いくつかの依頼の使い方Action,Func,匿名,マルチキャスト,Lambde表現,eventを整理する
8256 ワード
1.常用委託形式:
例:
例:
public static void Main (string[] args)
{
Meet ("China");
Meet ("Japan");
}
public static void SayHelloInChina()
{
Console.WriteLine (" ？");
}
public static void SayHelloInAmerica()
{
Console.WriteLine ("what is the weather?");
}
public static void SayHelloInJapan()
{
Console.WriteLine (" ！");
}
public static void SayHelloInHanGuo()
{
Console.WriteLine ("…… ");
}
public static void SayHelloInAnyCountry(){}
public static void Meet(string s)
{
if (s == "China")
{
SayHelloInChina ();
}
if (s == "America" )
{
SayHelloInAmerica ();
}
if (s == "Japan")
{
SayHelloInJapan ();
}
if (s == "HanGuo") {
SayHelloInHanGuo ();
}
}
：
public static void Main (string[] args)
{
//
//
Meet(SayHelloInChina); // ，
Meet (SayHelloInHanGuo);
}
public static void SayHelloInChina()
{
Console.WriteLine (" ？");
}
public static void SayHelloInAmerica()
{
Console.WriteLine ("what is the weather?");
}
public static void SayHelloInJapan()
{
Console.WriteLine (" ！");
}
public static void SayHelloInHanGuo()
{
Console.WriteLine ("…… ");
}
public static void SayHelloInAnyCountry(){}
public static void Meet (SayHello say)//
{
say (); //
}
2.
public delegate void kid(); //
class MainClass
{
public static void Main (string[] args)
{
//
Boss boss = new Boss ();
//
kid kid = new kid (boss.Robe);
kid += boss.Kill; // ，
kid += boss.Fire;
//
kid -= boss.Kill;
kid -= boss.Fire;
kid -= boss.Robe;
// ， ，
if (kid != null)
{
kid (); //
}
}
}
//
public class Boss
{
public void Fire(){
Console.WriteLine (" ……");
}
public void Kill()
{
Console.WriteLine (" ……");
}
public void Robe()
{
Console.WriteLine (" ， ……");
}
}
3.
///
///
///
public delegate double DlgtCounter (float a,float b);
class MainClass
{
public static void Main (string[] args)
{
Count ct = new Count ();
// DlgtCounter dcer = new DlgtCounter(ct.Add);
Accountant ac = new Accountant ();
// Console.WriteLine (ac.Operation (dcer, 4f, 5f));
Console.WriteLine (ac.Operation (ct.Add, 3f, 5f));
Console.WriteLine (ac.Operation (ct.Sub, 3f, 5f));
Console.WriteLine (ac.Operation (ct.Mul, 3f, 5f));
Console.WriteLine (ac.Operation (ct.Divide, 3f, 5f));
}
}
///
/// ，
///
public class Accountant
{
// （ ）
public double Operation(DlgtCounter counter,float a, float b)
{
return counter (a, b);
}
}
///
/// ， fgfcr0
///
public class Count
{
public double Add(float a,float b)
{
return a + b;
}
public double Sub(float a,float b)
{
return a - b;
}
public double Mul(float a,float b)
{
return a * b;
}
public double Divide(float a,float b)
{
return a / b;
}
}
4.Action
public static void Main (string[] args)
{
//Action Action
// Action （ ）
Action a = PrintHelloWorld;
a ();
Action b = PrintString;
b ("shenmoyisi");
Action c = PrintDoubleInt;
c (2, 4);
Action d = Print;
d (1, 2, " ", false);
}
public static void PrintHelloWorld()
{
Console.WriteLine ("Hello World.");
}
public static void PrintString(string str)
{
Console.WriteLine (str);
}
public static void PrintDoubleInt(int a, int b)
{
Console.WriteLine (a+ " "+ b);
}
public static void Print(int a, int b, string c, bool d)
{
Console.WriteLine (a+ " " + b+ " " +c+ " " + d);
}
5.Func
//Func ,
//Func ，<> ，
// ， 0~16
class MainClass
{
public static void Main (string[] args)
{
Func a = Test01;
Console.WriteLine (a ());
Func b = Test02;
Console.WriteLine (b (" "));
Func c = Test03;
int res = c (12,45);
Console.WriteLine (res);
}
public static int Test01(){
return 1;
}
public static int Test02(string str)
{
return 2;
}
public static int Test03(int a,int b)
{
return a + b;
}
}
6.
class MainClass
{
public static void Main (string[] args)
{
Action a = Test01;
a += Test02;
// a -= Test01; //
// a -= Test02;
if (a != null) {
a ();
}
// ，
// ， （ ）
// ， void
//
// ， 。
// 。
Delegate[] dlgts = a.GetInvocationList();
//
foreach (Delegate i in dlgts) {
//
i.DynamicInvoke ();
}
}
public static void Test01()
{
Console.WriteLine ("Test01");
// throw new Exception (); // ， ， ， ，
}
public static void Test02()
{
Console.WriteLine ("Test02");
}
}
7.
class MainClass
{
public static int Plus(int a,int b)
{
return a + b;
}
public static void Main (string[] args)
{
//
Func f1 = Plus;
int res1 = f1(12, 34);
Console.WriteLine (" f1 ： "+res1);
// , ， ，
//
Func f2 = delegate (int a, int b) {
return a + b;
};
int res2 = f2 (23, 45);
Console.WriteLine (" f2 ： " +res2);
Func f3 = delegate(int a, int b) {
return a - b;
};
int qwe = f3(4,2);
}
}
8.
Lambda
public static void Main (string[] args)
{
//
Func f2 = delegate (int a, int b) {
return a + b;
};
//Lambda , ，
//Lambda
Func f3 = (arg1, arg2) => {
return arg1 + arg2;
};
// Funcf3 = (arg1, arg2) => arg1 + arg2;
Console.WriteLine (f3(12,12));
//Lambda
// ， return；
//
Funcf4 = arg => 456;
Console.WriteLine ("f4: " + f4(123));
//
// Lambda
//Lambda ,
Func f5 = arg => ++arg;
Console.WriteLine ("f5 : " + f5(13));
Func f6 = asdf => 1234;
int azxc = f6 (" ");
}
}
9.event
public delegate void MyDelegate();
class MainClass
{
//
// public MyDelegate myDelegate;
// ， ， ，
public event MyDelegate myDelegate;
public static void Main (string[] args)
{
MainClass mc = new MainClass ();
mc.myDelegate = Test;
mc.myDelegate ();
}
public static void Test()
{
Console.WriteLine ("Test");
}
}
public delegate void MyDelegete();
class Test01
{
public event MyDelegate MyDelegete01;
public static void Main01(string[] args01){
Test01 t01 = new Test01 ();
t01.MyDelegete01 = Test02;
t01.MyDelegete01 ();
}
public static void Test02()
{
Console.WriteLine (" ");
}
}