c# - 尝试访问派生类中基类属性的 protected 访问器时出错

Question

 namespace PalleTech
 {          
     public class Parent
        {
            private int test = 123;
            public virtual int TestProperty
            {
                // Notice the accessor accessibility level.
                 set {
                    test = value;
                }

                // No access modifier is used here.
               protected get { return test; }
            }
        }
        public class Kid : Parent
        {
            private int test1 = 123;
            public override int TestProperty
            {
                // Use the same accessibility level as in the overridden accessor.
                 set { test1 = value / 123; }

                // Cannot use access modifier here.
               protected get { return 0; }
            }
        }
        public class Demo:Kid
        {
            public static void Main()
            {
                Kid k = new Kid();
                Console.Write(k.TestProperty);

            }
        }
    }

Error 1 Cannot access protected member 'PalleTech.Parent.TestProperty' via a qualifier of type 'PalleTech.Kid'; the qualifier must be of type 'PalleTech.Demo' (or derived from it)

Answer 1

From MSDN Article
“只有在通过派生类类型进行访问时，才能在派生类中访问基类的 protected 成员。”

在这里，您正在访问 Kid protected setter 及其实例。您必须创建 Demo 类的实例并通过它进行访问。