C#中委托的发展与匿名函数
匿名函数(C# 编程指南)
匿名函数是一个“内联”语句或表达式,可在需要委托类型的任何地方使用。 可以使用匿名函数来初始化命名委托,或传递命名委托(而不是命名委托类型)作为方法参数。
共有两种匿名函数,以下主题中分别讨论了这些函数:
C# 中委托的发展
下面的示例演示从 C# 1.0 到 C# 3.0 委托创建过程的发展:
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. */
.net3.5之后,大部分时候匿名方法可以被lambda替代。
地址:https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/statements-expressions-operators/anonymous-methods
搜索:匿名方法(C# 编程指南)