没有“替换”(仅限Linq):

    string myString = ";,\r\t \n\n=1;;2,,3\r\r4\t\t5  6\n\n\n\n7=";
    char NoRepeat = '\n';
    string ByeBye = ";,\r\t ";
    string myResult = myString.ToCharArray().Where(t => !"STOP-OUTSIDER".Contains(t))
                 .Select(t => "" + ( ByeBye.Contains(t) ? '\n' : t))
                  .Aggregate((all, next) => (
                      next == "" + NoRepeat && all.Substring(all.Length - 1) == "" + NoRepeat
                      ? all : all  + next ) );

如果你觉得自己特别聪明，不想使用Regex:

char[] separators = new char[]{' ',';',',','\r','\t','\n'};

string s = "this;is,\ra\t\n\n\ntest";
string[] temp = s.Split(separators, StringSplitOptions.RemoveEmptyEntries);
s = String.Join("\n", temp);

您也可以用一个扩展方法来包装它。

编辑:或者只要等2分钟，我还是会把它写完:)

public static class ExtensionMethods
{
   public static string Replace(this string s, char[] separators, string newVal)
   {
       string[] temp;

       temp = s.Split(separators, StringSplitOptions.RemoveEmptyEntries);
       return String.Join( newVal, temp );
   }
}

和瞧...

char[] separators = new char[]{' ',';',',','\r','\t','\n'};
string s = "this;is,\ra\t\n\n\ntest";

s = s.Replace(separators, "\n");

哦，表演太恐怖了! 答案有点过时了，但仍然……

public static class StringUtils
{
    #region Private members

    [ThreadStatic]
    private static StringBuilder m_ReplaceSB;

    private static StringBuilder GetReplaceSB(int capacity)
    {
        var result = m_ReplaceSB;

        if (null == result)
        {
            result = new StringBuilder(capacity);
            m_ReplaceSB = result;
        }
        else
        {
            result.Clear();
            result.EnsureCapacity(capacity);
        }

        return result;
    }


    public static string ReplaceAny(this string s, char replaceWith, params char[] chars)
    {
        if (null == chars)
            return s;

        if (null == s)
            return null;

        StringBuilder sb = null;

        for (int i = 0, count = s.Length; i < count; i++)
        {
            var temp = s[i];
            var replace = false;

            for (int j = 0, cc = chars.Length; j < cc; j++)
                if (temp == chars[j])
                {
                    if (null == sb)
                    {
                        sb = GetReplaceSB(count);
                        if (i > 0)
                            sb.Append(s, 0, i);
                    }

                    replace = true;
                    break;
                }

            if (replace)
                sb.Append(replaceWith);
            else
                if (null != sb)
                    sb.Append(temp);
        }

        return null == sb ? s : sb.ToString();
    }
}

使用正则表达式。替换，像这样:

  string input = "This is   text with   far  too   much   " + 
                 "whitespace.";
  string pattern = "[;,]";
  string replacement = "\n";
  Regex rgx = new Regex(pattern);
  string result = rgx.Replace(input, replacement);

这里是关于RegEx的MSDN文档的更多信息。取代

字符串只是不可变的字符数组

你只需要让它可变:

或者使用StringBuilder 去不安全的世界玩指针(虽然很危险)

并尝试在字符数组中迭代最少的次数。注意这里的HashSet，因为它避免遍历循环中的字符序列。如果你需要更快的查找，你可以用优化的char查找(基于数组[256])替换HashSet。

StringBuilder示例

public static void MultiReplace(this StringBuilder builder, 
    char[] toReplace, 
    char replacement)
{
    HashSet<char> set = new HashSet<char>(toReplace);
    for (int i = 0; i < builder.Length; ++i)
    {
        var currentCharacter = builder[i];
        if (set.Contains(currentCharacter))
        {
            builder[i] = replacement;
        }
    }
}

编辑-优化版本(仅对ASCII有效)

public static void MultiReplace(this StringBuilder builder, 
    char[] toReplace,
    char replacement)
{
    var set = new bool[256];
    foreach (var charToReplace in toReplace)
    {
        set[charToReplace] = true;
    }
    for (int i = 0; i < builder.Length; ++i)
    {
        var currentCharacter = builder[i];
        if (set[currentCharacter])
        {
            builder[i] = replacement;
        }
    }
}

然后你就像这样使用它:

var builder = new StringBuilder("my bad,url&slugs");
builder.MultiReplace(new []{' ', '&', ','}, '-');
var result = builder.ToString();

这是最短的方法:

myString = Regex.Replace(myString, @"[;,\t\r ]|[\n]{2}", "\n");