| public abstract Seek ( long offset, SeekOrigin origin ) : long | ||
| offset | long | |
| origin | SeekOrigin | |
| return | long | |
// Read data of specified length from specified offset into a buffer
public long Read(long offset, char[] buffer, int offsetInBuffer, int count)
{
if (IsNull)
{
throw new SqlNullValueException();
}
// Validate the arguments
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset > this.Length || offset < 0)
{
throw new ArgumentOutOfRangeException("offset");
}
if (offsetInBuffer > buffer.Length || offsetInBuffer < 0)
{
throw new ArgumentOutOfRangeException("offsetInBuffer");
}
if (count < 0 || count > buffer.Length - offsetInBuffer)
{
throw new ArgumentOutOfRangeException("count");
}
// Adjust count based on data length
if (count > this.Length - offset)
{
count = (int)(this.Length - offset);
}
if (count != 0)
{
switch (_state)
{
case SqlBytesCharsState.Stream:
if (m_stream.Position != offset)
{
m_stream.Seek(offset, SeekOrigin.Begin);
}
m_stream.Read(buffer, offsetInBuffer, count);
break;
default:
// ProjectK\Core doesn't support long-typed array indexers
Debug.Assert(offset < int.MaxValue);
Array.Copy(m_rgchBuf, checked ((int)offset), buffer, offsetInBuffer, count);
break;
}
}
return(count);
}
// Read data of specified length from specified offset into a buffer
public long Read(long offset, char[] buffer, int offsetInBuffer, int count)
{
if (IsNull)
{
throw new SqlNullValueException();
}
// Validate the arguments
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset > Length || offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (offsetInBuffer > buffer.Length || offsetInBuffer < 0)
{
throw new ArgumentOutOfRangeException(nameof(offsetInBuffer));
}
if (count < 0 || count > buffer.Length - offsetInBuffer)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
// Adjust count based on data length
if (count > Length - offset)
{
count = (int)(Length - offset);
}
if (count != 0)
{
switch (_state)
{
case SqlBytesCharsState.Stream:
if (_stream.Position != offset)
{
_stream.Seek(offset, SeekOrigin.Begin);
}
_stream.Read(buffer, offsetInBuffer, count);
break;
default:
Array.Copy(_rgchBuf, offset, buffer, offsetInBuffer, count);
break;
}
}
return(count);
}