WPF User Control Is Causing Out Of Memory Exception?
Mar 8, 2010
I have created a windows form based application and I want the form to add a user specified amount of user controls (with textboxes) on to a panel. The user can then click some button and the controls on this panel are cleared and new ones are added. The user does something and the process is repeated. Now, I wanted these textboxes to support spell checking and looked all over for a free solution.
WPF textboxes support spell checking where the ones in regular win forms do not. I thought I would be able to use these WPF textboxes by adding them to an ElementHost object which is, in turn, within a panel. This panel would be a user control.
So, in my application, I would be able to add instances of these user controls onto the form and make use of .NET's spell checking goodness. This actually worked but after using the application for a while, found that the application would eventually freeze on me due to out of memory errors. I have pinpointed the memory errors to these WPF controls since this problem does not happen with normal textboxes.
When the window is opened and the number of controls is specified, this is pretty much how the controls are added:
Dim xOffset As Integer = 0
For i As Integer = 0 To theNumber
Dim myUserControl As New SpecialUserControl()
[Code].....
There are a lot of results on the internet when I tried to find a solution and I'm thinking that the problem I am having is due to the fact that the WPF control is not going away even after clearing the panel. Following this conclusion, I have tried different solutions regarding disposing these controls or setting them to nothing but the memory problem keeps occurring.
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Dec 5, 2011
I managed to get a program I made up and running fine, but i noticed it has a small memory leak somewhere. I looked through the code and I think its coming from somewhere in this
vb
Private Sub Button4_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
[code].....
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Nov 2, 2010
I'm currently testing an application that I've just finished developing and i seem to have a memory leak problem that i can't figure out. If i left open Windows Task Manager i can see that the process WMIService.exe is constantly taking more and more
memory. Starting from 40 000K, it was at 590 000K after 5 days.I was able to figure out which part of the application is causing me problem. So i've made a smaller application to figure out the problem but i just can't find the problem. Here is the code:
Private Sub WmiStartToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles WmiStartToolStripMenuItem.Click<br/>
LaunchWMI()<br/>
End Sub<br/>
[code]....
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Aug 26, 2010
I have an application putting new data into a database so I want to use a DataGridView to display the data. I have a timer triggering every 5 seconds and running this UpdateGridFromDatabase() routine every cycle.
It works, but I can see my application memory usage going up by 10kB every 5 seconds until my computer with 6GB of RAm & 64 bit Windows 7 grinds to a halt! Can anyone see at a glance what I am doing wrong? I am trying to open & close everything as necessary. I have also dimmed two variables outside - I had then inside previously and it didn't make any difference.
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Nov 3, 2011
I am working on a user control. Embedded in my user control is another user control. All of a sudden while programming some simple stuff I get an "out of memory error message". I can no longer load my project (after reboots etc.). I start a new project, copy the control.vb files into a new project folder.. add then add the control to the new project. Ican view the design and the code of the control. When I attempt to drag the control onto another control in the same project I get an error message
"Failed to create component... 'system.outofmemoryexception. Out of memory".
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Apr 22, 2010
A developer has created a custom control in ASP.NET using VB.NET. The custom control uses a repeater. In certain scenarios, the rpt_ItemDataBound event is encountering a data error. My goal is rather than having the user see the yellow screen of death, give the user a friendlier error explaining exactly what the data error is. I figured I would be able to use a Try/Catch block as shown below throw the exception, however, it appears that the event has nowhere to be thrown to and stops executing at the "End Try" line.
Protected Sub rpt_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rpt1.ItemDataBound, rpt2.ItemDataBound
Try
ProcessBadData...
Catch ex As Exception
Throw ex
End Try
End Sub
In VB.NET, I can find where the repeater's DataSource is being set, however, I can not find a DataBind event. How I can capture the exception in this ASCX control so I can report it to the user. The stack trace looks like this. There is another repeater within the repeater that is actually causing the error (rptOther) and I'm able to catch the error, but I can only throw it to the rpt_ItemDataBound. How rpt_ItemDataBound is getting called without a DataBind event.
at Company.WebForms.Control.rptOther_ItemDataBound(Object sender, RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.OnItemDataBound(RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)
at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource)
at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.Repeater.DataBind()
at Company.WebForms.Control.rpt_ItemDataBound(Object sender, RepeaterItemEventArgs e)
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Sep 23, 2009
For the life of me i can't figure out why this is throwing a first chance exception error. The error I'm getting in the immediate window is
Quote:
A first chance exception of type 'System.ArgumentException' occurred in Microsoft.VisualBasic.dll
[code].....
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Feb 5, 2012
I have a really simple user control.Using the Designer I put two TextBoxes on it, nothing else.Here's the entire .vb file for this user control:[code]
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Sep 2, 2011
I have a bit of code that jumps around a few domains and adds a user to each of them. This follow is a piece of code I had to write to get around the issue of the .add and .invoke being ran asynchronously and occasionally causing errors.
It connects to the domain in question, passing a "CN" from the code in as a search filter but receives a COMException which is normally a LDAP sting config issue. The connection string in this is fine so I am not sure why it is having such a hard time.
Function GetUser(ByVal UserId As String) As DirectoryEntry
Dim objRootEntry As New DirectoryEntry
objRootEntry.Path = "LDAP://DC=SERVER,DC=LOCAL"[code]....
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Mar 9, 2010
We are trying to implement Source Control with Visual SVN, Tourtoise, and Ankh. All works well once a project is placed in the repository. But, when you try to open a project stored on your local client, that is not stored in the repository, Visual Studio freezes up. (VS2008)
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Feb 21, 2010
We are trying to implement Source Control with Visual SVN, Tourtoise, and Ankh. All works well once a project is placed in the repository. But, when you try to open a project stored on your local client, that is not stored in the repository, Visual Studio freeze
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Jun 10, 2009
I am pretty new to Visual Basic and am only using it to create a very simple programme. It is essentially an interactive encyclopedia where the user can type in a subject into a text box and get a form with information on it to pop up. I am not using any data sets etc. While the forms are all very simple and the code very limited there are dozens of forms involved, this was working fine until recently when I started to run into OutOfMemoryExceptionThrown every time I try to build my program and debug it. This exception started appearing sporadically with the programme sometimes compliling fine and other times refusing to but now it is every time. I have never written code to do this before so how do I got about freeing up memory? I read in a similar post that it may be connected to allocating memory and then not freeing it up again, or perhaps having too many event handlers in my program without ending them, however I am lost and don't know how to fix these problems.
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Jun 22, 2010
I am writing some code to retrieve data from SQL Server, including an image field. I load the retrieved image data into a byte array and then convert the array into an image. Finally, I want to show a thumbnail of the image in a picturebox control on my app's form. All this works perfectly on my dev machine running windows 7, but the following code:
Dim myblankCallback As Image.GetThumbnailImageAbort = New Image.GetThumbnailImageAbort(AddressOf blankCallback)
PictureBox1.Image = newImage.GetThumbnailImage(180, 180, myblankCallback, New
[Code]....
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Oct 28, 2010
I always get an out of memory exception with my drawings...I read somewhere that I have to dispose my graphics to diminish the amount of memory used by the system.
I have the onPaint event and in there I call my functions with
Dim g as Graphics = e.Graphics
draw_all(g)
So in fact I have to dispose the e.Graphics every time he has to be repainted. Now my question how can I do that, because when I write before the draw_all function g.Dispose, that doesn't work, because he deletes the declaration of g and he doesn't know anymore what it is. If I dispose it after the draw_all function, he doesn't want to draw either.
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Jun 2, 2010
I dying trying to resolve this - its got so bad im unable to perform alot of my work. I keep getting an Out of Memory Error exception.
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Sep 1, 2011
I created a TaskBar application in Visual Studio which minimizes itself inside the system tray and show notifications to the user based on the database change. Whenever a new task assigned to the user he will notified at the system tray like a balloon popup. But whenever the applications runs for an average 15 hours time suddenly my applications crashes and shows out of memory exception.How can i debug this issue ? I can't wait for 15 hours and check for this issue? Is there any tool available to check the memory leakage of my application which can directly point at my issue? How can i generate out of memory exception to my program so it will be debugged easily and fast?
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Sep 4, 2009
I got an out of memory exception in a photo editor thingy i was making in vb.net. The bitmap image is constantly changing, and I always Dispose() of it after it has been sent off to the other bitmap. Is it being stored in a temp folder and using up all my space on the computer, or what? It always bugs after about 8 bitmaps have been drawn.
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Jan 27, 2012
I have a form created to act as a signature form. It will be used on an iPad via Citrix and that's not negotiable per my job so please don't make suggestions about developing it with Apple software. Anyway, on to the issue:Since this will be on an iPad I cannot use an OnMouseDown event to handle the drawing with the form. It consists of a PictureBox where the signature will occur. It works fine unless the user gets "draw happy" and starts drawing for a while. After a little time an Out of Memory Exception occurs and the program crashes.[code]
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Oct 26, 2011
I have an application that listens for connections asynchronously. When a connection comes in, it spawns a new thread from the callback method. This works fine for up to about 13 simultaneous connections then it dies with an out of memory error. The threads that are spawned just do a CHAP handshake and authenticate then go in to a command loop where they sleep until a command comes in or a timeout occurs. I have pasted the code below. Sometimes it will not throw an error but the thread never gets spawned although the connection is accepted.
Code:
Imports System.Net.Sockets
Imports System.Threading
Public Class UpdateMonitor
[Code]....
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Jun 12, 2011
I am working with application for Excel sheets in vb.net.My database is Sql server 2005.I am having around 8 lakhs of rows in my database and 64 columns.when I import a excel sheet for searching the Duplicate of excel sheet rows in database i get this Error System Out of Memory Exception.What is the reason to occur this kind of Error.Is it due to Excess of rows in database or coding error in Application.
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Jun 25, 2010
I have the following sub where i am reading in a 250mb file of dictionary words in a list, for example
Aardvark
Because
Count
[Code]....
As you can see i am wanting to use linq to remove duplicates, and also because i want to use the union and except statments elsewhere.
The above is fine if the filesize is about 150mb but with 250mb it throws a out of memory unhandled exception, on 'sWriter.Writeline(sline).
I am thinking this would need to be inside the loop, but cant work out how include my linq statement also.
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Mar 21, 2010
i'v got a problem with the Report Viewer form .NET 2008. I'ave to get Some 100000 Records for my company for a year dump report.The problem is i get the OutOfMemory Exception on the design of report.I get only the column i need and i use a Dataset to display.
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Oct 3, 2011
I have a desktop application in vb.net 2003. Here when we load the main screen we find an unhandled exception showing out of memory, but we are able to continue working off the form and retrieving data. It works fine, but the image is not getting loaded.In the main screen we have a background image loaded, one of the images is animated
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Apr 9, 2010
I have some code that uses the Windows Media Player Library capabilities to get around using ID3 tags. I keep getting this error however, whenever I add 1000+ songs to the datagridview:
For Each File_FullPath As String In My.Computer.FileSystem.GetFiles(My.Settings.Path, FileIO.SearchOption.SearchAllSubDirectories, "*.mp3", "*.m4a")
Dim WMP As New WindowsMediaPlayer
WMP.URL = File_FullPath
[code]....
Here is the code I'm using that gets the error:The problem is I need a way to clear the WMP.mediaCollection, but I don't know how.
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Jan 31, 2011
I am using the following piece of code to load images as thumbnails to a FlowLayoutPanel control. Unfortunately i get an OutOfMemory exception.As you already guess the memory leak is found at line
Pedit.Image = System.Drawing.Image.FromStream(fs)
So how could i optimize the following code?
Private Sub LoadImagesCommon(ByVal FlowPanel As FlowLayoutPanel, ByVal fi As FileInfo)
Pedit = New DevExpress.XtraEditors.PictureEdit
Pedit.Width = txtIconsWidth.EditValue
[code]....
Update: The problem occurs while loading a number of images (3264x2448px at 300dpi - each image is about 3Mb's)
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Jan 31, 2011
I have read through many of the questions related to my situation but I have not found one that does. I currently have a repeater with 4 bound items to it, clicking on a button in the repeater causes my error, below is the markup and codebehind. Can someone explain to me why this is happening and the fix for it? (I have excluded the page decleration and just included the page_load event. let me know if i should cut and past full code in)
[Code]...
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Sep 30, 2010
I've seen other people that have had this exception post on the forums, but none have had it happen like my situation. So I have a multi-threaded VB.net app that will have the protected memory exception occur while it's in the Thread.Sleep call.
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Nov 26, 2011
I have searched other forums, google, etc. and have not find a solution. I am creating a VB.NET application using Visual Studio 2010. My application runs fine inside the IDE. Outside of the IDE, it crashes immediately with an OOM exception. I have compiled the program in both VS 2010 and VS2008. The outcome is always the same. I increased my Desktop heap to 12288 meg from 3072 meg thinking that was the issue, but the outcome is the case. Although the increase does improve my response in the IDE. The error is also being reported as related to mscorlib.dll; and my version is for 2.0 framework is 2.0.50727 and for 4.0 framework is 4.0.30319. I am running Windows XP/SP3.
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Feb 18, 2010
I am retrieving a large BLOB and keep getting an Out Of Memory Exception. It occurs when I use a SqlDataReader to either check if the column is NULL, or if I try to read it and assign it to a Byte type of parameter, or if I use Response.BinaryWrite.
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Jun 9, 2010
I am trying to deserialize an object represented as an array of bytes - but I get a Out of Memory Exception. Whats causing this?
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