Question

尽管有各种解释，我仍然想要了解一些事情。内部和受保护之间的唯一区别是在项目中使用它吗？

谢谢，

塔尔

Answer 1

AFAIK没有受保护或内部项目。项目包含类和其他类型，并且是项目中可以具有不同访问修饰符的那些元素。

内部修饰符：只能在同一个程序集中引用/加入（相同的.exe或.dll）

受保护的修饰符：可以从继承自他的类中引用/接受，继承它的类可能位于另一个程序集中（例如，公共类中的受保护方法，只能从另一个继承的类中调用）从它，但该类可能在另一个程序集/项目中，因为该类被声明为公共）。

还有其他辅助功能修饰符，其中一个我刚才提到过：

公共修饰符：可以从同一个程序集或其他程序集中的类中引用/加入。

私有修饰符：可以从已声明的同一个类中引用/加入。

实施例

Assembly/Project1

public class ClassA {
    private string variable1;
    protected string variable2;
    public string variable3;
    internal string variable4;

    public void MyFancyProcess()
    {
        Console.Write(variable1);
    }
}

public class ClassB : ClassA {
    public string variable5;

    private void DoSomeStuff()
    {
        Console.Write(variable1); // This would raise an error, its is private and only could be called from ClassA *even if ClassB is child of ClassA*
        Console.Write(variable2); // I can access variable2 because it is protected *AND ClassB is child of ClassA*
        Console.Write(variable3); // This would work, public has no restrictions
        Console.Write(variable4); // This would work, ClassB and ClassA share same assembly
    }
}

internal class ClassC
{
    ClassA myAClassInstance = new ClassA();

    Console.Write(myAClassInstance.variable1); // This would raise an error, it is exclusive to ClassA and we are in ClassC
    Console.Write(myAClassInstance.variable2); // This would raise an error, because ClassC does not inherit ClassA
    Console.Write(myAClassInstance.variable3);
    Console.Write(myAClassInstance.variable4); // This would work, ClassC and ClassA share same assembly
}
Assembly/ProjectB

public class ClassD : ClassA // Please note that if ClassA where not public it would raise an error
{
    public void ExecuteMyLogic()
    {
       Console.Write(variable1); // This would raise an error, its is private and only could be called from ClassA
        Console.Write(variable2); // I can access variable2 because it is protected *AND ClassD is child of ClassA despite being a different assembly*
        Console.Write(variable3); // This would work, public has no restrictions
        Console.Write(variable4); // This would raise an error, they are different assemblies
    }
}

受保护的VS内部有什么不同？

1 个答案: