如何在 C# 中用单个空格替换多个空格？
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How do I replace multiple spaces with a single space in C#?
提问by Pokus
How can I replace multiple spaces in a string with only one space in C#?
如何用 C# 中的一个空格替换字符串中的多个空格？
Example:
例子：
1 2 3 4 5
would be:
将是：
1 2 3 4 5
采纳答案by Patrick Desjardins
string sentence = "This is a sentence with multiple spaces";
RegexOptions options = RegexOptions.None;
Regex regex = new Regex("[ ]{2,}", options);
sentence = regex.Replace(sentence, " ");
回答by tvanfosson
string xyz = "1 2 3 4 5";
xyz = string.Join( " ", xyz.Split( new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries ));
回答by Jay Bazuzi
Consolodating other answers, per Joel, and hopefully improving slightly as I go:
根据乔尔的说法，合并其他答案，并希望随着我的进步而略有改善：
You can do this with Regex.Replace():
你可以这样做Regex.Replace()：
string s = Regex.Replace (
" 1 2 4 5",
@"[ ]{2,}",
" "
);
Or with String.Split():
static class StringExtensions
{
public static string Join(this IList<string> value, string separator)
{
return string.Join(separator, value.ToArray());
}
}
//...
string s = " 1 2 4 5".Split (
" ".ToCharArray(),
StringSplitOptions.RemoveEmptyEntries
).Join (" ");
回答by Joel Coehoorn
It's much simpler than all that:
它比所有这些都简单得多：
while(str.Contains(" ")) str = str.Replace(" ", " ");
回答by Matt
I like to use:
我喜欢使用：
myString = Regex.Replace(myString, @"\s+", " ");
Since it will catch runs of any kind of whitespace (e.g. tabs, newlines, etc.) and replace them with a single space.
因为它将捕获任何类型的空格（例如制表符、换行符等）并将它们替换为单个空格。
回答by Jay Bazuzi
I just wrote a new Jointhat I like, so I thought I'd re-answer, with it:
我刚刚写了一个Join我喜欢的新东西，所以我想我会用它重新回答：
public static string Join<T>(this IEnumerable<T> source, string separator)
{
return string.Join(separator, source.Select(e => e.ToString()).ToArray());
}
One of the cool things about this is that it work with collections that aren't strings, by calling ToString() on the elements. Usage is still the same:
关于这个很酷的事情之一是它可以通过在元素上调用 ToString() 来处理不是字符串的集合。用法还是一样的：
//...
string s = " 1 2 4 5".Split (
" ".ToCharArray(),
StringSplitOptions.RemoveEmptyEntries
).Join (" ");
回答by Jan Goyvaerts
myString = Regex.Replace(myString, " {2,}", " ");
回答by Brenda Bell
I think Matt's answer is the best, but I don't believe it's quite right. If you want to replace newlines, you must use:
我认为马特的答案是最好的，但我认为这不太正确。如果要替换换行符，必须使用：
myString = Regex.Replace(myString, @"\s+", " ", RegexOptions.Multiline);
回答by cuongle
Another approach which uses LINQ:
另一种使用 LINQ 的方法：
var list = str.Split(' ').Where(s => !string.IsNullOrWhiteSpace(s));
str = string.Join(" ", list);
回答by onedaywhen
Old skool:
老学校：
string oldText = " 1 2 3 4 5 ";
string newText = oldText
.Replace(" ", " " + (char)22 )
.Replace( (char)22 + " ", "" )
.Replace( (char)22 + "", "" );
Assert.That( newText, Is.EqualTo( " 1 2 3 4 5 " ) );
