public int IndexOf(char value,
int start,
int length)
{
if (0 > start)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.NegativeStartIndex(start));
}
if (0 > length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.NegativeLength(length));
}
if (start > _value.Length)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.StartIndexAfterValueLength(start, ToString()));
}
if (start + length >
_value.Length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.StartIndexAndLengthAfterValueLength(start, length, ToString()));
}
if (0 == _value.Length)
{
return(-1);
}
for (var i = start; i < start + length; i++)
{
if (this[i] == value)
{
return(i);
}
}
return(-1);
}
public char[] ToCharArray(int start,
int length)
{
if (0 > start)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.NegativeStartIndex(start));
}
if (0 > length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.NegativeLength(length));
}
if (start > _value.Length)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.StartIndexAfterValueLength(start, ToString()));
}
if (start + length >
_value.Length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.StartIndexAndLengthAfterValueLength(start, length, ToString()));
}
var result = new List <char>();
if (0 == length)
{
return(result.ToArray());
}
for (var i = 0; i < length; i++)
{
result.Add(_value[start + i]);
}
return(result.ToArray());
}
public int LastIndexOf(string value,
int start,
int length)
{
if (null == value)
{
throw new ArgumentNullException("value");
}
if (0 > start)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.NegativeStartIndex(start));
}
if (0 > length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.NegativeLength(length));
}
if (start > _value.Length)
{
throw new ArgumentOutOfRangeException("start", ExceptionMessage.StartIndexAfterValueLength(start, ToString()));
}
if (start + length >
_value.Length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.StartIndexAndLengthAfterValueLength(start, length, ToString()));
}
if (value.Length > length)
{
throw new ArgumentOutOfRangeException("length", ExceptionMessage.LengthShorterThanValueLength(length, value));
}
if (0 == _value.Length)
{
return(-1);
}
if (0 == value.Length)
{
return(-1);
}
if (1 == value.Length)
{
return(IndexOf(value[0]));
}
var result = -1;
var max = _value.Length - value.Length + 1;
for (var i = start; i < start + max; i++)
{
if (_value[i] !=
value[0])
{
continue;
}
for (var j = 1; j < value.Length; j++)
{
if (_value[i + j] !=
value[j])
{
break;
}
if (j != value.Length - 1)
{
continue;
}
result = i;
break;
}
}
return(result);
}
