list的Contains方法是根据其元素类型定义的Equals方法来判断是否重复的。因为是实例方法,所以与继承几乎没关系。看示例:
class Program
{
static void Main(string[] args)
{
List<A> As = new List<A>()
{
new A(1,2)
};
A a1 = new A(1, 22);
Console.WriteLine(As.Contains(a1));//false
A a2 = new A(11, 2);
Console.WriteLine(As.Contains(a2));//false
//你自己对比上下区别
List<B> Bs = new List<B>()
{
new B(1,2)
};
B b1 = new B(1, 22);
Console.WriteLine(Bs.Contains(b1));//true
B b2 = new B(11, 2);
Console.WriteLine(Bs.Contains(b2));//true
Console.ReadLine();
}
}
class A
{
public int a;
public int b;
public A(int a, int b)
{
this.a = a;
this.b = b;
}
public override bool Equals(object obj)
{
if (obj == null)
return false;
if (obj.GetType() != typeof(A))
return false;
A c = obj as A;
return (this.a == c.a && this.b == c.b);
}
}
class B
{
public int a;
public int b;
public B(int a, int b)
{
this.a = a;
this.b = b;
}
public override bool Equals(object obj)
{
if (obj == null)
return false;
if (obj.GetType() != typeof(B))
return false;
B c = obj as B;
return (this.a == c.a || this.b == c.b);
}
}
追问好吧。。我再好好看看你写的,我对比一下我的。
我的就是返回true,一直也找不到原因了。