长沙做网站智投未来,登录注册网站怎么做,广西网站建设工具,中国建设银行卖狗年纪念币官方网站C#在System命名空间下提供两个委托Action和Func#xff0c;这两个委托最多提供16个参数#xff0c;基本上可以满足所有自定义事件所需的委托类型。几乎所有的 事件 都可以使用这两个内置的委托Action和Func进行处理。
Action委托#xff1a;
Action定义提供0~16个参数这两个委托最多提供16个参数基本上可以满足所有自定义事件所需的委托类型。几乎所有的 事件 都可以使用这两个内置的委托Action和Func进行处理。
Action委托
Action定义提供0~16个参数无返回值的委托
共有17种重载
public delegate void Action();
public delegate void Actionin T(T obj);
public delegate void Actionin T1, in T2(T1 arg1, T2 arg2);
public delegate void Actionin T1, in T2, in T3(T1 arg1, T2 arg2, T3 arg3);
。。。。。。
public delegate void Actionin 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(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14);
public delegate void Actionin 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(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15);
public delegate void Actionin 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(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15, T16 arg16); Func委托
Func定义提供0~16个参数有返回类型的委托
共有17种重载
public delegate TResult Funcout TResult();
public delegate TResult Funcin T, out TResult(T arg);
public delegate TResult Funcin T1, in T2, out TResult(T1 arg1, T2 arg2);
public delegate TResult Funcin T1, in T2, in T3, out TResult(T1 arg1, T2 arg2, T3 arg3);
。。。。。。
public delegate TResult Funcin 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, out TResult(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14);
public delegate TResult Funcin 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, out TResult(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15);
public delegate TResult Funcin 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(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15, T16 arg16); Action、Func委托与常见委托的类比
线程开始委托
public delegate void ThreadStart();
System.Threading.ThreadStart 委托 类似于 Action
事件处理委托
public delegate void EventHandler(object sender, EventArgs e);
EventHandler 委托 类似于 Actionobject,EventArgs
判定委托
public delegate bool Predicatein T(T obj);
PredicateT 委托 类似于 FuncT,bool
比较委托
public delegate int Comparisonin T(T x, T y);
ComparisonT 委托 类似于 FuncT, T, int
测试程序
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace IntegratedDelegateDemo
{class Program{static void Main(string[] args){//Action定义无返回值的委托最多有16个参数//Func定义一个有返回值的委托最多有16个参数Predicateint predicate x x 0;Funcint, bool func new Funcint, bool(predicate);Comparisondouble comparison (x, y) x - y 0 ? 1 : 0;int num -8;bool isPositive func(num);Console.WriteLine($【{num}】是否为正数:【{isPositive}】);Funcdouble, double, int funcComparion new Funcdouble, double, int(comparison);double xNumber 7.666;double yNumber 6.55;Console.WriteLine($两个数字进行比较【{xNumber}】【{yNumber}】的结果为【{funcComparion(xNumber, yNumber)}】);Liststring gjqtList new Liststring() { 百里屠苏, 风晴雪, 红玉, 方兰生 };gjqtList.ForEach(role Console.WriteLine(role));Action action () Console.WriteLine(测试无参数无返回值委托);System.Threading.ThreadStart threadStart new System.Threading.ThreadStart(action);threadStart.Invoke();Funcshort, short, int funcComparison (x, y) y - x;Comparisonshort comparisonDesc new Comparisonshort(funcComparison);short[] testSortArray new short[] { 50, 25, 43, 69, 16, 14, 22 };Console.WriteLine($使用委托进行逆序排序原数组为【{string.Join(,, testSortArray)}】);Array.Sort(testSortArray, comparisonDesc);Console.WriteLine($逆序排序已结束逆序排序后的数组为【{string.Join(,, testSortArray)}】);Console.ReadLine();}}
}运行截图
