/// <summary>
/// Returns a string that consists of the rightmost n characters of the source string
/// </summary>
/// <param name="source"></param>
/// <param name="length"></param>
/// <returns></returns>
public static string Right(this string source, int length, OutOfRangeAction outOfRangeAction = OutOfRangeAction.returnNull)
{
if (length > source.Length || length < 0)
{
return(source.HandleOutOfRangeAction(outOfRangeAction));
}
return(source.Substring(source.Length - length));
}
private static string HandleOutOfRangeAction(this string source, OutOfRangeAction outOfRangeAction)
{
switch (outOfRangeAction)
{
case OutOfRangeAction.returnNull: return(null);
case OutOfRangeAction.returnEmpty: return(String.Empty);
case OutOfRangeAction.throwException: throw new IndexOutOfRangeException("index is not in range");
default: throw new NotImplementedException($"{outOfRangeAction} is not handled");
}
}
