Is there a CapitalizeFirstLetter method?

Question

Is there a method to do that? Could it be done with an extension method?

I want to achieve this:

string s = "foo".CapitalizeFirstLetter();
// s is now "Foo"

Answer 1

A simple extension method, that will capitalize the first letter of a string. As Karl pointed out, this assumes that the first letter is the right one to change and is therefore not perfectly culture-safe.

public static string CapitalizeFirstLetter(this String input)
{
    if (string.IsNullOrEmpty(input)) 
        return input;

    return input.Substring(0, 1).ToUpper(CultureInfo.CurrentCulture) +
        input.Substring(1, input.Length - 1);
}

You can also use System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase. The function will convert the first character of each word to upper case. So if your input string is have fun the result will be Have Fun.

    public static string CapitalizeFirstLetter(this String input)
    {
        if (string.IsNullOrEmpty(input)) 
            return input;

        return CultureInfo.CurrentCulture.TextInfo.ToTitleCase(input);
    }

See this question for more information.

Answer 2

System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase

It has the advantage of being culture-safe.