/// <summary>
/// Pops a directory change off of the stack and returns to the previous working directory.
/// </summary>
private void popDirectory()
{
string currPath = (string)pathStack.Pop();
string newPath = pathStack.Count > 0 ? (string)pathStack.Peek() : m_path;
if (!currPath.Equals(newPath))//This optimization prevents needless CWD network I/O.
{
WinInet.FtpSetCurrentDirectory(m_hFtp, newPath);
}
}
/// <summary>
/// Pushes a directory change onto the stack if a directory change is successful.
/// This operation should be used to change directories because some FTP server
/// behave strangely when performing operations outside of the target directory.
/// This stack behavior makes it very easy for operations to transparently change
/// directories and then return to the previous directory.
/// </summary>
/// <param name="path">the directory to change to</param>
/// <returns>true if the directory change was successful</returns>
private bool pushDirectory(string path)
{
Trace.Assert(path.StartsWith(PathDelimiter, StringComparison.OrdinalIgnoreCase), "pushDirectory called with an unexpected (relative) path: " + path);
if (pathStack.Count > 0 && pathStack.Peek().Equals(path))
{
//then we're already in the specified directory, so just push
//the directory onto the stack and return true.
//This optimization prevents needless CWD network I/O.
pathStack.Push(path);
return(true);
}
bool success = WinInet.FtpSetCurrentDirectory(m_hFtp, path);
if (success)
{
pathStack.Push(path);
}
return(success);
}