/// <summary>
/// Copies part of lines of the current <see cref="TextReader"/> object to a <see cref="TextWriter"/> object.
/// </summary>
/// <param name="readers">The current <see cref="TextReader"/> object.</param>
/// <param name="output">The output <see cref="TextWriter"/> object.</param>
/// <param name="offset">Provides the current-postion based index of the line where the copy starts. If this argument is set 0, the copy starts from the current position of the <see cref="TextReader"/> object.</param>
/// <param name="lineCount">The number of lines to copy.</param>
/// <exception cref="System.ArgumentNullException">
/// Occurs when either <paramref name="reader"/> or <paramref name="output"/> is <c>null</c>.
/// </exception>
public static void CopySublines(this TextReader reader, TextWriter output, int offset, int lineCount)
{
if (lineCount <= 0)
{
return;
}
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if (output == null)
{
throw new ArgumentNullException("output");
}
reader.Advance(offset);
while (lineCount != 0)
{
output.WriteLine(reader.ReadLine());
--lineCount;
}
}
