September 12, 2008

ToTitleCase

Not to long ago I had to write a method to convert lowercase names to proper case for display on a website I was working on. I started rolling my own but then I thought that such a feature would be nice to have in the framework. So I hit google with a query and sure enough the framework authors had thought of it. The method was well hidden though ;)

CultureInfo.InvariantCulture.TextInfo.ToTitleCase("hELLo wORLd");
// Will return "Hello World"

This fits quite well in as an extension method

/// <summary>
/// Creates a new string with Title Case (ie "hEllO wORLd" becomes  "Hello World") using the Invariant Culture
/// </summary>
/// <param name="s">The string to convert</param>
/// <returns>The string in title case</returns>
public static string ToTitleCaseInvariant(this string s)
{
    return ToTitleCase(s, CultureInfo.InvariantCulture);
}

/// <summary>
/// Creates a new string with Title Case (ie "hEllO wORLd" becomes  "Hello World")
/// </summary>
/// <param name="s">The string to convert</param>
/// <returns>The string in title case</returns>
public static string ToTitleCase(this string s)
{
    return ToTitleCase(s, CultureInfo.CurrentCulture);
}

/// <summary>
/// Creates a new string with Title Case (ie "hEllO wORLd" becomes  "Hello World")
/// </summary>
/// <param name="s">The string to convert</param>
/// <param name="ci">The culture to use when creating title case</param>
/// <returns>The string in title case</returns>
public static string ToTitleCase(this string s, CultureInfo ci)
{
    if (s == null)
        throw new ArgumentNullException("s");

    return ci.TextInfo.ToTitleCase(s);
}

Now you can just call the ToTitleCase on your string objects like this:

var s = "george washington";
s.ToTitleCase();
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