[Byte] 和 byte() 之间的区别 [重复]

Question

我正在使用 vb.net 我注意到有时会有：

Dim broadcastBytes As Byte()

和

Dim broadcastBytes As [Byte]

有区别还是只是语法？

Answer 1

是的，有区别：

Dim broadcastBytes As Byte() ➔ 将变量声明为Byte - Array：

Dim broadcastBytes As [Byte] ➔ 这里[Byte]只是数据类型Byte，但是用方括号声明，这里实际上不需要。
（见这里：What do square brackets around an identifier in VB.NET signify? ）

Answer 2

MatSnow 已经回答了您的直接问题，为了完整起见，让我再补充几个您可能会遇到的案例。

请特别注意，New Byte() 可以表示 (a) 一个新字节或 (b) 一个新字节数组，这取决于它后面是否跟 {...}。

' All examples assume Option Strict and Option Infer On (as it should be)

Dim b As Byte               ' uninitialized Byte variable

Dim b As Byte()             ' uninitialized Byte-Array (Nothing)
Dim b() As Byte             ' same as above, legacy notation

Dim b As New Byte()         ' initialized Byte variable (0), explicitly calling the default constructor
Dim b As Byte = New Byte()  ' same as above
Dim b = New Byte()          ' same as above, with type inference
Dim b As Byte = 0           ' same as above, initialized with a literal
Dim b = CByte(0)            ' same as above, with type inference

Dim b As New Byte()  {}     ' initialized Byte-Array (not Nothing, zero elements)
Dim b As New Byte()  {1, 2} ' initialized Byte-Array (two elements)
Dim b = New Byte()  {1, 2}  ' same as above, with type inference

在所有这些情况下，Byte 可以替换为 [Byte] 而无需更改任何内容。