先说一下函数Equals和运算符"=="二者的区别：
1. 对比值类型：
”==“ 与 ”Equals“ 一样，都是对比变量值
C#已经重写了string的”==“和”Equals“，对比结果与值类型一致
2. 对比引用类型：
引用类型：内容存储在堆，堆地址存储在栈
”==“ 对比引用地址，即栈内存储的堆地址
”Equals“ 对比对象，即堆上存储的对象内容
举一个栗子来说明重写，需要的可以按此方式扩展啦~
一条2D线段，用起点终点来表示，判断线段相等需要判断起点终点都相等，这个比较简单，就不上代码啰嗦啦。重点是通过重写Equals函数，更方便的实现判断。
//定义线段类
class OverrideLine
{
public Vector2 A { get; private set; }
public Vector2 B { get; private set; }
public OverrideLine(Vector2 pointA, Vector2 pointB)
{
A = pointA;
B = pointB;
}
public override bool Equals(object obj)
{
if (obj is OverrideLine)
{
var edge = (OverrideLine)obj;
return (edge.A == A && edge.B == B) || (edge.B == A && edge.A == B);
}
return false;
}
public override int GetHashCode()
{
return A.GetHashCode() ^ B.GetHashCode();
}
public static bool operator ==(OverrideLine line01, OverrideLine line02)
{
return line01.Equals(line02);
}
public static bool operator !=(OverrideLine line01, OverrideLine line02)
{
return !(line01 == line02);
}
public override string ToString()
{
return string.Format("[" + A + "->" + B + "]");
}
}
//在定义一个普通的类，以作对比
class NormalLine
{
public Vector2 A { get; private set; }
public Vector2 B { get; private set; }
public NormalLine(Vector2 pointA, Vector2 pointB)
{
A = pointA;
B = pointB;
}
}
//接下来打印一下对比结果
public class OverrideEquals : MonoBehaviour
{
void Start()
{
OverrideLine line01 = new OverrideLine(Vector2.zero, Vector2.one);
OverrideLine line02 = new OverrideLine(Vector2.zero, Vector2.one);
List<OverrideLine> overrideLineList = new List<OverrideLine>();
overrideLineList.Add(line01);
Debug.Log(line01.Equals(line02));
Debug.Log(line01 == line02);
Debug.Log(overrideLineList.Contains(line02));
NormalLine line03 = new NormalLine(Vector2.zero, Vector2.one);
NormalLine line04 = new NormalLine(Vector2.zero, Vector2.one);
List<NormalLine> normalLineList = new List<NormalLine>();
normalLineList.Add(line03);
Debug.Log(line03.Equals(line04));
Debug.Log(line03 == line04);
Debug.Log(normalLineList.Contains(line04));
}
}
