[2005] 'System.StackOverflowException'

Good afternoon!

I have been receiving the below exception:

An unhandled exception of type 'System.StackOverflowException' occurred in System.Data.dll

My app has various text boxes that allows a user to enter certain criteria for fields to build a filter property for a datagridview.

Whenever the user enters more than 300 or so items (could be character limit, not sure), the above error occurs when they attempt to receive the records. Or maybe a limit on the amount of records it can return.

I can't seem to Catch the exception, and do the app just closes.

Looking at the 'View Detail' only shows the above exception message.

Any ideas?

Thanks!

the code i see looks correct. ;)

Sorry, didn't post the code because it doesn't appear to be a code issue, so much as a DLL issue. Liek some kind of limit. Need to know of a way to catch the error when it is from the DLL.

Here is the code it appears it is happening at (.NET is not pointing to any code when the error occurs, but when commented out, the rest of the code works)

Code:

---

        With dvOrigSRs
            .Table = dsCMT.Tables(My.Settings.CMTSTNDRDR).Copy
            .RowFilter = TFNFilter
            .Sort = CreateSortString()
        End With

---

How does CreateSortString look?

This is createsortstring:

Code:

---

Private Function CreateSortString() As String
        Dim l As Button
        Dim s As String = ""

        For Each l In ButtonSorts
            If l.Text <> "NS" Then
                If l.Text = "S^" Then
                    s = "ASC"
                Else
                    s = "DESC"
                End If
                Select Case l.Name
                    Case "butSortTFN"
                        s = "[TFN] " & s
                    Case "butSortMP"
                        s = "[M/P] " & s
                    Case "butSortAPPL"
                        s = "[APPL] " & s
                    Case "butSortPROD"
                        s = "[PROD] " & s
                    Case "butSortCNC"
                        s = "[CL/NCL] " & s
                    Case "butSortALTOFF"
                        s = "[ALT OFF] " & s
                    Case "butSortIBP"
                        s = "[IBP] " & s
                    Case "butSortOBP"
                        s = "[OBP] " & s
                    Case "butSortXFER"
                        s = "[XFER] " & s
                End Select
            End If
        Next

        If s = "" Then
            s = "[Sequence] " & "ASC"
        Else
            s = s & ",[Sequence] " & "ASC"
        End If


        Return s

    End Function

---

But its def not that code, as when i am testing the condition limit, i don't sort any columns.

Here is the code used to create the conditions:

Code:

---

  Private Sub RetrieveResults()
        Dim tLU As String = ""
        Dim LookUp As String = ""

        UpdateStatus("Creating lookup statement", True)

        LookUpSub(tLU, "TFN", txtTFNS.Lines)
        If tLU <> "" Then LookUp = tLU

        LookUpSub(tLU, "M/P", txtMP.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "APPL", txtAPP.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "PROD", txtPROD.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "CL/NCL", txtCNC.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "ALT OFF", txtALTOFF.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "IBP", txtIBPs.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "OBP", txtOBPs.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        LookUpSub(tLU, "XFER", txtXFERs.Lines)
        If tLU <> "" Then
            If LookUp = "" Then
                LookUp = tLU
            Else
                LookUp = LookUp & " AND " & tLU
            End If
        End If

        If LookUp = "" Then
            MessageBox.Show("You must choose at least one field to filter by. Thanks.", "No Filter Values Selected", MessageBoxButtons.OK, MessageBoxIcon.Information)
            UpdateStatus("Ready")
            Exit Sub
        End If

        LoadTFNorDNIS(LookUp)

    End Sub
    Private Function ConditionCount() As Long
        Return txtTFNS.Lines.Length + txtMP.Lines.Length + txtAPP.Lines.Length + _
              txtPROD.Lines.Length + txtCNC.Lines.Length + txtALTOFF.Lines.Length + _
              txtIBPs.Lines.Length + txtOBPs.Lines.Length + txtXFERs.Lines.Length
    End Function
    Private Sub LookUpSub(ByRef FilterText As String, ByVal FieldName As String, ByVal TextBoxLines() As String)
        Dim i As Integer

        FilterText = ""
        If TextBoxLines.Length > 0 Then
            For i = 0 To TextBoxLines.Length - 1
                If FieldName = "TFN" And (TextBoxLines(i) <> "(Blanks)") And (TextBoxLines(i) <> "(No Blanks)") Then TrimTFNChars(TextBoxLines(i))
                If FilterText.Contains(TextBoxLines(i)) = False Then
                    If TextBoxLines(i) = "(Blanks)" Then
                        If FilterText = "" Then
                            FilterText = "[" & FieldName & "] IS NULL"
                        Else
                            FilterText = FilterText & " OR [" & FieldName & "] IS NULL"
                        End If
                    ElseIf TextBoxLines(i) = "(No Blanks)" Then
                        If FilterText = "" Then
                            FilterText = "[" & FieldName & "] IS NOT NULL"
                        Else
                            FilterText = FilterText & " OR [" & FieldName & "] IS NOT NULL"
                        End If
                    Else
                        If FilterText = "" Then
                            FilterText = "[" & FieldName & "] = '" & TextBoxLines(i) & "'"
                        Else
                            FilterText = FilterText & " OR [" & FieldName & "] = '" & TextBoxLines(i) & "'"
                        End If
                    End If
                End If
            Next
            FilterText = "(" & FilterText & ")"
        End If
    End Sub

---

Currently using the condition count, against 370, as a workaround to try to avoid the error. But if it is a character based limit, then it could still error out depending on what conditions the user puts.

And when you hit the stack overflowexception in the debugger, what does the function list look like on the stack trace? (Call Stack window) While the exception is up -> Debug -> Windows -> Call Stack.

Like this:
> [External Code]

If all the stack trace says is that, then either your code is not loading into the debugger or the exception is happening in an external dll you are referencing. Check the internal Exception property of the exception perhaps?

Normally, this type of an error occurs when you have created an endless recursive call. Each function call will stick the current state onto the stack and get a little stack space, as needed. Thus, if you end up in an infinite recursion, then each iteration will stick more stuff onto the stack until the stack overflows. I would expect that the same thing is possible with limitted recursion, but I have never seen it. Unfortunately, the problem is being caused externally.

In the original snippet, why are you calling .Copy on the table?

Calling .Copy because i don't want changes made to the datagridview to actually change the working copy of the database. So i have a copy created for the DV.

But when i place messageboxes before and after the .RowFilter line of code, i only see the first messagebox, then it crashes.

With dvOrigSRs 'dv
.Table = dsCMT.Tables(My.Settings.CMTSTNDRDR).Copy
MessageBox.Show("BOB")
.RowFilter = TFNFilter
MessageBox.Show("FRED")
.Sort = CreateSortString()
End With

So, it is def related to the filter string having too many characters/conditions. But irritating that i can't put a 'catch' to catch it.

I can't see where an endless recursive call would come into play here since it is a SQL liek statement going to the RowFilter property.