private int IndexOfCharOrdinalIgnoreCase(char value)
{
if (!char.IsAscii(value))
{
return(CompareInfo.Invariant.IndexOf(this, value, CompareOptions.OrdinalIgnoreCase));
}
if (char.IsAsciiLetter(value))
{
char valueUc = (char)(value | 0x20);
char valueLc = (char)(value & ~0x20);
return(SpanHelpers.IndexOfAnyChar(ref _firstChar, valueLc, valueUc, Length));
}
return(SpanHelpers.IndexOfChar(ref _firstChar, value, Length));
}