VB.NET中的隐式转换 [英] Implicit casting in VB.NET

问题描述

该问题适用于懒惰的VB程序员.拜托.

The question is intended for lazy VB programmers. Please.

在vb中我可以做到，而且不会出现任何错误.

In vb I can do and I won't get any errors.

示例1

Dim x As String = 5
Dim y As Integer = "5"
Dim b As Boolean = "True"

示例2

Dim a As EnumType = 4
Dim v As Integer = EnumType.EnumValue

示例3

Private Sub ButtonClick(sender As Object, e As EventArgs)
    Dim btn As Button = sender        
End Sub

示例4

Private Sub ButtonClick(sender As Button, e As EventArgs)
    Dim data As Contact = sender.Tag
End Sub

如果我确实知道预期的运行时类型，是否禁止"依赖vb语言内置的强制转换? 我什么时候可以依靠?

If I surely know the expected runtime type, is this 'forbidden' to rely on the vb-language built-in casting? When can I rely?

推荐答案

对MarkJ的评论已针对每个OP进行了回答

随意依赖于您想要的所有内容，只需确保您知道隐式强制转换所执行操作的规则即可.就是说，示例#4在将来看起来真的很容易破解，如果以前至少进行过一次空检查，我会更加高兴.

Feel free to rely on it all you want, just make sure you know the rules for what the implicit cast is doing. That said, example #4 looks really easy to break in the future, I'd be much happier if there was at least a null-check before.

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