C# 匿名函數

委託是一種封裝方法調用的類型。就像類型一樣，可以在方法之間傳遞委託執行個體，並且可以像方法一樣調用委託執行個體。匿名函數是一個“內聯”語句或運算式，可在需要委託類型的任何地方使用。可以使用匿名函數來初始化命名委託，或傳遞命名委託（而不是命名委託類型）作為方法參數。

Lambda 運算式可以綁定到運算式分類樹，也可以綁定到委託。

樣本:

class Test
{
delegate void TestDelegate(string s);
static void M(string s)
    {
        Console.WriteLine(s);
    }

static void Main(string[] args)
    {
// Original delegate syntax required 
// initialization with a named method.
        TestDelegate testdelA = new TestDelegate(M);

// C# 2.0: A delegate can be initialized with
// inline code, called an "anonymous method." This
// method takes a string as an input parameter.
        TestDelegate testDelB = delegate(string s) { Console.WriteLine(s); };

// C# 3.0. A delegate can be initialized with
// a lambda expression. The lambda also takes a string
// as an input parameter (x). The type of x is inferred by the compiler.
        TestDelegate testDelC = (x) => { Console.WriteLine(x); };

// Invoke the delegates.
        testdelA("Hello. My name is M and I write lines.");
        testDelB("That's nothing. I'm anonymous and ");
        testDelC("I'm a famous author.");

// Keep console window open in debug mode.
        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    } 
}
/* Output:
    Hello. My name is M and I write lines.
    That's nothing. I'm anonymous and
    I'm a famous author.
    Press any key to exit.
*/