private static bool SimpleDelegateTest()
{
CharFilterDelegate filterDelegate = CharFilterUpperCase;
char lower = 'x';
char upper = filterDelegate(lower);
Console.WriteLine($@"lower = '{lower}', upper = '{upper}'");
return(upper == Char.ToUpper(lower));
}
private static string TransformStringUsingCharFilter(string inputString, CharFilterDelegate charFilter)
{
StringBuilder outputBuilder = new StringBuilder(inputString.Length);
foreach (char c in inputString)
{
char filteredChar = charFilter(c);
if (filteredChar != '\0')
{
outputBuilder.Append(filteredChar);
}
}
return(outputBuilder.ToString());
}