Re: How Do I: 'System.ObjectDisposedException'
- From: kimiraikkonen <kimiraikkonen85@xxxxxxxxx>
- Date: Mon, 14 Apr 2008 10:28:13 -0700 (PDT)
On Apr 14, 8:25 pm, kimiraikkonen <kimiraikkone...@xxxxxxxxx> wrote:
On Apr 14, 8:09 pm, Brian <LineSupp...@xxxxxxxxx> wrote:
Hello all.
I have a simple application that I was using to test and understand
the System.Timers.Timer and noticed that when I stop the application,
on occasion, it throughs the following exception.
An exception of type 'System.ObjectDisposedException' occurred in
System.Windows.Forms.dll but was not handled in user code
Additional information: Cannot access a disposed object.
Should I just place the offending line in a Try Catch or set the timer
to nothing in FormClosing. Below is the code, real short.
Public Class formMain
Dim c As New Chronology
Dim WithEvents UpdateTmr As System.Timers.Timer
Dim StartTime As Date
Dim BlockWindowStart As Date
Dim BlockWindowEnd As Date
Private Sub formMain_Load(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles MyBase.Load
UpdateTmr = New System.Timers.Timer
UpdateTmr.Interval = 1000
UpdateTmr.Enabled = True
StartTime = DateTime.Now
BlockWindowStart = StartTime.AddSeconds(10)
BlockWindowEnd = BlockWindowStart.AddSeconds(10)
End Sub
Private Sub UpdateTmr_Elapsed(ByVal sender As Object, ByVal e As
System.Timers.ElapsedEventArgs) Handles UpdateTmr.Elapsed
'Exception is thrown
here.<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Me.Invoke(New delUpdateForm(AddressOf UpdateForm))
End Sub
Public Delegate Sub delUpdateForm()
Public Sub UpdateForm()
Label1.Text = Now
Dim x As DateTime = DateTime.Now
Dim tsw As TimeSpan = BlockWindowEnd - BlockWindowStart
Debug.Print("Block Window Value: " & tsw.Ticks)
Dim ts As TimeSpan = DateTime.Now - BlockWindowStart
Debug.Print(ts.Ticks)
Debug.Print(DateTime.Now >= BlockWindowStart And DateTime.Now
<= BlockWindowEnd)
End Sub
End Class
Brian,
I tried your code and works fine if you remove the unused class called
"Chronology" at the top of your codepage, because i get "Chronology
not defined" error which you might referenced to an exernal library.
So, i noticed that your code presents the current date and time in the
progress of being updated.
Would you mind using this instead of the code you have if you're still
having difficulty?
Place a timer control named timer1 then paste the following code:
' -------------- Begin ------------
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Timer1.Tick
Label1.Text = DateString + " " + TimeString
End Sub
End Class
' ------------- End ----------
As i noticed that does pretty same job with your code.
Hope this helps,
Onur Güzel
Note, don't forget to set timer's interval to 1000 miliseconds.
.
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