static void Main(string[] args)
{
bool result;
/*************引用类型判等****************/
/*对于引用类型，即使类型的实例（对象）包含的值相等，如果变量指向的是不同的对象，那么也不相等。*/
RefPoint rPoint1 = new RefPoint(1);
RefPoint rPoint2 = rPoint1;
result = (rPoint1 == rPoint2); // 返回 true;
Console.WriteLine("rPoint1 == rPoint2 => " + result);
result = rPoint1.Equals(rPoint2); // #2 返回 true;
Console.WriteLine("rPoint1.Equals(rPoint2) => " + result);
// 创建新引用类型的对象，其成员的值相等
RefPoint rPoint4 = new RefPoint(1);
RefPoint rPoint3 = new RefPoint(1);
result = (rPoint3 == rPoint4);
Console.WriteLine("rPoint3 == rPoint4 =>" + result); // 返回 false;
result = rPoint3.Equals(rPoint4);
Console.WriteLine("rPoint3.Equals(rPoint4) =>" + result); // #2 返回 false
/*************值类型判等****************/
// 复制结构变量
ValPoint vPoint1 = new ValPoint(1);
ValPoint vPoint2 = vPoint1;
//result = (vPoint1 == vPoint2); // 编译错误：不能在 ValPoint 上应用 "==" 操作符
//Console.WriteLine(result);
//ReferenceEquals判断两个对象是否在一个内存地址上。
result = Object.ReferenceEquals(vPoint1, vPoint2); // 隐式装箱，指向了堆上的不同对象
Console.WriteLine("ReferenceEquals(vPoint1, vPoint2) =>" + result); // 返回 false
//值类型Equals会先判断两个类型是否是同一类型，再逐个判断两个值类型变量对应项的值是否相关。
result = vPoint1.Equals(vPoint2);
Console.WriteLine("vPoint1.Equals(vPoint2) =>" + result);
vPoint2.x = 2;
result = vPoint1.Equals(vPoint2); // #5 返回 true; #6 返回 false;
Console.WriteLine("vPoint1.Equals(vPoint2) =>" + result);
RefPoint rPoint = new RefPoint(1);
ValPoint vPoint = new ValPoint(1);
ValLine line1 = new ValLine(rPoint, vPoint);
ValLine line2 = line1;
result = line1.Equals(line2); // 此时已经存在一个装箱操作，调用 ValueType.Equals()
Console.WriteLine(result); // 返回 True
Console.ReadKey();
}
public ValPoint vPoint; // 值类型成员
public ValLine(RefPoint rPoint, ValPoint vPoint)
{
this.rPoint = rPoint;
this.vPoint = vPoint;
}