Question

Quit the fill Process

Asked by: malanois

I have a search button.  When the button is clicked it performs a search.  i have another button called reset.  How can I stop the either the thread or db fill when the user clicks the reset.

Private Sub StartDoWork()
        Dim workThread As New System.Threading.Thread(AddressOf DoWork) <<<<<<<<<----End This preferably
        workthread.Start()
    End Sub



    Private Sub DoWork()

        showimage()
        DbDataSet.Clear()
        'OleDbConnection1

        If online.Netstatus = True Then
            Me.OleDbConnection1.ConnectionString = "Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Registry Path=;Jet OLEDB:Database L" & _
                        "ocking Mode=1;Jet OLEDB:Database Password=;Data Source=""Z:\TRDB2\TRDB.mdb"";Passw" & _
                        "ord=;Jet OLEDB:Engine Type=5;Jet OLEDB:Global Bulk Transactions=1;Provider=""Micr" & _
                        "osoft.Jet.OLEDB.4.0"";Jet OLEDB:System database=;Jet OLEDB:SFP=False;Extended Pro" & _
                        "perties=;Mode=Share Deny None;Jet OLEDB:New Database Password=;Jet OLEDB:Create " & _
                        "System Database=False;Jet OLEDB:Don't Copy Locale on Compact=False;Jet OLEDB:Com" & _
                        "pact Without Replica Repair=False;User ID=Admin;Jet OLEDB:Encrypt Database=False" & _
                        ""


        Else
            Me.OleDbConnection1.ConnectionString = "Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Registry Path=;Jet OLEDB:Database L" & _
            "ocking Mode=1;Jet OLEDB:Database Password=;Data Source=""C:\Program Files\TRDB\TRDB.mdb"";Passw" & _
            "ord=;Jet OLEDB:Engine Type=5;Jet OLEDB:Global Bulk Transactions=1;Provider=""Micr" & _
            "osoft.Jet.OLEDB.4.0"";Jet OLEDB:System database=;Jet OLEDB:SFP=False;Extended Pro" & _
            "perties=;Mode=Share Deny None;Jet OLEDB:New Database Password=;Jet OLEDB:Create " & _
            "System Database=False;Jet OLEDB:Don't Copy Locale on Compact=False;Jet OLEDB:Com" & _
            "pact Without Replica Repair=False;User ID=Admin;Jet OLEDB:Encrypt Database=False" & _
            ""
            '
        End If
        Me.OleDbDataAdapter1.Fill(Me.DbDataSet) <<<<<<<<--------------- Or end this
        '// Do your work here
        hideimage()


    End Sub

Thanks, MJ

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Asked On
2004-10-13 at 08:07:17ID21166785
Tags

quit

,

workthread

Topic

.NET

Participating Experts
4
Points
500
Comments
6

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Answers

 

by: planoczPosted on 2004-10-13 at 08:53:15ID: 12299533

Try something like this....

Private Sub StartDoWork()
      Dim workThread As Thread
        workThread = New Thread(New ThreadStart(AddressOf Me.DoWork))
        workThread.IsBackground = True
        workThread.Start()
 End Sub
 
  Private Sub btnReset_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnReset.Click
        If workThread.IsAlive = True Then
            workThread.Abort()
        End If
       Me.DbDataSet.Clear()      
       Me.Close()
    End Sub

 

by: Idle_MindPosted on 2004-10-13 at 09:15:42ID: 12299735

Just some minor modifications to planoczs code:

    ' must be declared outside of StartDoWork()
    ' if we want to abort it from btnReset_Click()
    Private workThread As Thread

    Private Sub StartDoWork()
        workThread = New Thread(New ThreadStart(AddressOf Me.DoWork))
        workThread.IsBackground = True
        workThread.Start()
    End Sub

    Private Sub btnReset_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnReset.Click
        If workThread.IsAlive = True Then
            workThread.Abort()

            ' wait for the thread to finish completely aborting <------------------------
            While workThread.IsAlive
                Application.DoEvents()
            End While

        End If
        Me.DbDataSet.Clear()
        Me.Close()
    End Sub

 

by: planoczPosted on 2004-10-13 at 09:37:12ID: 12299940

Thanks Idle_Mind,

Afterwards I was thinking that a Application.DoEvents() would make it work better.

 

by: Idle_MindPosted on 2004-10-13 at 09:45:49ID: 12300016

By the way, malanois, I have no idea if the process you are executing can be interrupted in this manner.  I was simply addressing the first half of your question:

>> How can I stop the either the thread or db fill when the user clicks the reset.

The setup presented will kill the thread, but if the

    Me.OleDbDataAdapter1.Fill(Me.DbDataSet)

call is a blocking one, then I don't know this will affect the code.

~IM

 

by: AvonWyssPosted on 2004-10-13 at 11:51:05ID: 12301298

Aborting threads usually only works when the thread execution is in managed code. So, if the actual lengthy DB operation is invokes via COM or even P/Invoke, your abort will not be executed until the call returns, at which point it's useless.

 

by: etmendzPosted on 2004-10-13 at 22:23:33ID: 12305322

ADO.Net v2 supports asynchronous and bulk processing features. It's gonna be exciting to move up to that version... Sigh...

But for now:

Remember that when you .Abort() a thread, you actually throw ThreadAbortException to the working thread. So what you can do is add something like this in DoWork() (in addition to Idle_Mind's suggestion above):

Try
 ... code to fill the dataset
Catch exc As ThreadAbortException
 ... so you can prove that abort is successful somehow
Catch exc As Exception
 ... so you can catch other kinds of exception
Finally
 ... so you can do something before leaving DoWork()
End Try

This doesn't really prove much. And the guys here are right in saying that Abort() is not guaranteed. But you can use the structure above so you know what is happening and do something about it...

Have fun...

20120131-EE-VQP-002

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