.NET与string.replace [英] .NET String.Replace

问题描述

我很恼火。通常情况下，我喜欢替代作用，因为它在C＃中，但有一个C ++风格取代它只替换一个字母的时间或我指定x量？

I am so annoyed. Typically I like replace acting as it does in C# but is there a C++ styled replace where it only replaces one letter at a time or the X amount I specify?

推荐答案

没有没有一个在BCL替换法将取代该字符只有一个实例。两个主要的替代方法将取代所有出现。然而，这并不难写，做一个字符替换版本。

No there is not a Replace method in the BCL which will replace only a single instance of the character. The two main Replace methods will replace all occurances. However, it's not terribly difficult to write a version that does a single character replacement.

public static string ReplaceSingle(this string source, char toReplace, char newChar) {
  var index = source.IndexOf(toReplace);
  if ( index < 0 ) {
    return source;
  }
  var builder = new StringBuilder();
  for( var i = 0; i < source.Length; i++ ) {
    if ( i == index ) {
      builder.Append(newChar);
    } else {
      builder.Append(source[i]);
    }
  }
  return builder.ToString();
}

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