Shadi

I tracked it down in the Netduino source code:

StreamReader.Peek()

m_curBufPos is 511

m_curBufLen is 512

m_buffer is byte[512]

[color=#0000FF;]   if[/color] (m_curBufPos == m_curBufLen || (([color=#ff0000;]m_buffer[m_curBufPos + 1][/color] & 0x80) != 0 && m_curBufPos + 3 > m_curBufLen))

As you know, in a 512 length array, there is no position 512.

So if we change the code to:

  [color=#0000FF;]if[/color] (m_curBufPos <= (m_curBufLen - 1) || ((m_buffer[m_curBufPos + 1] & 0x80) != 0 && m_curBufPos + 3 > m_curBufLen))

There is also an endless loop inside Peek():

[color=#008000;]// Retry read until response timeout expires[/color]

[color=#0000FF;]if [/color](m_stream.Length > 0) [color=#0000FF;]while[/color] (i < m_buffer.Length && (noRead = m_stream.Read(m_buffer, i, ([color=#0000FF;]int[/color])(m_buffer.Length - i < m_stream.Length ? m_buffer.Length - i : m_stream.Length))) == 0)
{
  i += noRead; [color=#ff0000;]// gets stuck here[/color]
}

}

Fixing that with:

[color=#0000FF;]if[/color] (m_stream.Length > 0 && (m_stream.Position != m_stream.Length))

However, this probably breaks if you are reading from a network stream or something.

Anyways, here's a quick & dirty line reader:

http://pastebin.com/GpNy0Yr1

I have confirmed this defect in StreamReader.

It looks like you will have to read the filestream directly to get around it.

[color=#0000FF;]int[/color] lineCount = 0;
[color=#0000FF;]var[/color] files = System.IO.[color=#2b91af;]Directory[/color].GetFiles([color=#a31515;]"SD"[/color]);
[color=#0000FF;]using[/color] ([color=#0000FF;]var[/color] fs = System.IO.[color=#2b91af;]File[/color].OpenRead(files[0]))
{
[color=#0000FF;]var[/color] buffer = [color=#0000FF;]new[/color] [color=#0000FF;]byte[/color][1024];
[color=#0000FF;]int[/color] readLen = 0;
[color=#0000FF;]while[/color] ((readLen = fs.Read(buffer, 0, buffer.Length)) > 0)
{
[color=#0000FF;]for[/color] ([color=#0000FF;]int[/color] x = 0; x < readLen; ++x)
{
[color=#0000FF;]if[/color] (buffer[x] == [color=#a31515;]'r'[/color])
{
lineCount++;
}
}
}
}
[color=#2b91af;]Debug[/color].Print(files[0] + [color=#a31515;]" - Lines: "[/color] + lineCount.ToString());