Today I was faced with the need to determine the number of lines within a StringBuilder instance.  If I had needed the length of the string contained within the StringBuilder, that would have been a trivial task.

After perusing MSDN, I was unable to find a property or method of the StringBuilder class that provided the needed behaviour.  You would think that this would be accessible via something like StringBuilder.Lines.Count, but no luck.

So, I figured out a hack of sorts.  If you first create a text box control (within code), you can determine the line count from the control.

...

private int GetLineCount(StringBuilder sb)
{

    TextBox ctl = new TextBox();
    ctl.Text = sb.ToString();

    int lineCount = 0;

    foreach (String s in ctl.Lines)
    {
       lineCount++;
    }

    return lineCount;

}

...

Voila! The number of lines within a StringBuilder.  If anyone happens to know the 'correct' way of doing this from within the framework, please let me know.