使用RecyclerView显示数据库中的数据：
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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