Backgroundworker progresschanged not updating

15-Jul-2016 17:04 by 2 Comments

Backgroundworker progresschanged not updating - consolidating server

Add(D(0), D(1), D(2), D(3)) ' Not used per above line Main Grid. That means that any routine that is called by Do Work cannot use them. Report Progress(1, Received Line "~xxx") Send TCP(network Stream, Received Line, request Count) Received Line = "" Else Received Line = data From Client. Flush() End Sub End Class End Module This setup gives me the same result as when I had everything in one. Looking at the count of rows in Main Grid, it does increase with each time I send the string. The only change after adding the control was to change its name to Main Grid. I tried putting it back to Data Grid View1 but no difference. Therefore, if you are working with the default instance of forms, you could easily be creating a new instance of the form from any thread, in which case any form-level variables in that form would also be effectively thread-specific because the form itself was and the variables are part of the form. What you would need to do would be something like this: Add a button to the form with the click event holding something like Messagebox. If that is the case, you would have pretty good proof that the grid that had the new record added to it was not the one you were seeing. My Code Bank Submissions: How to create a User Control | Move a form between Multiple Monitors (Screens) | Remove the MDI Client Border | Using Report Viewer with Visual Studio 2012 Express Ok, still, all of those variables are declared in the UI thread. The string is received, Progress Changed is called and the information can be displayed in that sub using Msg Box. But, when I add it to the datagridview (Main Grid) nothing appears. My Code Bank Submissions: How to create a User Control | Move a form between Multiple Monitors (Screens) | Remove the MDI Client Border | Using Report Viewer with Visual Studio 2012 Express That worked for me so I'll consider this resolved (as far as the forum). ) and then modify my original one until I get it to work. That talk about moving things to a module made me think of one exception to that which can make it look like variables are thread local (variables that are declared within a method, and are therefore local variables, ARE thread local, but variables outside of the thread are not): Default instances of forms are thread specific. I expect that you would see that the count when you do that is exactly the same as the number of rows you are seeing, rather than being the increased count you saw in the Progress Changed event.

And yes, I execute Invalidate Visual, hoping to force the label to refresh, somehow it does not work. Invalidate(), which does not work most of the time.

I have the static variable to reduce the repeated UI updates, hoping that it would reduces the resource usage.

Unfortunately, I could only see the Label update with "Progress: 100%" after the Do Work event completed.

The data is there in D(x) and the row count increase for each time it gets a line but nothing shows in the datagrid. User State, String) Msg Box(Received Line) ' -----This shows the correct full string with ~ delimiters D = Received Line. Row is increased by count but does not display ' in the form1 grid Msg Box("Rows " Main Grid. To String) Msg Box("data is " D(0) " " D(1) " " D(2) " " D(3)) ' currently only using the first 4 variables until it works Me. This is a newbie question (which is the main problem here) but if I declare those variables in Do Work, they are not seen by Start Client or Do Chat as they are only available to Do Work. Either of these would be pretty hard to achieve deliberately, let alone by accident.

Accept Tcp Client() Dim client As New handle Clinet client.start Client(client Socket, Convert. Progress Changed Dim D(20) As String Dim Received Line As String = "" Received Line = CType(e. Msg Box above and here shows the data both as ' Received Line and D. These cannot be accessed by any routine that is called by your backgroundworker: Ok. To String(request Count) server Response = "Server to clinet(" R ") " send Bytes = Encoding. Or else, perhaps the count of rows is arbitrarily not the actual number of rows that are in the grid.

I'm not quite sure what happens when the Report Progress event is raised, and it seems really improbable that the paint message is not getting through, but . Unfortunately, the other possibility doesn't seem quite right to me either, which is that you are updating the wrong grid. I have a statement in the Load functions that adds data and that appears normally. Click (rate this post) under my name if I was helpful. The main issue I am having is why is this information available to Msg Box both as the full line (Received Line in Progress Changed) and I can split the line into variables. Those variables are only in that sub and also do not show up in the grid although the row count increases. Everything that is called by Do Work needs to be self contained without relying on resources that are provided by the UI thread. I ran into the issue with default instances a few days ago, which is how I spotted the problem.

There is only one grid in the forms so has to be that one. I even went to the form, deleted the Data Grid View that was names Main Grid and then placed another grid called default Data Grid View1. Count show the rows are added, the data D(x) is populated but nothing actually appears in the grid. My Code Bank Submissions: How to create a User Control | Move a form between Multiple Monitors (Screens) | Remove the MDI Client Border | Using Report Viewer with Visual Studio 2012 Express First, doing Me. There are a few items like that but got stopped with the basic routines not working. I since changed it to be declared in Progress Changed. Edit: Sorry, in your case it needs to be declared in Do Chat() Show the love! It does everything but show the values in the datagridview. Add("a", "b", "c", "d") when placed in Progress Changed? So, though I don't know the details of how it is happening (JMC could probably explain it better), you are almost certainly adding the row to the wrong grid, and by adding that button you'd be able to prove it. To String) End Try End While End Sub Yeah, you are updating the grid in the Progress Changed event, which should be right. That will show you the result of that statement, which is the Rows collection. Count property to see how many rows are currently there. If you see that it is one higher than it was before then you know that the line was added. I assume that you are getting no error message, either. Add(D(0), D(1), D(2), D(3)) When execution stops at the breakpoint, the line has not yet executed, which is what you want. At that point, go back and repeat those steps to see what Me. My Code Bank Submissions: How to create a User Control | Move a form between Multiple Monitors (Screens) | Remove the MDI Client Border | Using Report Viewer with Visual Studio 2012 Express Ok - regroup.... Progress Changed, Address Of Background Worker1_Progress Changed Module1. To String) ' ' Here I loop through the grid and the result shows each row with the correct first column ' but nothing is shown in the datagridview of form1 ' ' this tries to add to Main Grid. RVideo was originally declaring variables inside the form class and then accessing them from procedures that were run by the backgroundworker. As proof, the only change I made to the original code was to move the variable declarations inside the subs and the thread is now resolved. Click (rate this post) under my name if I was helpful. Substring(0, 1) End If Catch ex As Exception Msg Box(ex. You also say that the messagebox is showing correctly, which is interesting. Then close that window and press F11, which will step forward one line. At that point, the question becomes: Why can't you see it? Edit: Sorry, in your case it needs to be declared in Do Chat() Dim cl No As String Dim server Socket As New Tcp Listener(8888) Dim client Socket As Tcp Client Dim counter As Integer Dim request Count As Integer Dim bytes From(10024) As Byte Dim data From Client As String Dim send Bytes As [Byte]() Dim server Response As String Dim r Count As String Dim Rtn String As String = "" Dim D(20) As String Private Sub Form1_Load(sender As System. Click (rate this post) under my name if I was helpful. Do Work, Address Of Background Worker1_Do Work Add Handler Background Worker1. Add("a1", "b1", "b2", "b3") Catch ex As Exception Msg Box(ex. Accept Tcp Client() Dim client As New handle Clinet client.start Client(client Socket, Convert. In my case, I moved the properties outside of the form into a module and the entire application works flawlessly with three backgroundworkers. Message) End Try End Sub I set up the background worker and in the server sub I have reportprogress. I assume that you are getting no error message, either. Add(D(0), D(1), D(2), D(3)) When execution stops at the breakpoint, the line has not yet executed, which is what you want. At that point, go back and repeat those steps to see what Me. I have the same issue that the grid will not show any update even though if I count rows they do increase. Progress Changed Dim D(10) As String Dim Received Line As String = "" Received Line = CType(e. Msg Box above and here shows the data both as ' Received Line and D correctly. I'm curious how it could do this without throwing an exception. You also say that the messagebox is showing correctly, which is interesting. Then close that window and press F11, which will step forward one line. At that point, the question becomes: Why can't you see it? What I would do would be to put a breakpoint on the key line: Me. I took the code and separated the tcpserver from the main UI form1 and into a module. Run Worker Async() End Sub Private Sub Background Worker1_Do Work(sender As System. Main() End Sub Private Sub Background Worker1_Progress Changed(sender As Object, e As System. Progress Changed Event Args) Handles Background Worker1. Same results, it is added and when ' the for each row above comes around again it shows this line. My Code Bank Submissions: How to create a User Control | Move a form between Multiple Monitors (Screens) | Remove the MDI Client Border | Using Report Viewer with Visual Studio 2012 Express I agree.I have looked and looked but something is just not clicking. Ok - the way I read it was the Do Work could not talk directly to the UI which is why I was doing it this way. Accept Tcp Client() Dim client As New handle Clinet client.start Client(client Socket, Convert.

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