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Using Windows Forms progress bar - windows forms app

Posted on 2013-05-22
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Last Modified: 2013-05-23
I have progress bar on my applications.  It should update as a for next loop progresses.

How do i do it?
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Question by:vbnetcoder
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6 Comments
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 39188851
If you're running in the main UI thread:
Some Loop
    ... code ...
    ProgressBar1.Value = x
    Application.DoEvents()
End Loop

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You should move the code to a background thread though.  Again, take a look at the BackgroundWorker() control.  It has a ReportProgress() method which fires the ProgressChanged() event.  Search for it...examples abound!
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Author Comment

by:vbnetcoder
ID: 39188975
how will this code know what percentage of the total was just completed.

For example if the loop is going to be 10 times each time i want to move the bar by a tenth
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 39189051
Since you know how many times your loop is going to iterate, just divide the current iteration  number by the total number and multiply by 100 (a percentage!).  Then leave your progressbar at the default maximum of 100 and set it to the current "percentage" value.

Another option is to set the Maximum property of the progressbar to your desired number then call PerformStep() against it for each one (set the Step to 1).
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Author Comment

by:vbnetcoder
ID: 39189081
I not sure i am following you...


I have a variable name TotalCount that is the total amount of time it will loop


What would the code look like?
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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 39189094
Something like...
Dim percentage As Integer
For i As Integer = 1 to TotalCount

    ' ... some work ...

    percentage = i / TotalCount * 100
    ProgressBar1.Value = percentage ' <-- assuming default Min = 0, Max = 100
    Application.DoEvents()
Next

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Author Closing Comment

by:vbnetcoder
ID: 39190709
ty
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