与号与加号用于在 VB.NET 中连接字符串
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Ampersand vs plus for concatenating strings in VB.NET
提问by dcp
In VB.NET, is there any advantage to using &to concatenate strings instead of +?
在 VB.NET 中，使用&连接字符串而不是连接字符串有什么优势+吗？
For example
例如
Dim x as String = "hello" + " there"
vs.
对比
Dim x as String = "hello" & " there"
Yes, I know for a lot of string concatenations I'd want to use StringBuilder, but this is more of a general question.
是的，我知道我想使用很多字符串连接StringBuilder，但这更像是一个一般性问题。
采纳答案by Joel Coehoorn
I've heard good, strong arguments in favor of both operators. Which argument wins the day depends largely on your situation. The one thing I can say is that you should standardize on one or the other. Code that mixes the two is asking for confusion later.
我听说过支持这两个运营商的良好而有力的论据。哪种论点胜出在很大程度上取决于您的情况。我可以说的一件事是你应该标准化一个或另一个。混合这两者的代码会在以后引起混淆。
The two arguments I remember right now for favoring &:
我现在记得支持的两个论点&：
- If you're not using
Option Strictand have two numeric strings, it's easy for the compiler to confuse your meaning of of the+operator with, you know, arithmetic addition - If you're updating a lot of older vb6-era code it helps not to have to convert the concatenation operators ( and remember: we want consistency).
- 如果您没有使用
Option Strict并且有两个数字字符串，那么编译器很容易将您对+运算符的含义与算术加法混淆 - 如果您要更新许多较旧的 vb6-era 代码，则不必转换连接运算符会有所帮助（请记住：我们需要一致性）。
And for +:
而对于+：
- If you have a mixed vb/C# shop, it's nice to only have one concatenation operator. It makes it easier to move code between languages and means just that much less of a context switch for programmers when moving back and forth between languages
&is almost unique to VB, while+between strings is understood in many languages to mean concatenation, so you gain a little something in readability.
- 如果您有一个混合的 vb/C# 商店，那么最好只有一个连接运算符。它使在语言之间移动代码变得更容易，并且意味着在语言之间来回移动时程序员的上下文切换要少得多
&几乎是 VB 独有的，而+字符串之间在许多语言中被理解为表示连接，因此您在可读性方面有所收获。
回答by Walter
Microsoft's preferenceis for VB programmers to use &for strings and not +.
Microsoft 的偏好是让 VB 程序员使用&字符串而不是+.
You can also use the + operator to concatenate strings. However, to eliminate ambiguity, you should use the & operator instead.
您还可以使用 + 运算符连接字符串。但是，为了消除歧义，您应该改用 & 运算符。
回答by codingbadger
I prefer using &for string concatenations in VB.NET
我更喜欢&在 VB.NET 中用于字符串连接
One reason for this is to avoid any confusion e.g
这样做的一个原因是为了避免任何混淆，例如
MessageBox.Show(1 & 2) ' "12"
MessageBox.Show(1 + 2) ' 3
回答by Hans Olsson
It's safer to use & since you're making your intention clear to the compiler (I want to concatenate these two values and they should both be converted to strings).
使用 & 更安全，因为您向编译器表明了您的意图（我想连接这两个值，它们都应该转换为字符串）。
Using + can lead to hard to find bugs if the strings are numerical values, at least if the option strict is off.
如果字符串是数值，则使用 + 会导致难以发现错误，至少在选项 strict 关闭的情况下。
For example:
例如：
1 + "1" = 2 ' this fails if option strict is on
1 & "1" = 11
Edit: though if you're concatenating a non-string you should probably use some better method anyway.
编辑：虽然如果你连接一个非字符串，你可能应该使用一些更好的方法。
回答by PhiLho
I suppose it is historical (non .NET Visual Basic uses &, not sure why they introduced the +) and a matter of taste (I prefer & because we concatenate strings, we don't add them...).
我想这是历史性的（非 .NET Visual Basic 使用 &，不知道他们为什么引入 +）和品味问题（我更喜欢 & 因为我们连接字符串，我们不添加它们......）。
