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An anonymous method does not explicitly declare a return type. The behavior of the implementation code itself, however, must match the delegate s return type, by returning a value of that type. If the delegate has a return type of void, then the anonymous method code cannot return a value. For example, in the following code the delegate s return type is int. The implementation code of the anonymous method must therefore return an int on all pathways through the code. Return type of delegate type delegate int OtherDel(int InParam); static void Main() { OtherDel del = delegate(int x) { return x + 20 ; }; ... }
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// Returns an int
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Parameters
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Except in the case of array parameters, the parameter list of an anonymous method must match that of the delegate in the following three characteristics: Number of parameters Types of the parameters Modifiers You can simplify the parameter list of an anonymous method by leaving the parentheses empty or omitting them altogether, if both of the following are true: The delegate s parameter list does not contain any out parameters. The anonymous method does not use any parameters. For example, the following code declares a delegate that does not have any out parameters, and an anonymous method that does not use any parameters. Since both conditions are met, you can omit the parameter list from the anonymous method. delegate void SomeDel ( int X ); SomeDel SDel = delegate { PrintMessage(); Cleanup(); }; // Declare the delegate type. // Parameter list omitted
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params Parameters
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If the delegate declaration s parameter list contains a params parameter, then the params keyword is omitted from the parameter list of the anonymous method. For example, in the following code: The delegate type declaration specifies the last parameter as a params type parameter. The anonymous method parameter list, however, must omit the params keyword. Params keyword used in delegate type declaration delegate void SomeDel( int X, params int[] Y); Params keyword omitted in matching anonymous method SomeDel mDel = delegate (int X, int[] Y) { ... };
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Scope of Variables and Parameters
The scopes of parameters and local variables declared in an anonymous method are limited to the body of the implementation code, as illustrated in Figure 15-12. For example, the following anonymous method defines parameter y and local variable z. After the close of the body of the anonymous method, y and z are no longer in scope. The last line of the code would produce a compile error.
Figure 15-12. Scope of variables and parameters
Outer Variables
Unlike the named methods of a delegate, anonymous methods have access to the local variables and environment of the scope surrounding them. Variables from the surrounding scope are called outer variables. An outer variable used in the implementation code of an anonymous method is said to be captured by the method. For example, the code in Figure 15-13 shows variable x defined outside the anonymous method. The code in the method, however, has access to x and can print its value.
Figure 15-13. Using an outer variable
CHAPTER 15 DELEGATES
Extension of Captured Variable s Lifetime
A captured outer variable remains alive, as long as its capturing method is part of the delegate, even if the variable would have normally gone out of scope. For example, the code in Figure 15-14 illustrates the extension of a captured variable s lifetime. Local variable x is declared and initialized inside a block. Delegate mDel is then instantiated, using an anonymous method that captures outer variable x. When the block is closed, x goes out of scope. If the WriteLine statement following the close of the block were to be uncommented, it would cause a compile error, because it references x, which is now out of scope. The anonymous method inside delegate mDel, however, maintains x in its environment and prints its value, when mDel is invoked.
Figure 15-14. Variable captured in an anonymous method This code produces the following output:
Value of x: 5
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