C # .net Error Looping throgh a Enumerator

Question

I created a .bat file that displays the server terminal Service SessionID and Username. Im displaying information in a datagrid

Here is the output of the .bat file:

C: \ Documents and Settings \ adcock> qwinsta / server: ilsap01
 SESSIONNAME USERNAME ID STATE TYPE DEVICE
 console 0 Conn wdcon
 rdp-tcp 65536 Listen rdpwd
                   Jrodriguez 27 Disc rdpwd
                   pbahena 8 Disc rdpwd
                   tfurr 3 Disc rdpwd
 rdp-tcp # 2187 kchild 14 Active rdpwd
                   Trhodes 10 Disc rdpwd
                   ajordan 16 Disc rdpwd
                   Trhodes 11 Disc rdpwd
 rdp-tcp # 2191 rluna 15 Active rdpwd
 rdp-tcp # 2192 lcathey 17 Active rdpwd

---

the only information I want to display is SessionID and Username, which work somewhat with the code below.

protected void Button1_Click(object sender, EventArgs e)
{
    System.Diagnostics.ProcessStartInfo psi = new      System.Diagnostics.ProcessStartInfo(@"C:\listfiles.bat");
    psi.RedirectStandardOutput = true;
    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
    psi.UseShellExecute = false;
    System.Diagnostics.Process listFiles;
    listFiles = System.Diagnostics.Process.Start(psi);
    System.IO.StreamReader rawUserData = listFiles.StandardOutput;
    listFiles.WaitForExit(30000);
    try
    {

        DataTable table2 = new DataTable();
        table2.Columns.Add(new DataColumn("UserName", typeof(string)));
        table2.Columns.Add(new DataColumn("SessionId", typeof(string)));

        String myString = rawUserData.ReadToEnd();
        string exp = @"([\w_]+)"; ;


        MatchCollection matches = Regex.Matches(myString, exp,RegexOptions.IgnoreCase);

        IEnumerator en = matches.GetEnumerator();

        while (en.MoveNext())
        {
            Match match = (Match)en.Current;

            if (en.Current.ToString() == "rdpwd")
            {
                en.MoveNext();

                Match match_Item = (Match)en.Current;

                string item = match_Item.Value;

                en.MoveNext();

                Match match_Item2 = (Match)en.Current;

                string item2 = match_Item2.Value;

                DataRow row = table2.NewRow();
                row[0] = item.Split()[0];
                row[1] = item2.Split()[0];
                //row[1] = item.Split(',')[1];
                table2.Rows.Add(row);

                //en.MoveNext();
                //break;

            }


        }

        this.displayUsers.DataSource = table2;
        this.displayUsers.DataBind();
    }

    catch (Exception ex)
    {
        Response.Write(ex);
    }

The error I get is: Enumeration either has not started, or has already been completed.

I set a breakpoint and it fades out that the while loop ends but starts, and after it adds a couple of duplicate entries, it throws an error. any ideas on what might be causing this. I think my RegEx

Answer 1

You call MoveNext twice inside the loop. This is causing a problem.

, MoveNext, "rdpwd", MoveNext , , , . MoveNext , , .