Convert String To camelCase from TitleCase C#

Question

I have a string that I converted to a TextInfo.ToTitleCase and removed the underscores and joined the string together. Now I need to change the first and only the first charact

Answer 1

Here's my code which is pretty simple. My major objective was to ensure that camel-casing was compatible with what ASP.NET serializes objects to, which the above examples don't guarantee.

public static class StringExtensions
{
    public static string ToCamelCase(this string name)
    {
        var sb = new StringBuilder();
        var i = 0;
        // While we encounter upper case characters (except for the last), convert to lowercase.
        while (i < name.Length - 1 && char.IsUpper(name[i + 1]))
        {
            sb.Append(char.ToLowerInvariant(name[i]));
            i++;
        }

        // Copy the rest of the characters as is, except if we're still on the first character - which is always lowercase.
        while (i < name.Length)
        {
            sb.Append(i == 0 ? char.ToLowerInvariant(name[i]) : name[i]);
            i++;
        }

        return sb.ToString();
    }
}

Answer 2

Here is my code, in case it is useful to anyone

    // This converts to camel case
    // Location_ID => LocationId, and testLEFTSide => TestLeftSide

    static string CamelCase(string s)
    {
        var x = s.Replace("_", "");
        if (x.Length == 0) return "Null";
        x = Regex.Replace(x, "([A-Z])([A-Z]+)($|[A-Z])",
            m => m.Groups[1].Value + m.Groups[2].Value.ToLower() + m.Groups[3].Value);
        return char.ToUpper(x[0]) + x.Substring(1);
    }

The last line changes first char to uppercase, but you can change to lowercase, or whatever you like.

Answer 3

You just need to lower the first char in the array. See this answer

Char.ToLowerInvariant(name[0]) + name.Substring(1)

As a side note, seeing as you are removing spaces you can replace the underscore with an empty string.

.Replace("_", string.Empty)

Answer 4

Example 01

    public static string ToCamelCase(this string text)
    {
        return CultureInfo.CurrentCulture.TextInfo.ToTitleCase(text);
    }

Example 02

public static string ToCamelCase(this string text)
    {
        return string.Join(" ", text
                            .Split()
                            .Select(i => char.ToUpper(i[0]) + i.Substring(1)));
    }

Example 03

    public static string ToCamelCase(this string text)
    {
        char[] a = text.ToLower().ToCharArray();

        for (int i = 0; i < a.Count(); i++)
        {
            a[i] = i == 0 || a[i - 1] == ' ' ? char.ToUpper(a[i]) : a[i];

        }
        return new string(a);
    }

Answer 5

Adapted from Leonardo's answer:

static string PascalCase(string str) {
  TextInfo cultInfo = new CultureInfo("en-US", false).TextInfo;
  str = Regex.Replace(str, "([A-Z]+)", " $1");
  str = cultInfo.ToTitleCase(str);
  str = str.Replace(" ", "");
  return str;
}

Converts to PascalCase by first adding a space before any group of capitals, and then converting to title case before removing all the spaces.