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 As = new List()
{
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 Bs = new List()
{
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);
}
}
你的类和List如何定义的？
我测试是返回false，定义如下：
public class C { }
public class A:C { }
public class B:C { }
private void button1_Click(object sender,EventArgs e)
{
A a=new A();
B b=new B();
C c=new C();
List
lst.Add(a);
if(lst.Contains(b))
MessageBox.Show("true!");
else
MessageBox.Show("false!");
}
结果：
false!
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