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9.2

DataSet.HasChanges = False (sometimes)

Asked by bd9000 in .NET Framework 3.x versions, Microsoft Visual Basic.Net, .Net Editors & IDEs

Tags: VB.NET, Winforms, Visual Studio 2008, BindingSource, TableAdapter, DataSet

I have the maddening issue with the DataSet not showing changes as being made for some controls even after the BindingSource.EndEdit is called.
I have a combobox that, when a different selection is made, updates the underlying dataset, but the HasChanges is set to False.
I call the ProductBindingSource.EndEdit() method before calling the TableAdapterManager.UpdateAll(ProductsLocalDataSet) method.
Unfortunately, no matter what, the HasChanges is False!
As a test I created a copy of the DataSet to look at after the EndEdit method is called, the changes are 100% most definitely there, just the HasChanges flag is never set.

Even stranger, some combos, textboxes work just fine.
I've tried deleting the dataset, tableadapter, combo & bindingsource completely, removing all references, then putting them back in with no luck.

Is there some way to just force the dataset's HasChanges flag to TRUE, regardless?
I notice it is readonly, so there is no luck there.  
I've spent 24hours on this problem with absolutely no luck at all - makes no sense that a databound control can make changes to the underlying dataset and the dataset does not set the flag (stranger, still - sometimes it does!).


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Private Sub SaveChanges()
        Dim AlertAsSaved As Boolean = False
        Me.ProductBindingSource.EndEdit() 'is this thing working?
 
        Try
 
            'test to prove the dataset has the new value 
            'Dim dt As DataTable = Me.ProductsLocalDataSet.Product
            'Dim dr As DataRow = dt.Rows(0)
            'Dim row0item As String = dr.Item("producttype").ToString
 
'check the HasChanges flag 
            Dim haschgs As Boolean = Me.ProductsLocalDataSet.HasChanges
            If haschgs Then 
 
                Me.TableAdapterManager.UpdateAll(Me.ProductsLocalDataSet)
 
                Me.BindingNavigatorAddNewItem.Visible = True  
                AlertAsSaved = True
 
                Me.ProductTableAdapter.Fill(Me.ProductsLocalDataSet.Product)
 
                bindPictureBox()
            Else
'Should never be here
                MsgBox("No changes to dataset. Nothing saved.", MsgBoxStyle.OkOnly, "Nothing Saved")
            End If
 
        Catch ex As Exception
            Me.BindingNavigatorAddNewItem.Visible = False
            MsgBox(ex.ToString)
        End Try
        If AlertAsSaved Then
            MsgBox("Product successfully saved!", MsgBoxStyle.OkOnly, "Product Saved")
        End If
    End Sub
[+][-]08/07/09 01:23 AM, ID: 25040721Accepted Solution

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About this solution

Zones: .NET Framework 3.x versions, Microsoft Visual Basic.Net, .Net Editors & IDEs
Tags: VB.NET, Winforms, Visual Studio 2008, BindingSource, TableAdapter, DataSet
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Solution Provided By: Deathrace
Participating Experts: 1
Solution Grade: A
 
[+][-]08/08/09 04:34 PM, ID: 25052154Author Comment

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