Dim、Global、Public 和 Private 作为模块化字段访问修饰符有什么区别? [英] What is the difference between Dim, Global, Public, and Private as Modular Field Access Modifiers?
问题描述
在 VB6/VBA 中,您可以在特定的 Sub
或 Function
方法之外声明模块级变量.我在模块内部之前使用过 Private
和 Public
并像这样理解它们:
In VB6/VBA, you can declare module-level variables outside of a specific Sub
or Function
method. I've used Private
and Public
before inside modules and understand them like so:
Public
- 对模块内的所有代码和模块外的所有代码可见,基本上使其成为全局的.Private
- 仅对模块内的代码可见.
Public
- visible to all code inside the module and all code outside the module, essentially making it global.Private
- visible only to code inside the module.
我注意到您可以使用 Dim
和 Global
作为模块化变量的修饰符.Dim
和 Global
在用作模块化字段的访问修饰符时分别与 Private
和 Public
不同吗?如果是,它们有何不同?
I've noticed that you can use Dim
and Global
as modifiers for modular variables. Are Dim
and Global
different from Private
and Public
, respectively, when used as access modifiers on modular fields? If so, how are they different?
推荐答案
Dim
和 Private
的工作方式相同,但共同的约定是使用 Private
在模块级别,Dim
在 Sub/Function 级别.Public
和 Global
的功能几乎相同,但是 Global
只能在标准模块中使用,而 Public
可以在所有上下文中使用(模块、类、控件、表单等)Global
来自旧版本的 VB 并可能保持向后兼容性,但已被 Public<完全取代/代码>.
Dim
and Private
work the same, though the common convention is to use Private
at the module level, and Dim
at the Sub/Function level. Public
and Global
are nearly identical in their function, however Global
can only be used in standard modules, whereas Public
can be used in all contexts (modules, classes, controls, forms etc.) Global
comes from older versions of VB and was likely kept for backwards compatibility, but has been wholly superseded by Public
.
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