我们如何继承内部类

Question

我正在尝试以下但是给我编译时错误

   class Program
{
    static void Main(string[] args)
    {
        shape.innershape s = new rectangle(); // Error Here

    }
}
class shape
{
    public int nshape = 0;
    public shape()
    {
        nshape = 1;
        innershape n = new innershape();
    }
    public void MakeOuterShape()
    {

    }
    public class innershape
    {
        public int nInnerShape = 0;
        public innershape()
        {
            nInnerShape = 1;
        }
        public void makeInnerShape()
        {

        }
    }
}
class rectangle :shape
{
     // Code goes here.
}

我继承了Shape类，其中包含innershape类的定义。但是当我尝试使用Rectangle引用innershape类的实例时，显示编译时错误。为什么？怎么能让它成为可能？

Answer 1

C＃中的内部类不像Java内部类，它们不属于外部类，只是可见性问题。

您必须从shape.innershape派生出矩形。

Answer 2

因为矩形是从形状继承的，而不是来自 innershape

  class rectangle: shape {
  ...

  public class innershape
  {
   ...

你不能写

shape.innershape s = new rectangle(); // <- can't convert rectangle to shape

但你可以改为

  shape s = new rectangle(); // shape is super class for rectangle

Perharps你应该把你的代码改成

  class rectangle :shape.innershape 
  {
  ...

Answer 3

同时尝试将您的课程公开，这样可见性不会受到限制。