UserControl MyBase.Paint - Works And Doesn't Work (Value Changed Via BackgroundWorker.ProgressChanged)
Mar 27, 2012
I have a UserControl that has a ProgressBar on it. The purpose of the UserControl is to be able to show the progress % on the ProgressBar as text. To do this it uses the MyBase.Paint event. To make it work the ProgressBar is made invisible and the UserControl is 'painted' with an image of the ProgressBar and then the text is painted on top. The UserControl has a Value property that is passed through to the ProgressBar.Value property.
I use this UserControl in two places, on a Splash form (not a standard Splash Screen) and also on the main form of the application. It works on the Splash form but not on the main form - by work I mean that changes to the ProgressBar.Value property cause the ProgressBar to show its progress. The cause appears to be that in the Splash form case the MyBase.Paint event is called as a consequence of calling Me.Refresh in the Set procedure of the UserControl.Value property, in the main form case it isn't,
i.e. Me.Refresh isn't causing MyBase.Paint to run.
The main form has two BackgroundWorker components. The first gets called (RunWorkerAsync) from Form_Load after the Splash form has been shown. The BackgroundWorker.ProgressChanged event updates the Value property of the UserControl and it works exactly as intended. The second gets called as a result of a user starting an operation and again the BackgroundWorker.ProgressChanged event updates the Value property of the UserControl but MyBase.Paint doesn't run so the ProgressBar remains resolutely static.
Any ideas why it won't respond to Me.Refresh in one case but does in the other? Happy to make any of the code avaialble but didn't want to fllod the first post with reams of it. Here's what I think are the most relevant code sections. First the UserControl
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Oct 13, 2009
[URL]
Occurs when ReportProgress is called.
but in my code ProgressChanged event doesn't fire after this line bgwBckp.ReportProgress(1)
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this is my code:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
For i = 0 To 1000
[code]....
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Now my problem is little weird since i am compiling and deploying this tool on windows xp machine but some of the users are using windows 7 64 bit machines and after running the program for about 5-10 minutes, it crashes on windows 7 with following error
Not enough storage is available to process this command and when i view details of that error, i get the following description.
See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.ComponentModel.
************** Loaded Assemblies **************
mscorlib
[Code].....
i am completely clue less for this error since this program works fine on xp but doesn't work on windows 7.
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See
Public Class Form1
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[CODE]...
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Dim mycuts() As String
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Private
Sub
xxx_Paint(ByVal
sender As
Object
[Code] .....
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Here is the original code that works just fine, but hangs up my app (hence the need to run a background process)Above the is an Imports RARNET to support this:
[Code]...
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C#
private void DoSomethingWithTheAlarm(G4T.enAlarmAction action) { XML_AlarmClearRequest[] ClearRequest = new XML_AlarmClearRequest[lstAlarms.SelectedItems.Count]; int idx = 0; foreach (ListViewItem lvItem in lstAlarms.SelectedItems) { ClearRequest[idx] = new XML_AlarmClearRequest();
[code]....
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This works:
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But this doesnt??
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Why? do I need to add something else?
I looked in the properties of the button but didnt see anything.
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[Code]...
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Why does this work
vb Private Function calcArea() As Decimal
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Dim width As Decimal
' assigns user input from the two text boxes to the two variables
Decimal.TryParse(heightTextBox.Text, height)
Decimal.TryParse(widthTextBox.Text, width)
[Code]...
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[Code]...
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I'm using the IsBusy property to determine when a backgroundworker has completed. In the RunWorkerCompleted event I assing the result of the RunWorkerCompletedEventArgs to a public variable within the module where the backgroundworker events reside. The trouble is, the IsBusy property occasionally becomes true before the public variable gets assigned the value of the RunWorkerCompletedEventArgs. I experimented with putting a Threading.Thread.Sleep(10) after the IsBusy property becomes true and it seems to fix the problem. But it really doesn't seem right that I should have to do this. What is wrong here? I have placed the backgroundworker events in a component that is instantiated from the windows form, instead of placing the background worker events within the code of the form itself.
Here is my code;
Function SendAndWait(ByVal IntegerArray() As Integer) As String
Component.BackgroundWorker.CancelAsync()
Do While Component.BackgroundWorker.IsBusy
[code]....
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Apr 14, 2011
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Private Sub BackgroundWorker2_ProgressChanged(ByVal sender As System.Object,
ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker2.ProgressChanged
Me.newlabel.ForeColor = Color.Cyan
[code]....
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To explain better, see my extremely simplified example of my issue:
Default.aspx
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
[Code].....
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