Hi Nicholas,
I'm trying to copy/paste the most relevant parts. All ErrorHandling has
been removed. Basically, we need to know only the two EventSinks for the
following BackgroundWorker events:
- DoWork
- RunWorkerCompleted
This is the EventSink for the DoWork event:
private void OnWorkerStart(object sender, DoWorkEventArgs args) {
// the DBWorkerArgs contain two public fields which are
// quite selfexplanatory: ConnectionString and Query
DBWorkerArgs workerArgs = (DBWorkerArgs) args.Argument;
// open connection
SqlConnection con = new SqlConnection(workerArgs.ConnectionString);
con.Open();
// run the query again, checks on the SqlConnection ommitted...
SqlCommand cmd = new SqlCommand(workerArgs.Query, con);
SqlDataReader reader = cmd.ExecuteReader();
// to make the Results available in the
// BackgroundWorker.RunWorkerCompleted event, we put them
// into the args.Result
args.Result = reader;
con.Close();
// done...
}
This is the EventSink for the RunWorkerCompleted event:
private void OnWorkerCompleted(object sender,
RunWorkerCompletedEventArgs args) {
// typechecking omitted
SqlDataReader reader = (SqlDataReader) args.Result;
// _ResultList is a ListView Control on the Form
_ResultList.Items.Clear();
_ResultList.Columns.Clear();
// columns first
int nFieldCt = reader.FieldCount;
for (int i = 0; i < nFieldCt; i++) {
_ResultList.Columns.Add(reader.GetName(i), 100);
}
}
Both methods are located withing Form1.
Thanks already for looking into my issue :)
Matthias
Nicholas Paldino [.NET/C# MVP] wrote:
Matthias,
Can you show an example of how you are using the BackgroundWorker class?
AFAIK, you shouldn't have an issue if you create a SqlDataReader and pass it
around (the OleDb provider I can understand, but not the SqlProvider).
