检查空字符串 [英] checking for empty string
问题描述
你使用哪一个？为什么？
MyString == null || MyString ==""
vs
MyString == null || MyString.Length == 0
which one do you use and why?
MyString == null || MyString == ""
vs
MyString == null || MyString.Length == 0
推荐答案
检查长度比检查字符串是否为空更好:)
再见。
-------------------
LEBRUN Thomas
http://morpheus.developpez.com
http://blog.developpez.com/index.php?blog=9
Dan Bass写道：
Checking the length is better than checking if the string is empty or not :)
Bye.
-------------------
LEBRUN Thomas
http://morpheus.developpez.com
http://blog.developpez.com/index.php?blog=9
"Dan Bass" wrote:
你使用哪一个？为什么？
MyString == null || MyString ==""
vs
MyString == null || MyString.Length == 0
which one do you use and why?
MyString == null || MyString == ""
vs
MyString == null || MyString.Length == 0
我通常使用：
MyString == null || MyString.Length == 0
与Lutz Roeder的.Net Reflector相比，看来这个
版本相当于MyString == null || MyString.m_stringLength == 0
而另一个版本如果相当于
MyString == null ||
CultureInfo.CurrentCulture.CompareInfo.Compare（MyS tring，new String（""），
CompareOptions.None）== 0
-
真相，
James Curran
[以前的VC ++ MVP]
主页： www.noveltheory.com 工作： www.njtheater.com
博客： www.honestillusion.com 日间工作： www.partsearch.com
Dan Bass < danielbass [at] postmaster [dot] co [dot] uk>在消息中写道
新闻：％2 **************** @ TK2MSFTNGP10.phx.gbl ...您使用哪一个？为什么？
MyString == null || MyString ==""
vs
MyString == null || MyString.Length == 0
MyString == null || MyString.Length == 0
Poking around a bit with Lutz Roeder''s .Net Reflector, it seems that this
version is the equivalent of MyString == null || MyString.m_stringLength == 0
while the other version if the equivalent of
MyString == null || CultureInfo.CurrentCulture.CompareInfo.Compare(MyS tring, new String (""),
CompareOptions.None) == 0
--
Truth,
James Curran
[erstwhile VC++ MVP]
Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com
"Dan Bass" <danielbass [at] postmaster [dot] co [dot] uk> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl... which one do you use and why?
MyString == null || MyString == ""
vs
MyString == null || MyString.Length == 0
<" Dan Bass" < danielbass [at] postmaster [dot] co [dot] uk>>写道：
<"Dan Bass" <danielbass [at] postmaster [dot] co [dot] uk>> wrote:
你使用哪一个？为什么？
MyString == null || MyString ==""
vs
MyString == null || MyString.Length == 0
which one do you use and why?
MyString == null || MyString == ""
vs
MyString == null || MyString.Length == 0
嗯，后者效率稍高，所以你应该使用它，如果
这是一个瓶颈你的应用程序，但实际上它是
的情况，在大多数情况下你认为最具可读性。我个人比较喜欢
，但这真的是一个品味问题。
-
Jon Skeet - < sk *** @ pobox.com>
http：// www。 pobox.com/~skeet
如果回复小组，请不要给我发邮件
Well, the latter is slightly more efficient, so you should use that if
this is a bottleneck in your application, but really it''s a case of
whichever you find most readable, in most cases. I personally prefer
the first, but it''s really a matter of taste.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
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