CC# 面向?qū)ο蟪绦蛟O(shè)計(jì)SCH6

1第6章委托和事件委托和方法2委托封裝方法委托類型定義delegatevoidDualFunction(intx,inty);publicstaticvoidAdd(intx,inty){Console.WriteLine("{0}+{1}={2}",x,y,x+y);}與要綁定的方法原型一致委托和方法3委托封裝方法委托類型定義委托對象創(chuàng)建delegatevoidDualFunction(intx,inty);publicstaticvoidAdd(intx,inty){Console.WriteLine("{0}+{1}={2}",x,y,x+y);}publicstaticvoidMain(){DualFunctionfun1=newDualFunction(Add);}委托和方法4委托封裝方法委托類型定義委托對象創(chuàng)建調(diào)用方法delegatevoidDualFunction(intx,inty);publicstaticvoidAdd(intx,inty){Console.WriteLine("{0}+{1}={2}",x,y,x+y);}publicstaticvoidMain(){DualFunctionfun1=newDualFunction(Add);Add(1,2);fun1(1,2);}與一般方法調(diào)用格式相同委托和方法5委托封裝方法DualFunctionfun1=newDualFunction(Add);

fun1AddvoidAdd{intx,inty)......voidSub{intx,inty)......voidMul{intx,inty)......委托和方法6委托封裝方法DualFunctionfun1=newDualFunction(Add);fun1(2,3);

fun1AddvoidAdd{intx,inty)......voidSub{intx,inty)......voidMul{intx,inty)......委托和方法7委托封裝方法DualFunctionfun1=newDualFunction(Add);fun1(2,3);fun1=newDualFunction(Sub);

fun1AddvoidAdd{intx,inty)......voidSub{intx,inty)......voidMul{intx,inty)......委托和方法8委托加減DualFunctionfun1=newDualFunction(Add);fun1(2,3);fun1=newDualFunction(Sub);fun1+=newDualFunction(Mul);

fun1AddMulvoidAdd{intx,inty)......voidSub{intx,inty)......voidMul{intx,inty)......委托和方法9委托加減DualFunctionfun1=newDualFunction(Add);fun1(2,3);fun1=newDualFunction(Sub);fun1+=newDualFunction(Mul);fun1(2,3);

fun1AddMulvoidAdd{intx,inty)......voidSub{intx,inty)......voidMul{intx,inty)......委托和方法10傳遞委托對象作為方法參數(shù)作為方法返回值委托和方法11Delegate類型DynamicInvokeCombine/Remove匿名方法12委托調(diào)用方法命名方法匿名方法publicstaticvoidAdd(intx,inty){Console.WriteLine("{0}+{1}={2}",x,y,x+y);}......DualFunctionfun1=newDualFunction(Add);DualFunctionfun1=delegate(intx,inty){Console.WriteLine("{0}+{1}={2}",x,y,x+y);}匿名方法13外部變量doublea=2.5,b=2;DualFunctionfun1=delegate(inta,intb){a++;b++;}fun1(a,b);DualFunctionfun2=delegate(inta,intb){a++;b--;}fun2(a,b);捕獲外部變量捕獲外部變量事件處理14委托發(fā)布和訂閱發(fā)布者delegatevoidLightEvent(boolcolor);publicclassTrafficLight{privateboolcolor;publicLightEventOnColorChange;publicvoidChangeColor(){color=!color;if(OnColorChange!=null)OnColorChange(color);}}委托類型定義委托成員定義委托激發(fā)方法事件處理15委托發(fā)布和訂閱發(fā)布者訂閱者publicclassCar{privateboolbRun;publicvoidEnter(TrafficLightlight){light.OnColorChange+=LightColorChange;}publicvoidLightColorChange(boolcolor){if(bRun&&color){bRun=false;Console.WriteLine("停車");}}}委托處理方法委托綁定事件處理委托發(fā)布和訂閱發(fā)布者(TrafficLight)觸發(fā)器(ChangeColor)委托(OnColorChange)訂閱者(Car)委托處理方法LightColorChangedelegateLightEvent事件處理17事件發(fā)布和訂閱發(fā)布者delegatevoidLightEvent(boolcolor);publicclassTrafficLight{privateboolcolor;publiceventLightEventOnColorChange;publicvoidChangeColor(){color=!color;if(OnColorChange!=null)OnColorChange(color);}}事件處理18事件發(fā)布和訂閱發(fā)布者訂閱者publicclassCar{privateboolbRun;publicvoidEnter(TrafficLightlight){light.OnColorChange+=LightColorChange;}publicvoidLightColorChange(boolcolor){if(bRun&&color){bRun=false;Console.WriteLine("停車");}}}事件處理19事件發(fā)布和訂閱發(fā)布者訂閱者publicclassBus{privateboolbRun;publicvoidEnter(TrafficLightlight){light.OnColorChange=LightColorChange;}publicvoidLightColorChange(boolcolor){...}}事件處理20使用EventHandler發(fā)布者publicclassTrafficLight{privateboolcolor;publicEventHandlerOnColorChange;publicvoidChangeColor(){color=!color;if(OnColorChange!=null)OnColorChange(this,null);}}事件處理21事件發(fā)布和訂閱發(fā)布者訂閱者publicclassCar{privateboolbRun;publicvoidEnter(TrafficLightlight){light.OnColorChange+=LightColorChange;}publicvoidLightColorChange(objectsender,EventArgse){

TrafficLightlight=(Traff