• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 719
  • Last Modified:

.net Compact Framework: Assigning an & to a label throws out of memory exception

I'm having a problem in my .net CF 2.0 application.

When I open a specific form I do a search (via web service) and find a client and all of their memberships. If I find a membership, I update the UI to display start date, pass description etc...

I was testing to make sure it works with all special characters (&^@#!/\^) etc and I've found that when I assign an ampersand (&) to any of the labels on the form, the memory usage just grows and grows until an outofmemory exception is thrown.

This does not happen on any other form (from what I can tell) and I can't reproduce it in a basic application with just one form.

Another thing to note is that this form is shown as a dialog.

The code I'm running:

lblPassPlan.text = "Plan: "
lblPassPlan.text = lblPassPlan.text & "Gym && Swimming Pool"   <-- I've tried this with one ampersand as well, same thing. It throws the outofmemory exception on this line.

Here is the message from the exception:

            StackTrace      "at System.PInvoke.EE.FastAllocateString()
at System.String.GetStringForStringBuilder()
at System.String.GetStringForStringBuilder()
at System.Text.StringBuilder.GetNewString()
at System.Text.StringBuilder.Append()
at System.String.ReplaceOrdinal()
at System.String.Replace()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.lblPassPlan_TextChanged()
at System.Windows.Forms.Control.OnTextChanged()
at System.Windows.Forms.Control.set_Text()
at ClassWireless.formValidation.UpdateUI()
at ClassWireless.formValidation.GetClientPass()
at ClassWireless.formValidation.btnSearch_Click()
at System.Windows.Forms.Control.OnClick()
at System.Windows.Forms.Button.OnClick()
at System.Windows.Forms.ButtonBase.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.EVL.EnterModalDialog()
at System.Windows.Forms.Form.ShowDialog()
at ClassWireless.formMain.picMemberships_Click()
at System.Windows.Forms.Control.OnClick()
at System.Windows.Forms.Control.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.EVL.EnterMainLoop()
at System.Windows.Forms.Application.Run()
at ClassWireless.formMain.Main()
"      String


0
BlahMatt
Asked:
BlahMatt
  • 5
  • 4
1 Solution
 
Mikal613Commented:
try
lblPassPlan.text + "Gym && Swimming Pool"
0
 
BlahMattAuthor Commented:
Using + instead of & for the concatenation  throws the same exception.
0
 
Mikal613Commented:
Dim NewLabel as string = lblPassPlan.text + "Gym && Swimming Pool"

lblPassPlan.text = NewLabel
0
NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

 
BlahMattAuthor Commented:
OK... it doesn't throw an oom exception when I assign the string to a variable first

However it takes an abnormally long amount of time on that line of code (Assigning to the label) and then the labels text property is "" so the label doesn't appear.
0
 
Mikal613Commented:
Dim NewLabel as string = lblPassPlan.text & "Gym && Swimming Pool"
lblPassPlan.Text = ""
lblPassPlan.text = NewLabel

0
 
BlahMattAuthor Commented:
Assigning the labels text = "" didn't change anything from what I can tell.

Same behavior...

Dim sNewLabel As String = lblPassPlan.text & "Gym && Swimming Pool"
lblPassPlan.text = ""
lblPassPlan.text = sNewLabel (where sNewLabel = "Plan: Gym && Swimming Pool")

Here lblPassPlan.text is still ""
0
 
Mikal613Commented:
and if you do the same with a textbox ?

Can you create a new label and see what happens?
0
 
BlahMattAuthor Commented:
With a textbox it works and creating a new label worked.

I'm not certain what properties are different on that label that would cause that though. I can't find any.

I'm ok with just creating new labels though. Thanks Mikal!
0
 
Mikal613Commented:
No problem
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 5
  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now