Compare string against a list of strings

Question

Hello

Working on a custom storage parser that will save its streams on disk, name is taken from internal stream name.

To make sure it's not of these:

CON, PRN, AUX, NUL, COM0, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT0, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9

What's the fast and short way to store the above strings and compare with my file name to make sure it's not one of them?

vb.net 2010 .net 4.0

Thanks for advise :)

Answer 1

Hi

Don't know about 'fastest' as I have not tried multiple methods, but I would have tried something like this.

    Dim forbidden() As String = {"CON", "PRN", "AUX", "NUL", "COM0", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT0", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"}
    Dim filenames() As String = {"lpt5", "com", "com2", "lpt", "aux"}
    Dim hold As String = String.Empty
    For Each filename As String In filenames
      If forbidden.Contains(filename.ToUpper) Then
        hold &= filename & "  "
      End If
    Next
    MessageBox.Show("Forbidden filenames" & vbCrLf & hold)