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Action和Func泛型委托实际上就是一个.NET Framework预定义的委托，3.5引入的特性。基本涵盖了所有常用的委托，所以一般不用用户重新声明。
Action系列泛型委托，是没有返回参数的委托，最多可以有16参数，也可以没有参数；Func系列的委托是有返回值的委托，最多可以有16个参数；
元组是C# 4.0引入的一个新特性，编写的时候需要基于.NET Framework 4.0或者更高版本。元组使用泛型来简化一个类的定义.
提供用于创造元组对象的静态方法。最多可以提供创建新的 8 元组，即八元组。
Action
public delegate void Action()
//void method(); Action test1 = () => { Console.WriteLine("void method();"); }; //void method(x); Action<int> test2 = (x) => { Console.WriteLine("void method(t1)"); }; //void method(x, y); Action<int, int> test3 = (x, y) => { Console.WriteLine("void method(t1, t2)"); };
public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, in T16>()
Func
public delegate TResult Func<out TResult>()
//int method(); Func<int> test4 = () => 10; //int method(x); Func<int, int> test5 = (x) => x * 2; //int method(x,x); Func<int, int, int> test6 = (x, y) => x * y;
public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, in T16, out TResult>()
Tuple
public static Tuple<T1> Create<T1>( T1 item1 ) var tuple1 = Tuple.Create(1); Console.WriteLine(tuple1.Item1); // Displays 1 var tuple1 = new Tuple<int>(1); Console.WriteLine(tuple1.Item1); // Displays 1
Tuple.Create<T1, T2, T3, T4, T5, T6, T7, T8> 方法 (T1, T2, T3, T4, T5, T6, T7, T8) var primes = new Tuple<int, int, int, int, int, int, int, Tuple<int>>(1, 2, 3, 4, 5, 6, 7, new Tuple<int>(8));//元祖里面可以嵌套元祖
Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>> test =
new Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>>(1, 2, 3, 4, 5, 6, 7, new Tuple<int, int, int>(8, 9));
//元祖准确的可以说是当做拥有多个返回值的一种方法，不用使用ref，out了，比较方便。
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原文地址：http://www.cnblogs.com/zhao123/p/5639082.html
