錯誤：不能宣佈一個虛擬/抽象成員私人

Question

Possible Duplicate:
Why are private virtual methods illegal in C#?

我在C＃下面的代碼，和Visual Studio在派生類中抱怨說，我不能宣佈一個虛擬/抽象成員私人..但我不是......所以有人有一些想法？感謝

public class Base 
{ 
    private const string Name= "Name1"; 
    protected virtual string Member1 
    { 
    get{ 
     return Name; 
     } 
    } 
} 

public class Derived: Base 
{ 
private const string Name= "Name2"; 
protected override string Member1 
{ 
    get{ 
    return Name; 
    } 
} 
} 

Answer 1

無法複製，具有固定「類」的情況下和提供的方法機構：

class Base 
{  
    protected virtual string Member1() { return null; }  
} 

class Derived : Base 
{ 
    protected override string Member1() { return null; } 
} 

這將編譯沒有警告。

如果你試圖聲明領域虛擬，你會得到：

Test.cs(11,30): error CS0106: The modifier 'virtual' is not valid for this item
Test.cs(17,31): error CS0106: The modifier 'override' is not valid for this item

Answer 2

虛方法必須有一個身體：

public class Base 
{ 

    protected virtual string Member1() 
    { 
     return ""; 
    } 

} 

public class Derived: Base 
{ 
    protected override string Member1() 
    { 
     return "this is the ovveride"; 
    } 

}