https://www.yiibai.com/csharp/csharp_operator_overloading.html

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在C#中，可以重新定義或重載大多數(shù)內(nèi)置運(yùn)算符。 因此，程序員也可以使用具有用戶定義類型的運(yùn)算符。重載運(yùn)算符是具有特殊名稱的功能，關(guān)鍵字operator后跟定義運(yùn)算符的符號。 類似于任何其他函數(shù)定義，重載運(yùn)算符具有返回類型和參數(shù)列表。

例如，通過以下示例函數(shù)：

public static Box operator+ (Box b, Box c) {Box box = new Box();box.length = b.length + c.length;box.breadth = b.breadth + c.breadth;box.height = b.height + c.height;return box; }

C#

上述函數(shù)為用戶自定義Box類實現(xiàn)加法運(yùn)算符(+)。它實現(xiàn)相加兩個Box對象的屬性，并返回生成的Box對象。

實現(xiàn)操作符重載

以下程序顯示了完整的實現(xiàn)：

using System; namespace OperatorOvlApplication {class Box{private double length; // Length of a boxprivate double breadth; // Breadth of a boxprivate double height; // Height of a boxpublic double getVolume(){return length * breadth * height;}public void setLength(double len){length = len;}public void setBreadth(double bre){breadth = bre;}public void setHeight(double hei){height = hei;}// Overload + operator to add two Box objects.public static Box operator +(Box b, Box c){Box box = new Box();box.length = b.length + c.length;box.breadth = b.breadth + c.breadth;box.height = b.height + c.height;return box;}}class Tester{static void Main(string[] args){Box Box1 = new Box(); // Declare Box1 of type BoxBox Box2 = new Box(); // Declare Box2 of type BoxBox Box3 = new Box(); // Declare Box3 of type Boxdouble volume = 0.0; // Store the volume of a box here// box 1 specificationBox1.setLength(60.0);Box1.setBreadth(70.0);Box1.setHeight(50.0);// box 2 specificationBox2.setLength(121.0);Box2.setBreadth(133.0);Box2.setHeight(110.0);// volume of box 1volume = Box1.getVolume();Console.WriteLine("Volume of Box1 : {0}", volume);// volume of box 2volume = Box2.getVolume();Console.WriteLine("Volume of Box2 : {0}", volume);// Add two object as follows:Box3 = Box1 + Box2;// volume of box 3volume = Box3.getVolume();Console.WriteLine("Volume of Box3 : {0}", volume);Console.ReadKey();}} }

C#

當(dāng)編譯和執(zhí)行上述代碼時，會產(chǎn)生以下結(jié)果：

Volume of Box1 : 210000 Volume of Box2 : 1770230 Volume of Box3 : 5878880

Shell

可重載和不可重載的運(yùn)算符

下表描述了 C# 中重載的運(yùn)算符：

操作符描述

+, -, !, ~, ++, --	這些一元運(yùn)算符需要一個操作數(shù)，并且可以重載。
+, -, *, /, %	這些二進(jìn)制運(yùn)算符取一個操作數(shù)并且可以重載。
==, !=, <, >, <=, >=	這些比較運(yùn)算符都可以重載
&&, //	條件邏輯運(yùn)算符不能直接重載。
+=， -=,*=，/=，％=	賦值運(yùn)算符不能被重載。
=, ., ?:, ->, new, is, sizeof, typeof	這些運(yùn)算符不能重載。

示例

根據(jù)上述討論，我們來擴(kuò)展上面的例子，并且重載更多的運(yùn)算符：

using System; namespace OperatorOvlApplication {class Box{private double length; // Length of a boxprivate double breadth; // Breadth of a boxprivate double height; // Height of a boxpublic double getVolume(){return length * breadth * height;}public void setLength( double len ){length = len;}public void setBreadth( double bre ){breadth = bre;}public void setHeight( double hei ){height = hei;}// Overload + operator to add two Box objects.public static Box operator+ (Box b, Box c){Box box = new Box();box.length = b.length + c.length;box.breadth = b.breadth + c.breadth;box.height = b.height + c.height;return box;}public static bool operator == (Box lhs, Box rhs){bool status = false;if (lhs.length == rhs.length && lhs.height == rhs.height && lhs.breadth == rhs.breadth){status = true;}return status;}public static bool operator !=(Box lhs, Box rhs){bool status = false;if (lhs.length != rhs.length || lhs.height != rhs.height || lhs.breadth != rhs.breadth){status = true;}return status;}public static bool operator <(Box lhs, Box rhs){bool status = false;if (lhs.length < rhs.length && lhs.height < rhs.height && lhs.breadth < rhs.breadth){status = true;}return status;}public static bool operator >(Box lhs, Box rhs){bool status = false;if (lhs.length > rhs.length && lhs.height > rhs.height && lhs.breadth > rhs.breadth){status = true;}return status;}public static bool operator <=(Box lhs, Box rhs){bool status = false;if (lhs.length <= rhs.length && lhs.height <= rhs.height && lhs.breadth <= rhs.breadth){status = true;}return status;}public static bool operator >=(Box lhs, Box rhs){bool status = false;if (lhs.length >= rhs.length && lhs.height >= rhs.height && lhs.breadth >= rhs.breadth){status = true;}return status;}public override string ToString(){return String.Format("({0}, {1}, {2})", length, breadth, height);}}class Tester{static void Main(string[] args){Box Box1 = new Box(); // Declare Box1 of type BoxBox Box2 = new Box(); // Declare Box2 of type BoxBox Box3 = new Box(); // Declare Box3 of type BoxBox Box4 = new Box();double volume = 0.0; // Store the volume of a box here// box 1 specificationBox1.setLength(6.0);Box1.setBreadth(7.0);Box1.setHeight(5.0);// box 2 specificationBox2.setLength(12.0);Box2.setBreadth(13.0);Box2.setHeight(10.0);//displaying the Boxes using the overloaded ToString():Console.WriteLine("Box 1: {0}", Box1.ToString());Console.WriteLine("Box 2: {0}", Box2.ToString());// volume of box 1volume = Box1.getVolume();Console.WriteLine("Volume of Box1 : {0}", volume);// volume of box 2volume = Box2.getVolume();Console.WriteLine("Volume of Box2 : {0}", volume);// Add two object as follows:Box3 = Box1 + Box2;Console.WriteLine("Box 3: {0}", Box3.ToString());// volume of box 3volume = Box3.getVolume();Console.WriteLine("Volume of Box3 : {0}", volume);//comparing the boxesif (Box1 > Box2)Console.WriteLine("Box1 is greater than Box2");elseConsole.WriteLine("Box1 is greater than Box2");if (Box1 < Box2)Console.WriteLine("Box1 is less than Box2");elseConsole.WriteLine("Box1 is not less than Box2");if (Box1 >= Box2)Console.WriteLine("Box1 is greater or equal to Box2");elseConsole.WriteLine("Box1 is not greater or equal to Box2");if (Box1 <= Box2)Console.WriteLine("Box1 is less or equal to Box2");elseConsole.WriteLine("Box1 is not less or equal to Box2");if (Box1 != Box2)Console.WriteLine("Box1 is not equal to Box2");elseConsole.WriteLine("Box1 is not greater or equal to Box2");Box4 = Box3;if (Box3 == Box4)Console.WriteLine("Box3 is equal to Box4");elseConsole.WriteLine("Box3 is not equal to Box4");Console.ReadKey();}} }

C#

當(dāng)編譯和執(zhí)行上述代碼時，會產(chǎn)生以下結(jié)果：

Box 1: (6, 7, 5) Box 2: (12, 13, 10) Volume of Box1 : 210 Volume of Box2 : 1560 Box 3: (18, 20, 15) Volume of Box3 : 5400 Box1 is not greater than Box2 Box1 is less than Box2 Box1 is not greater or equal to Box2 Box1 is less or equal to Box2 Box1 is not equal to Box2 Box3 is equal to Box4

//原文出自【易百教程】，商業(yè)轉(zhuǎn)載請聯(lián)系作者獲得授權(quán)，非商業(yè)轉(zhuǎn)載請保留原文鏈接：https://www.yiibai.com/csharp/csharp_operator_overloading.html
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