任何时候,只要创建类或结构, 就会调用它的构造函数.Whenever a class or struct is created, its constructor is called.然后它变成明显如何调用它.And then it becomes obvious how to call it.如果该控件具有任何子控件,该代码将以递归方式调用它自身.The code recursively calls itself if the cont...