SetDataSource causes code reentrance (bug)

Question

Post Author: willi
CA Forum: .NET
Using CR.Net 1.1 SP2 (VS 2003 SP1), WinXP Prof/SP2Problem:Calling the SetDataSource method of a ReportDocument object causes code reentrance, probably due to processing the message queue. This can cause unexpected problems. The callstack in the following example shows that a Timer's Tick event occurs while calling the SetDataSource method:CSSReports.Form1.Timer1_TickSystem.Windows.Forms.Timer.OnTick   System.Windows.Forms.Timer.DebuggableCallback   CrystalDecisions.CrystalReports.Engine.ReportDocument.Load   CrystalDecisions.CrystalReports.Engine.ReportClass.Load   CrystalDecisions.CrystalReports.Engine.ReportDocument.SetDataSource   This must not happen! Other events could occur, too. Is there a hotfix for this problem? This is a serious issue because while loading one report I was able to select a MenuItem and open a 2nd report before loading the 1st report finished (not a multithreaded application). This behavior can just as many problems as explicitly calling Application.Doevents. In short: SetDataSource must not process any messages in the mesage queue.

Answer 1

It looks like the error only occurred when I used JUnit to test it - which was probably due to something I did.  When I managed to get the code working, the problem was that the newly added table got referenced by the next itteration. I solved it by using a HashMap.
Map<String, ResultSet> results = new HashMap<String, ResultSet>();
Tables tables = reportClientDoc.getDatabaseController().getDatabase().getTables();
for (int i = 0; i < tables.size(); i++) {
    String tableAlias = reportClientDoc.getDatabaseController().getDatabase().getTables().getTable(i).getAlias();
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    Connection con = DriverManager.getConnection("jdbc:odbc:CSV_DSN");
    Statement stmt = con.createStatement();
    String query = "select * from " + tables.getTable(i).getName();
    ResultSet rs = stmt.executeQuery(query);
    results.put(tableAlias, rs);
final Enumeration<String> aliasEnumeration = Collections.enumeration(results.keySet());
while (aliasEnumeration.hasMoreElements()) {
    String oldAlias = aliasEnumeration.nextElement();
    ResultSet rs = results.get(oldAlias);
    reportClientDoc.getDatabaseController().setDataSource(rs, oldAlias, oldAlias + "_rs");