vb.net “& _”在VB中是什么意思？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19548848/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
What does "& _" mean in VB?
提问by B. Clay Shannon
I'm copying some query statements from a legacy VB app to a C# app. I am not familiar with VB, although looking at it makes me want a VB (Victoria Bitter). I have come across queries constructed like this:
我正在将一些查询语句从旧版 VB 应用程序复制到 C# 应用程序。我不熟悉 VB，虽然看着它让我想要一个 VB（Victoria Bitter）。我遇到过这样构造的查询：
*SELECT dp_duckbill_accounts.platypus_no AS duckbill, t_accounts.name AS Name " & _
"FROM t_accounts INNER JOIN dp_duckbill_accounts ON t_accounts.account_no = dp_duckbill_accounts.account_no " & _
"ORDER BY dp_duckbill_accounts.platypus_no*
The "& _" give me pause. If it was just "&" I would think it corresponds to "+" in C# to concatenate strings. But what in the world is the point of the underscore? Note the ampersand and the underscore are separated by a space.
“& _”让我停下来。如果它只是“&”，我会认为它对应于 C# 中的“+”来连接字符串。但是下划线的重点是什么？请注意，与号和下划线之间用空格分隔。
回答by Mansfield
The underscore is the line continuation character. It allows the concatenation to include a different line. Like so:
下划线是换行符。它允许连接包含不同的行。像这样：
x = "Hello " & "World"
x = "Hello " & _
"World"
'this won't compile (pre vb.net 2010, anyway)
x = "Hello " &
"World"
回答by Daniel Imms
_means continue the statement on the following line.
_表示继续下一行的语句。
so ... & _means continue concatenating the string on the following line.
so... & _意味着继续连接下一行的字符串。
text = "One line string"
text = "Two line " & _
"string"
回答by Justin E
That is just a line continuation character that lets you continue to the next line.
这只是一个行继续符，可让您继续到下一行。
回答by Chandralal
& - is used for string concatenation in same line. example - sConcatenatedString = "First" & "Second"
& - 用于同一行中的字符串连接。 示例 - sConcatenatedString = "First" & "Second"
& _ - is used For string concatenation in different lines. example - sConcatenatedString = "First" &_ "Second"
& _ - 用于不同行中的字符串连接。 示例 - sConcatenatedString = "First" &_ "Second"
