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1、Operator Overloading
Operator overloading refers to redefining C# built-in operators.
programmerIt is also possible to use operators of user-defined types. Overloaded operators are functions with special names, defined by the keyword operator followed by the operator symbol. Like other functions, overloaded operators have a return type and a parameter list.
2. Define operator overloading in the Box class

public class Box
    {
        private double length;
        [Description("长度")]
        public double Length
        {
            get { return length; }
            set { length = value; }
        }
        private double width;
        [Description("宽度")]
        public double Width
        {
            get { return width; }
            set { width = value; }
        }
        private double height;
        [Description("高度")]
        public double Height
        {
            get { return height; }
            set { height = value; }
        }

        public double GetVolume()
        {
            return length * width * height;
        }

        public static bool operator == (Box box1, Box box2)
        {
            return (box1.length == box2.length) && (box1.width == box2.width) && (box1.height == box2.height);
        }
        public static bool operator != (Box box1, Box box2)
        {
            return (box1.length != box2.length) || (box1.width != box2.width) || (box1.height != box2.height);
        }
    }
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3. Apply the Box class

Box box1 = new Box();
        Box box2 = new Box();
        Box box3 = new Box();
        double volume = 0.0;

        box1.Length = 3.0;
        box1.Width = 4.0;
        box1.Height = 5.0;
        volume=box1.GetVolume();
        Console.WriteLine($"Box1的体积是{volume}");

        box2.Length = 6.0;
        box2.Width = 7.0;
        box2.Height = 8.0;
        volume = box2.GetVolume();
        Console.WriteLine($"Box2的体积是{volume}");

        bool flag=box1 == box2;
        Console.WriteLine($"Box1==Box2:{flag}");

        flag = box1 != box2;
        Console.WriteLine($"Box1!=Box2:{flag}");
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4. Operation results