c# - 将表单列表存储在数组中

Question

我有一个程序需要按给定顺序浏览一系列屏幕。我想做的是集中管理它，使用类似于类工厂的东西，我在其中发送对下一个表单的请求，它实例化并返回下一个表单。然而，我有以下内容，这将立即实例化所有表单:

private List<Form> screens = new List<Form>() { new Form1(), new Form2(), … };
private Form currentForm;
private int currentPos;

public Form Next()
{            
    currentForm = screens[++currentPos];
    return currentForm;
}

有没有办法将实例化推迟到实际请求发出时？例如:

private List<Form> screens = new List<Form>() { Form1,Form2, …};
private Form currentFrm;
private int currentPos;

public Form Next()
{            
    currentForm = new screens[++currentPos];
    return currentFrm;
}

(这不会编译)

Answer 1

一种方法是将类型存储在列表中并使用 Activator.CreateInstance()动态创建表单实例:

private Type[] screenTypes = new Type[] {
    typeof(Form1),
    typeof(Form2),
    ...
};

private Form currentForm;
private int currentPos;

public Form Next()
{            
    currentForm = (Form) Activator.CreateInstance(screenTypes[++currentPos]);
    return currentForm;
}