格式化字母数字字符串 [英] Formatting alphanumeric string

问题描述

我有16个字母数字字符，例如一个字符串F4194E7CC775F003。我想它格式化为F419-4E7C-C775-F003。

I have a string with 16 alphanumeric characters, e.g. F4194E7CC775F003. I'd like to format it as F419-4E7C-C775-F003.

我试图用

string.Format("{0:####-####-####-####}","F4194E7CC775F003");

但是，这并不工作，因为它不是一个数值。

but this doesn't work since it's not a numeric value.

于是我想出了以下内容：

So I came up with the following:

public class DashFormatter : IFormatProvider, ICustomFormatter
{
  public object GetFormat(Type formatType)
  {
    return this;
  }

  public string Format(string format, object arg, IFormatProvider formatProvider)
  {
    char[] chars = arg.ToString().ToCharArray();
    StringBuilder sb = new StringBuilder();

    for (int i = 0; i < chars.Length; i++)
    {
      if (i > 0 && i % 4 == 0)
      {
        sb.Append('-');
      }

      sb.Append(chars[i]);
    }

    return sb.ToString();
  }
}

和使用

string.Format(new DashFormatter(), "{0}", "F4194E7CC775F003");

我是能够解决的问题，但是我希望有一个更好/更简单的方法它？也许有些LINQ的魔力？

I was able to solve the problem, however I was hoping there is a better/simpler way to do it? Perhaps some LINQ magic?

感谢。

推荐答案

您可以做它没有Linq的一行：

You can do it in one line without Linq:

        StringBuilder  splitMe = new StringBuilder("F4194E7CC775F003");
        string joined = splitMe.Insert(12, "-").Insert(8, "-").Insert(4, "-").ToString();

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