C#/VB如何定义抽象属性

抽象属性声明不提供属性访问器的实现，它只声明该类支持属性，而将访问器实现留给派生类。
下面的示例演示如何实现从基类继承的抽象属性。

C#

public abstract class Base
{

    // name is a abstract property 
    public abstract string Name
    {
        get;
        set;
    }  
  
}

public class Child: Base
{
    private string m_Name;
    
    //override abstract property
    public override double Name
    {
        get
        {           
            return m_Name;
        }
        set
        {
           m_Name = value; 
         }
    }
}

VB.Net

Public MustInherit Class Base

    // name is a abstract property 
    Public MustOverride Name() As String   
   
End Class

Public class Child
      Inherits  Base

    Private m_Name As String    
    //override abstract property
    public Overrides Property Name() As String    
        Get                   
            Return m_Name;
        End Get
        Set        
           m_Name = value; 
        End Set
    End Property 

End Class

声明抽象属性时（如本示例中的 Name），指明哪些属性访问器可用即可，不要实现它们。
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