在 vb.net 中声明为 new 和 as something = new something 有什么区别? [英] what's the difference between declaring as new and as something = new something in vb.net?

问题描述

我见过这样的代码

Dim s as something = new something
Dim s as new something

有什么区别?有吗?

推荐答案

略有不同.

第一个允许你做:

Dim s as ParentType = new InheritedType

第二个没有.

这样做的优点"是 s 可以是与 ParentType 相关的许多不同类型，而不会在运行时爆炸.

The "advantage" of this is s can be a number of different types related to ParentType without it exploding at runtime.

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