/// <summary>Gets the digit value of the numeric character at the specified index of the specified string.</summary>
/// <returns>The digit value of the numeric character at the specified index of the specified string.-or- -1, if the character at the specified index of the specified string is not a digit.</returns>
/// <param name="s">The <see cref="T:System.String" /> containing the Unicode character for which to get the digit value. </param>
/// <param name="index">The index of the Unicode character for which to get the digit value. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="s" /> is null. </exception>
/// <exception cref="T:System.ArgumentOutOfRangeException">
/// <paramref name="index" /> is outside the range of valid indexes in <paramref name="s" />. </exception>
public static int GetDigitValue(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException("s");
}
return(CharUnicodeInfo.GetDigitValue(s[index]));
}