c#一个字符串里有多个不同的空格怎么转化成都是一个空格

例如\"ab a bb cc\"
转化成\"ab a bb cc \"

正则替换

用记事本方式打开
在编辑菜单里
利用替换功能实现即可

using System;
using System.Text.RegularExpressions;

class MyClass
{
static void Main(string[] args)
{
string sInput, sRegex;

sInput = "aa bc de ";

sRegex = "[ ]+";

Regex r = new Regex(sRegex);

MyClass c = new MyClass();

// Assign the replace method to the MatchEvaluator delegate.
MatchEvaluator myEvaluator = new MatchEvaluator(c.ReplaceCC);

// Write out the original string.
Console.WriteLine(sInput);

// Replace matched characters using the delegate method.
sInput = r.Replace(sInput, myEvaluator);

// Write out the modified string.
Console.WriteLine(sInput);
}

public string ReplaceCC(Match m)
// Replace each Regex cc match with the number of the occurrence.
{
i++;
return " ";
}
public static int i = 0;
}

参考资料： http://msdn.microsoft.com/zh-cn/ ... matchevaluator.aspx

string str = "ab abb ccc";
while (str.IndexOf("") > 0)
{
str.Replace("", " ");
}