Question

函数调用缺少参数列表；请使用&……

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Answer 1

Form formPreview = new Form(); public Leaf(string name) : base(name) { } public override void Add(Component c) { Console.WriteLine("Cannot add to a leaf"); } public override void Remove(Component c) { Console.WriteLine("Cannot remove to a leaf"); } public override void Display(int depth) { Console.WriteLine(new string('-',depth)+name); }

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