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C# 2.0 introduced anonymous methods, which allowed you to include short bits of inline code when creating or adding to delegates. The syntax for anonymous methods, however, is somewhat verbose and requires information that the compiler itself already knows. Rather than requiring you to include this redundant information, C# 3.0 introduces lambda expressions, which pare down the syntax of anonymous methods. You ll probably want to use lambda expressions instead of anonymous methods. In fact, if lambda expressions had been introduced first, there never would have been anonymous methods. In the anonymous method syntax, the delegate keyword is redundant because the compiler can already see that you re assigning the method to a delegate. You can easily transform an anonymous method into a lambda expression by doing the following: Deleting the delegate keyword. Placing the lambda operator, =>, between the parameter list and the body of the anonymous method. The lambda operator is read as goes to. The following code shows this transformation. The first line shows an anonymous method being assigned to variable del. The second line shows the same anonymous method after having been transformed into a lambda expression, being assigned to variable le1. MyDel del = delegate(int x) { return x + 1; } ; MyDel le1 = (int x) => { return x + 1; } ; // Anonymous method // Lambda expression
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Note The term lambda expression comes from the lambda calculus, which was developed in the 1920s and 30s by mathematician Alonzo Church and others. The lambda calculus is a system for representing functions and uses the Greek letter lambda ( ) to represent a nameless function. More recently, functional programming languages such as Lisp and its dialects use the term to represent expressions that can be used to directly describe the definition of a function, rather than using a name for it.
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This simple transformation is less verbose and looks cleaner, but it only saves you six characters. There s more, however, that the compiler can infer, allowing you to simplify the lambda expression further, as shown in the following code. From the delegate s declaration, the compiler also knows the types of the delegate s parameters, and so the lambda expression allows you to leave out the parameter types, as shown in the assignment to le2. Parameters listed with their types are called explicitly typed. Those listed without their types are called implicitly typed. If there s only a single, implicitly typed parameter, you can leave off the parentheses surrounding it, as shown in the assignment to le3. Finally, lambda expressions allow the body of the expression to be either a statement block or an expression. If the statement block contains a single return statement, you can replace the statement block with just the expression that follows the return keyword, as shown in the assignment to le4. MyDel MyDel MyDel MyDel MyDel del le1 le2 le3 le4 = delegate(int x) { = (int x) => { = (x) => { = x => { = x => return return return return x x x x x + + + + + 1; 1; 1; 1; 1 } } } } ; ; ; ; ; // // // // // Anonymous method Lambda expression Lambda expression Lambda expression Lambda expression
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The final form of the lambda expression has about one fourth the characters of the original anonymous method, and is much cleaner and more understandable.
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The following code shows the full transformation. The first line of Main shows an anonymous method being assigned to variable del. The second line shows the same anonymous method after having been transformed into a lambda expression, being assigned to variable le1. delegate double MyDel(int par); static void Main() { MyDel del = delegate(int x) MyDel MyDel MyDel MyDel le1 le2 le3 le4 = = = = (int x) (x) x x
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{ return x + 1; } ; => { return x + => { return x + => { return x + => x + 1; } ; 1; } ; 1; } ; 1 ;
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