using System;
public class Parent
{
string parentString;
public Parent()
{
Console.WriteLine("Parent Constructor.");
}
public Parent(string myString)
{
parentString = myString;
Console.WriteLine(parentString);
}
public void print()
{
Console.WriteLine("I'm a Parent Class.");
}
}

public class Child : Parent
{
public Child() : base("From Derived")
{
Console.WriteLine("Child Constructor.");
}
public void print()
{
base.print();
Console.WriteLine("I'm a Child Class.");
}

public static void Main()
{
Child child = new Child();
child.print();
((Parent)child).print();
}
}

为什么编译时出现了这样的警告：child.print()上要求关键字new