blocks|key|1262158|text|string+cleanedString+=+System.Text.RegularExpressions.Regex.Replace(dirtyString,@"\s%2B","+");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1262159|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>string cleanedString = System.Text.RegularExpressions.Regex.Replace(dirtyString,@"\s+"," ");
</code></pre>

blocks|key|1262180|text|一个常规的表达式将是最简单的方法。如果您以正确的方式编写正则表达式，则不需要多次调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262181|将其更改为：|1262182|string+s+=+System.Text.RegularExpressions.Regex.Replace(s,+@"\s{2,}",+"+");+|code-block|syntax|javascript|1262183|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

A regular expressoin would be the easiest way. If you write the regex the correct way, you wont need multiple calls.

Change it to this:

<pre><code>string s = System.Text.RegularExpressions.Regex.Replace(s, @"\s{2,}", " "); 
</code></pre>

blocks|key|1477029|text|这是我使用的解决方案。没有RegEx和String.Split。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477030|public+static+string+TrimWhiteSpace(this+string+Value)
{
++++StringBuilder+sbOut+=+new+StringBuilder();
++++if+(!string.IsNullOrEmpty(Value))
++++{
++++++++bool+IsWhiteSpace+=+false;
++++++++for+(int+i+=+0;+i+<+Value.Length;+i%2B%2B)
++++++++{
++++++++++++if+(char.IsWhiteSpace(Value[i]))+//Comparion+with+WhiteSpace
++++++++++++{
++++++++++++++++if+(!IsWhiteSpace)+//Comparison+with+previous+Char
++++++++++++++++{
++++++++++++++++++++sbOut.Append(Value[i]);
++++++++++++++++++++IsWhiteSpace+=+true;
++++++++++++++++}
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++IsWhiteSpace+=+false;
++++++++++++++++sbOut.Append(Value[i]);
++++++++++++}
++++++++}
++++}
++++return+sbOut.ToString();
}|code-block|syntax|javascript|1477031|因此，您可以：|1477032|string+cleanedString+=+dirtyString.TrimWhiteSpace();|1477033|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is the Solution i work with. Without RegEx and String.Split.

<pre><code>public static string TrimWhiteSpace(this string Value)
{
 StringBuilder sbOut = new StringBuilder();
 if (!string.IsNullOrEmpty(Value))
 {
 bool IsWhiteSpace = false;
 for (int i = 0; i &lt; Value.Length; i++)
 {
 if (char.IsWhiteSpace(Value[i])) //Comparion with WhiteSpace
 {
 if (!IsWhiteSpace) //Comparison with previous Char
 {
 sbOut.Append(Value[i]);
 IsWhiteSpace = true;
 }
 }
 else
 {
 IsWhiteSpace = false;
 sbOut.Append(Value[i]);
 }
 }
 }
 return sbOut.ToString();
}
</code></pre>

so you can:

<pre><code>string cleanedString = dirtyString.TrimWhiteSpace();
</code></pre>

blocks|key|1476883|text|正如已经指出的，这很容易通过正则表达式来完成。我要补充的是，您可能需要添加一个.trim()来去掉前导/尾随空格。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476884|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

As already pointed out, this is easily done by a regular expression. I'll just add that you might want to add a .trim() to that to get rid of leading/trailing whitespace.

blocks|key|1262344|text|我之所以分享我使用的东西，是因为我似乎想出了一些不同的东西。我已经用了一段时间了，它对我来说已经足够快了。我不确定它和其他的比起来怎么样。我在一个带分隔符的文件写入器中使用它，并通过它运行大型数据表，一次一个字段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262345|++++public+static+string+NormalizeWhiteSpace(string+S)
++++{
++++++++string+s+=+S.Trim();
++++++++bool+iswhite+=+false;
++++++++int+iwhite;
++++++++int+sLength+=+s.Length;
++++++++StringBuilder+sb+=+new+StringBuilder(sLength);
++++++++foreach(char+c+in+s.ToCharArray())
++++++++{
++++++++++++if(Char.IsWhiteSpace(c))
++++++++++++{
++++++++++++++++if+(iswhite)
++++++++++++++++{
++++++++++++++++++++//Continuing+whitespace+ignore+it.
++++++++++++++++++++continue;
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++//New+WhiteSpace

++++++++++++++++++++//Replace+whitespace+with+a+single+space.
++++++++++++++++++++sb.Append("+");
++++++++++++++++++++//Set+iswhite+to+True+and+any+following+whitespace+will+be+ignored
++++++++++++++++++++iswhite+=+true;
++++++++++++++++}++
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++sb.Append(c.ToString());
++++++++++++++++//reset+iswhitespace+to+false
++++++++++++++++iswhite+=+false;
++++++++++++}
++++++++}
++++++++return+sb.ToString();
++++}|code-block|syntax|javascript|1262346|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I'm sharing what I use, because it appears I've come up with something different. I've been using this for a while and it is fast enough for me. I'm not sure how it stacks up against the others. I uses it in a delimited file writer and run large datatables one field at a time through it.

<pre><code> public static string NormalizeWhiteSpace(string S)
 {
 string s = S.Trim();
 bool iswhite = false;
 int iwhite;
 int sLength = s.Length;
 StringBuilder sb = new StringBuilder(sLength);
 foreach(char c in s.ToCharArray())
 {
 if(Char.IsWhiteSpace(c))
 {
 if (iswhite)
 {
 //Continuing whitespace ignore it.
 continue;
 }
 else
 {
 //New WhiteSpace

 //Replace whitespace with a single space.
 sb.Append(" ");
 //Set iswhite to True and any following whitespace will be ignored
 iswhite = true;
 } 
 }
 else
 {
 sb.Append(c.ToString());
 //reset iswhitespace to false
 iswhite = false;
 }
 }
 return sb.ToString();
 }
</code></pre>

blocks|key|1262381|text|VB.NET|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262382|Linha.Split("+").ToList().Where(Function(x)+x+<>+"+").ToArray|code-block|syntax|javascript|1262383|C#|1262384|Linha.Split("+").ToList().Where(x+=>+x+!=+"+").ToArray();|1262385|享受LINQ+=D的强大功能|1262386|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

VB.NET

<pre><code>Linha.Split(" ").ToList().Where(Function(x) x &lt;&gt; " ").ToArray
</code></pre>

C#

<pre><code>Linha.Split(" ").ToList().Where(x =&gt; x != " ").ToArray();
</code></pre>

Enjoy the power of LINQ =D

blocks|key|1262187|text|Regex+regex+=+new+Regex(@"\W%2B");
string+outputString+=+regex.Replace(inputString,+"+");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1262188|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Regex regex = new Regex(@"\W+");
string outputString = regex.Replace(inputString, " ");
</code></pre>

blocks|key|1476912|text|最小解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476913|var+regExp=/\s%2B/g,
newString=oldString.replace(regExp,'+');|code-block|syntax|javascript|1476914|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Smallest solution:
<pre><code>var regExp=/\s+/g,
newString=oldString.replace(regExp,' ');
</code></pre>

blocks|key|1477035|text|您可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477036|++++///+<summary>
++++///+Remove+all+extra+spaces+and+tabs+between+words+in+the+specified+string!
++++///+</summary>
++++///+<param+name="str">The+specified+string.</param>
++++public+static+string+RemoveExtraSpaces(string+str)
++++{
++++++++str+=+str.Trim();
++++++++StringBuilder+sb+=+new+StringBuilder();
++++++++bool+space+=+false;
++++++++foreach+(char+c+in+str)
++++++++{
++++++++++++if+(char.IsWhiteSpace(c)+%7C%7C+c+==+(char)9)+{+space+=+true;+}
++++++++++++else+{+if+(space)+{+sb.Append('+');+};+sb.Append(c);+space+=+false;+};
++++++++}
++++++++return+sb.ToString();
++++}|code-block|syntax|javascript|1477037|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try this:

<pre><code> /// &lt;summary&gt;
 /// Remove all extra spaces and tabs between words in the specified string!
 /// &lt;/summary&gt;
 /// &lt;param name="str"&gt;The specified string.&lt;/param&gt;
 public static string RemoveExtraSpaces(string str)
 {
 str = str.Trim();
 StringBuilder sb = new StringBuilder();
 bool space = false;
 foreach (char c in str)
 {
 if (char.IsWhiteSpace(c) || c == (char)9) { space = true; }
 else { if (space) { sb.Append(' '); }; sb.Append(c); space = false; };
 }
 return sb.ToString();
 }
</code></pre>

blocks|key|1262430|text|string.Join("+",+s.Split("+").Where(r+=>+r+!=+""));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1262431|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>string.Join(&quot; &quot;, s.Split(&quot; &quot;).Where(r =&gt; r != &quot;&quot;));
</code></pre>

blocks|key|1476846|text|没有内置的方法可以做到这一点。您可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476847|private+static+readonly+char[]+whitespace+=+new+char[]+{+'+',+'\n',+'\t',+'\r',+'\f',+'\v'+};
public+static+string+Normalize(string+source)
{
+++return+String.Join("+",+source.Split(whitespace,+StringSplitOptions.RemoveEmptyEntries));
}|code-block|syntax|javascript|1476848|这将删除前导空格和尾随空格，并将任何内部空格折叠为单个空格字符。如果你真的只想折叠空格，那么使用正则表达式的解决方案更好；否则这个解决方案更好。(参见Jon+Skeet完成的analysis。)|offset|length|1476849|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1279859/how-to-replace-multiple-white-spaces-with-one-white-space/1280227#1280227^0|0|0|2F|8|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

There is no way built in to do this. You can try this:

<pre><code>private static readonly char[] whitespace = new char[] { ' ', '\n', '\t', '\r', '\f', '\v' };
public static string Normalize(string source)
{
 return String.Join(" ", source.Split(whitespace, StringSplitOptions.RemoveEmptyEntries));
}
</code></pre>

This will remove leading and trailing whitespce as well as collapse any internal whitespace to a single whitespace character. If you really only want to collapse spaces, then the solutions using a regular expression are better; otherwise this solution is better. (See the <a href="https://stackoverflow.com/questions/1279859/how-to-replace-multiple-white-spaces-with-one-white-space/1280227#1280227">analysis</a> done by Jon Skeet.)

Let's say I have a string such as:

<pre><code>"Hello how are you doing?"
</code></pre>

I would like a function that turns multiple spaces into one space.

So I would get:

<pre><code>"Hello how are you doing?"
</code></pre>

I know I could use regex or call 

<pre><code>string s = "Hello how are you doing?".replace(" "," ");
</code></pre>

But I would have to call it multiple times to make sure all sequential whitespaces are replaced with only one.

Is there already a built in method for this?

How to replace multiple white spaces with one white space

假设我有一个字符串，比如："Hello     how are   you           doing?"我想要一个能把多个空格变成一个空格的函数。所以我会得到："Hello how are you doing?"我知道我可以使用regex或callstring s = "Hello     how are   you           doing?".replace("  "," ");但

问如何用一个空格替换多个空格
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