C＃中的字符串字符替换 [英] c# string character replace

问题描述

我有一个字符串，其中倒数第三的性格有时是，如果这是我想用来替换它的情况。的字符串也可能有其他的，的各处。是否有一个优雅的解决方案呢？

I have a string where the third last character is sometimes a , If this is the case I want to replace it with a . The string could also have other ,'s throughout. Is there an elegant solution to this?

编辑：谢谢大家对你的答案。只是为了澄清，是由倒数第三我指的是格式的字符串 XXXXXX，XX （这是一个欧洲货币东西）

Thanks everyone for your answers. Just to clarify, yes by third last I mean a string of the form xxxxxx,xx (it's a european currency thing)

推荐答案

如何：

if (text[text.Length - 3] == ',')
{
    StringBuilder builder = new StringBuilder(text);
    builder[text.Length - 3] = '.';
    text = builder.ToString();
}

编辑：我的希望的上面是差不多最有效的方法。你可以尝试使用一个字符数组来代替：

I hope the above is just about the most efficient approach. You could try using a char array instead:

if (text[text.Length - 3] == ',')
{
    char[] chars = text.ToCharArray();
    chars[text.Length - 3] = '.';
    text = new string(chars);
}

使用子串将工作为好，但我不认为这是任何更具可读性：

Using Substring will work as well, but I don't think it's any more readable:

if (text[text.Length - 3] == ',')
{
    text = text.Substring(0, text.Length - 3) + "."
           + text.Substring(text.Length - 2);
}

编辑：我一直假设在这种情况下，你已经知道文将至少三个字符长度。如果不是这种情况，你显然希望为该以及测试。

I've been assuming that in this situation you already know that text will be at least three characters length. If that's not the case, you'd obviously want a test for that as well.

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