 Named parameters are useful as a means of self-documenting a program, in that they can show, at the position of the method call, what values are being assigned to which formal parameters. For example, in the following two calls to method GetCylinderVolume, the second call is a bit more informative and less prone to error. class MyClass { double GetCylinderVolume( double radius, double height ) { return 3.1416 * radius * radius * height; } static void Main( string[] args ) { MyClass mc = new MyClass(); double volume; r0 r1 r2 r3 r4 = = = = = mc.Calc( mc.Calc( mc.Calc( mc.Calc( mc.Calc( 4, 4, 4, c: c: 3, b: c: 2, 2, 2 ); 3, c: 2 ); 2, b: 3 ); b: 3, a: 4 ); b: 1 + 2, a: 3 + 1 ); // // // // // Positional Parameters Positional and Named Parameters Switch order All named parameters Named parameter expressions
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Console.WriteLine("{0}, {1}, {2}, {3}, {4}", r0, r1, r2, r3, r4);
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volume = mc.GetCylinderVolume( 3.0, 4.0 ); ... volume = mc.GetCylinderVolume( radius: 3.0, height: 4.0 ); ... } } More informative
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Another feature introduced in C# 4.0, is called optional parameters. An optional parameter is a parameter that you can either include or omit when invoking the method. To specify that a parameter is optional, you need to include a default value for that parameter in the method declaration. The syntax for specifying the default value is the same as that of initializing a local variable, as shown in the method declaration of the following code. In this example: Formal parameter b is assigned the default value 3. Therefore, if the method is called with only a single parameter, the method will use the value 3 as the initial value of the second parameter.
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class MyClass Optional Parameter { public int Calc( int a, int b = 3 ) { return a + b; } static void Main() { MyClass mc = new MyClass(); int r0 = mc.Calc( 5, 6 ); int r1 = mc.Calc( 5 ); } } This code produces the following output: 11, 8 // Use explicit values. // Use default for b. Default Value Assignment
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Console.WriteLine( "{0}, {1}", r0, r1 );
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There are several important things to know about declaring optional parameters: Not all types of parameters can be used as optional parameters. You can use value types as optional parameters as long as the default value is determinable at compile time. You can only use a reference type as an optional parameter if the default value is null.
Figure 5-12. Optional parameters can only be value parameter types. All required parameters must be declared before any optional parameters are declared. If there is a params parameter, it must be declared after all the optional parameters. Figure 5-13 illustrates the required syntactic order.
Figure 5-13. In the method declaration, optional parameters must be declared after all the required parameters and before the params parameter, if one exists.
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As you saw in the previous example, you use the default value of an optional parameter by leaving out the corresponding actual parameter from the method invocation. You can t, however, omit just any combination of optional parameters because in many situations it would be ambiguous as to which optional parameters to use. The rules are the following: You must omit parameters starting from the end of the list of optional parameters and work toward the beginning. That is, you can omit the last optional parameter, or the last n optional parameters, but you can t pick and choose to omit any arbitrary optional parameters; they must be taken off the end.
class MyClass { public int Calc( int a = 2, int b = 3, int c = 4 ) { return (a + b) * c; } static void Main( ) { MyClass mc = new MyClass( ); int r0 = mc.Calc( 5, 6, 7 ); int r1 = mc.Calc( 5, 6 ); int r2 = mc.Calc( 5 ); int r3 = mc.Calc( ); } } This code produces the following output: 77, 44, 32, 20
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