.NET method to convert a string to sentence case

Question

I\'m looking for a function to convert a string of text that is in UpperCase to SentenceCase. All the examples I can find turn the text into TitleCase.

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Answer 1

I found this sample on MSDN.

Answer 2

This works for me.

/// <summary>
/// Converts a string to sentence case.
/// </summary>
/// <param name="input">The string to convert.</param>
/// <returns>A string</returns>
public static string SentenceCase(string input)
{
    if (input.Length < 1)
        return input;

    string sentence = input.ToLower();
    return sentence[0].ToString().ToUpper() +
       sentence.Substring(1);
}

Answer 3

If you'd like to sentence case a string containing punctuation other than just periods:

string input = "THIS IS YELLING! WHY ARE WE YELLING? BECAUSE WE CAN. THAT IS ALL.";
var sentenceRegex = new Regex(@"(^[a-z])|[?!.:,;]\s+(.)", RegexOptions.ExplicitCapture);
input = sentenceRegex.Replace(input.ToLower(), s => s.Value.ToUpper());