VB.Net 关于类型关键字加方括号进行转义（Dim As [String]）的总结

看到帖子《Dim s1 As [String]和Dim s1 As String之间什么区别》的提问，专门做了测试，总结如下。

一、本来用方括号转义名称是为了类似下面这样的用法：

1)把关键字作为类型。

2)把关键字作为变量。

Module Module1

Private Enum [String]
ASCII
Unicode
End Enum

Dim s As [String] = [String].Unicode

Dim [As] As Integer = 0

End Module

二、当 As 后面出现类型关键字加方括号的转义，并且这个转义类型没有在前面定义过时：

A)标准的 CLR 类型会自动解释为原始的类型（当作方括号不存在）。

B)而 VB.Net 的特有类型会报错。

根据《数据类型摘要 (Visual Basic)》，把基本类型都转义了一下，测试代码如下：

Module Module2

Dim a As [Char]
Dim b1 As [DateTime], b2 As [Date]
Dim c As [Decimal]
Dim d As [Double]
Dim e1 As [Int32], e2 As [Integer]
Dim f1 As [Int64], f2 As [Long]
Dim g As [Object]
Dim h As [SByte]
Dim g1 As [Int16], g2 As [Short]
Dim i As [Single]
Dim j As [String]
Dim k1 As [UInt32], k2 As [UInteger]
Dim l1 As [UInt64], l2 As [ULong]
Dim m1 As [UInt16], m2 As [UShort]

End Module

在 Visual Studio .Net （截图）中可以看到编译错误