布尔值和[布尔值]有什么区别？

发布于 2024-08-24 04:06:36 字数 198 浏览 8 评论 0原文

我通过 C# 到 VB 的自动翻译器运行了一些代码，它翻译了一些如下代码：

Public Property Title As [String]

这与两者有何不同

Public Property Title As String

？为什么两者都存在？

原文

I ran some code through an automatic translator for C# to VB, and it translated some code like this:

Public Property Title As [String]

How is this different to

Public Property Title As String

and why do both exist?

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陌伤ぢ 2024-08-31 04:06:36

String 是一个关键字。如果您想使用关键字作为标识符，则必须将其括在方括号中。 [String] 是一个标识符。 String 关键字始终引用 System.String 类，而 [String] 可以引用您自己的名为 String 的类当前的命名空间。假设您有导入系统，大多数时候两者都指相同的事物，但它们可以不同：

Module Test
    Class [String]
    End Class
    Sub Main()
        Dim s As String = "Hello World"        // works
        Dim s2 As [String] = "Hello World"     // doesn't work
    End Sub
End Module

[] 将关键字视为标识符是为了与其他语言的库（可能使用 VB 关键字作为类型或成员名称）进行互操作。

String is a keyword. If you want to use a keyword as an identifier, you'll have to enclose it in brackets. [String] is an identifier. String keyword always refers to System.String class while [String] can refer to your own class named String in the current namespace. Assuming you have Imports System, both refer to the same thing most of the time but they can be different:

Module Test
    Class [String]
    End Class
    Sub Main()
        Dim s As String = "Hello World"        // works
        Dim s2 As [String] = "Hello World"     // doesn't work
    End Sub
End Module

The primary reason for existence of [ ] for treating keywords as identifiers is interoperability with libraries from other languages that may use VB keywords as type or member names.

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