AS3 将一种类型转换为另一种类型 [英] AS3 Casting one type to another

问题描述

我有一个名为 Room 的基类和一个名为 Attic 的子类，以及另一个名为 Basement 的子类.

I have a base class called Room and a subclass called Attic, and another called Basement.

我有一个控制器类，它有一个名为 CurrentLocation 的属性，它是 Room 类型.这个想法是我希望能够将 Attic 或 Basement 放在该属性中并将其取回，然后将其转换为任何类型.

I have a controller class that has an attribute called CurrentLocation which is type Room. The idea is I want to be able to put Attic or Basement in that property and get it back, then cast that to whatever type it is.

因此，如果控制器上的内容是 Attic 类型，我正在尝试弄清楚如何显式转换它.我以为我知道，但它不起作用......这是我认为的，从 Java 借来的:

So if on the controller the content is of type Attic, I'm trying to figure out how to explicitly cast it. I thought I knew but its not working... Here's what I thought it would be, borrowing from Java:

var myAttic:Attic = (Attic) Controller.CurrentLocation;

这给了我一个语法错误:

This gives me a syntax error:

1086:语法错误:在实例之前需要分号.

1086: Syntax error: expecting semicolon before instance.

那么你如何隐式转换?或者你可以吗?我可以发誓我以前在 as3 中做过这件事.

So how do you cast implicitly? Or can you? I could swear I've done this before as as3.

推荐答案

以下是您在 ActionScript 3 中投射的选项:

Here are your options for casting in ActionScript 3:

1. 使用 as.

var myAttic:Attic = Controller.CurrentLocation as Attic; // Assignment.
(Controller.CurrentLocation as Attic).propertyOrMethod(); // In-line use.

如果转换失败，这会将 null 分配给 myAttic.

This will assign null to myAttic if the cast fails.

包裹在 Type() 中.

var myAttic:Attic = Attic(Controller.CurrentLocation); // Assignment.
Attic(Controller.CurrentLocation).propertyOrMethod(); // In-line use.

这会引发 TypeError 如果转换失败.

This throws a TypeError if the cast fails.

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