派生类可以隐藏访问者吗?下面的代码有什么问题

Question

我试图隐藏派生类中的访问器，这有效吗？我的系统在执行时没有响应。

class BaseCS
{
private string name;
public string Name
{
get { return name; }
set { name = "Base " + value; }
}    
}
class DerivedCS : BaseCS
{
public new string Name
{
set { Name = "Der " + value; }
get { return Name; }
}
}
public static void Main()
{
BaseCS one = new DerivedCS();
one.Name = "One";
Console.WriteLine("Name of object one is {0} ", one.Name);

((BaseCS)one).Name = "On1";
Console.WriteLine("Name of object one is {0} ", one.Name);
}

，我不应该期望输出吗

Name of object one is Base Der One
Name of object one is Base On1

Answer 1

1. 此代码：

   public new string Name
   {
   set { Name = "Der " + value; }
   get { return Name; }
   }
   

   将导致堆栈溢出，因为getter和setter中的Name将在DerivedCS中引用Name，而不是在BaseCS中。Name属性将永远调用自己，直到崩溃。您需要使用base.Name。

2. 你可能想要的是多形瘤。您应该在派生类中设置属性virtual和overridesetter。

   如果你不使用虚拟属性，以下对象将不会按照你想要的方式运行：

   BaseCS one = new DerivedCS();
   one.Name = "name"; // base implementation is called
   

3. 更改setter中的属性值通常是个坏主意。用户期望遵守以下合同：

   var a = new A();
   a.Foo = "bar";
   Debig.Assert(a.Foo == "bar");
   

Answer 2

以下是您应该做的

class BaseCS
{
private string name;
public virtual string Name
{
get { return name; }
set { name = "Base " + value; }
}
}
class DerivedCS : BaseCS
{
public override string Name
{
set { base.Name = "Der " + value; }
get { return base.Name; }
}
}

OR与新关键字

class BaseCS
{
private string name;
public string Name
{
get { return name; }
set { name = "Base " + value; }
}
}
class DerivedCS : BaseCS
{
public new  string Name
{
set { base.Name = "Der " + value; }
get { return base.Name; }
}
}
now you should create the object as the derived type to get your expected result
DerivedCS one = new DerivedCS();