Changing Bindingsource.datasource at Runtime

pandelaras posted on Tuesday, September 30, 2008

I am using csla 3.04 and i am trying to change a a bindingsource.datasource at a windows forms grid. The datasource changes when the user selects a different client(person) from the combobox (a new list is created) . I am also saving a copy of the object, in order to databind itself to a combobox in the grid later on, but that causes no problem. The problem is when i use RebindUI(False, True) the datagridview shows no change although the datasource changed! I have to select the same item on the combobox twice to see a change in the grid! What am i doing wrong? Here is the code

COMBOBOX event

Private Sub Baseis_pelaton_GComboBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Baseis_pelaton_GComboBox.SelectedIndexChanged
        If PROTI_FORA = False Then
            If Baseis_pelaton_GBindingSource.Current IsNot Nothing Then
  'creating new object from combobox choice works ok             
Dim nea_eidh As EIDH_PARAST_ANA_PEL_ERL = EIDH_PARAST_ANA_PEL_ERL.GetEIDH_PARAST_ANA_PEL_ERL(DirectCast(Baseis_pelaton_GBindingSource.Current, Bash_pelaton_G).Id)
'saving it to the form
                m_EIDH_PARAST = nea_eidh.Clone
             'saving old copy to the second bindingsource; this is used to bind itself to a grid's combobox later on
                EIDHPARASTANAPELERLBindingSource.DataSource = nea_eidh
' no saving just refreshing UI
                RebindUI(False, True)
            End If
        End If
    End Sub

REBIND CODE

 Private Sub RebindUI(ByVal saveObject As Boolean, ByVal rebind As Boolean)

        Me.EIDH_PARAST_ANA_PEL_ERLBindingSource.RaiseListChangedEvents = False
      
        Try
            ' unbind the UI
            UnbindBindingSource(Me.EIDH_PARAST_ANA_PEL_ERLBindingSource, saveObject, False)
          

            ' save or cancel changes
            If saveObject Then


                m_EIDH_PARAST.ApplyEdit()
                    Try
                    Dim temp1 As EIDH_PARAST_ANA_PEL_ERL = m_EIDH_PARAST.Clone()
                    m_EIDH_PARAST = temp1.Save()
                Catch ex As Csla.DataPortalException
                    MessageBox.Show(ex.BusinessException.ToString(), _
                      "Error saving", MessageBoxButtons.OK, _
                      MessageBoxIcon.Exclamation)

                Catch ex As Exception
                    MessageBox.Show(ex.ToString(), _
                      "Error Saving", MessageBoxButtons.OK, _
                      MessageBoxIcon.Exclamation)
                End Try

            Else
                m_EIDH_PARAST.CancelEdit()
            End If

            ' rebind UI if requested
            If rebind Then
                BindUI()
            End If

        Finally
            '    ' restore events
            Me.EIDH_PARAST_ANA_PEL_ERLBindingSource.RaiseListChangedEvents = True
         
            If rebind Then
                ' refresh the UI if rebinding
                Me.EIDH_PARAST_ANA_PEL_ERLBindingSource.ResetBindings(False)
            
            End If
        End Try
    End Sub

pandelaras replied on Tuesday, September 30, 2008

traced the error and it seems that the DirectCast(Baseis_pelaton_GBindingSource.Current, Bash_pelaton_G).Id
returns the previous and not the current id at first choice.

SOLUTION

DO NOT USE THIS EVENT :)

Baseis_pelaton_GComboBox.SelectedIndexChanged

use this

Baseis_pelaton_GBindingSource.CurrentItemChanged