Hi,

i have a Grid with following settings:

...

      this.FieldLayoutSettings.SupportDataErrorInfo = SupportDataErrorInfo.None;
      this.FieldLayoutSettings.DataErrorDisplayMode = DataErrorDisplayMode.None;

...

Why the function RefreshDataErrorInfo is called?

This function is very expensive!

40,64% System.Collections.ObjectModel.ObservableCollection<T>.OnCollectionChanged... - 31237* ms - 149 calls
  40,64% ReceiveWeakEvent - 31236* ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.ReceiveWeakEvent(Type, Object, EventArgs)   (from System.Windows.IWeakEventListener)
    40,64% OnChangeNotification - 31236* ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.OnChangeNotification(Object, Object, Boolean)
      40,64% ProcessChangeNotification - 31235* ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.ProcessChangeNotification(Object, Object)
        40,64% OnSourceCollectionChanged - 31235* ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.OnSourceCollectionChanged(Object, NotifyCollectionChangedEventArgs)
          40,64% OnSourceCollectionReset - 31235* ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.OnSourceCollectionReset()
            21,32% RefreshCellValues - 16389* ms - 2098 calls - Infragistics.Windows.DataPresenter.DataRecord.RefreshCellValues(Boolean, Boolean, Boolean)
              19,69% RefreshDataErrorInfo - 15138* ms - 2098 calls - Infragistics.Windows.DataPresenter.DataRecord.RefreshDataErrorInfo(Field, Boolean)
                19,27% RefreshDataErrorInfo - 14815* ms - 493115 calls - Infragistics.Windows.DataPresenter.DataRecord.RefreshDataErrorInfo(Field, Boolean)
                  18,80% FromRecordAndField - 14448* ms - 493115 calls - Infragistics.Windows.DataPresenter.CellValuePresenter.FromRecordAndField(DataRecord, Field)
                    16,98% GetDescendantFromType - 13054* ms - 493115 calls - Infragistics.Windows.Utilities.GetDescendantFromType(DependencyObject, Type, Boolean)
                      16,93% GetDescendantFromType<T> - 13012* ms - 493115 calls - Infragistics.Windows.Utilities.GetDescendantFromType<T>(DependencyObject, Type, Boolean, DependencyObjectSearchCallback<T>, Type [])
                        15,07% GetDescendantFromType<T> - 11581* ms - 493115 calls - Infragistics.Windows.Utilities.GetDescendantFromType<T>(DependencyObject, Type, Boolean, DependencyObjectSearchCallback<T>, Type [])
                          13,24% GetDescendantFromType<T> - 10175* ms - 493115 calls - Infragistics.Windows.Utilities.GetDescendantFromType<T>(DependencyObject, Type, Boolean, DependencyObjectSearchCallback<T>, Type [])
                            6,48% GetChild - 4984* ms - 5917381 calls - System.Windows.Media.VisualTreeHelper.GetChild(DependencyObject, Int32)
                            3,34% GetDescendantFromType<T> - 2566 ms - 2958692 calls - Infragistics.Windows.Utilities.GetDescendantFromType<T>(DependencyObject, Type, Boolean, DependencyObjectSearchCallback<T>, Type [])
                            1,73% IsAssignableFrom - 1333 ms - 2958690 calls - System.Type.IsAssignableFrom(Type)
                            0,67% GetChildrenCount - 517 ms - 493115 calls - System.Windows.Media.VisualTreeHelper.GetChildrenCount(DependencyObject)
                          0,87% GetChild - 665 ms - 986230 calls - System.Windows.Media.VisualTreeHelper.GetChild(DependencyObject, Int32)
                          0,44% GetChildrenCount - 341 ms - 493115 calls - System.Windows.Media.VisualTreeHelper.GetChildrenCount(DependencyObject)
                          0,29% IsAssignableFrom - 221 ms - 493115 calls - System.Type.IsAssignableFrom(Type)
                        0,83% GetChild - 642 ms - 986230 calls - System.Windows.Media.VisualTreeHelper.GetChild(DependencyObject, Int32)
                        0,43% GetChildrenCount - 331 ms - 493115 calls - System.Windows.Media.VisualTreeHelper.GetChildrenCount(DependencyObject)
                        0,32% IsAssignableFrom - 249 ms - 493115 calls - System.Type.IsAssignableFrom(Type)
                    1,21% GetRecordContentSite - 932 ms - 493115 calls - Infragistics.Windows.DataPresenter.RecordPresenter.GetRecordContentSite()
                    0,25% GetCellValuePresenter - 193 ms - 493116 calls - Infragistics.Windows.DataPresenter.VirtualizingDataRecordCellPanel.GetCellValuePresenter(Field)
                    0,15% get_AssociatedRecordPresenter - 113 ms - 493115 calls - Infragistics.Windows.DataPresenter.Record.get_AssociatedRecordPresenter()
                    0,02% IsCellAllocated - 19 ms - 493115 calls - Infragistics.Windows.DataPresenter.DataRecord.IsCellAllocated(Field)
                  0,34% UpdateDataError - 264 ms - 16788 calls - Infragistics.Windows.DataPresenter.CellValuePresenter.UpdateDataError()
                  0,02% get_IsUnbound - 18 ms - 493115 calls - Infragistics.Windows.DataPresenter.Field.get_IsUnbound()
                0,25% RaisePropertyChangedEvent - 193 ms - 4196 calls - Infragistics.Windows.Helpers.PropertyChangeNotifier.RaisePropertyChangedEvent(String)
                0,03% MoveNext - 22 ms - 495214 calls - System.Collections.Generic.List<T>.Enumerator.MoveNext()
                0,03% UpdateDataError - 20 ms - 2098 calls - Infragistics.Windows.DataPresenter.DataRecordPresenter.UpdateDataError()
                0,02% get_Current - 18 ms - 493115 calls - System.Collections.Generic.List<T>.Enumerator.get_Current()
              1,42% SyncValueWithCellValue - 1088 ms - 16784 calls - Infragistics.Windows.DataPresenter.CellValuePresenter.SyncValueWithCellValue(DataRecord, Field)
              0,09% DataValueChangedHelper - 69 ms - 16784 calls - Infragistics.Windows.DataPresenter.DataRecord.DataValueChangedHelper(Field)
              0,03% MoveNext - 20 ms - 495128 calls - System.Collections.Generic.List<T>.Enumerator.MoveNext()
              0,02% get_Current - 18 ms - 493030 calls - System.Collections.Generic.List<T>.Enumerator.get_Current()
            12,13% VerifySort - 9325 ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.VerifySort()
            2,45% EndUpdate - 1882 ms - 149 calls - Infragistics.Windows.DataPresenter.RecordManager.EndUpdate(Boolean)
            1,75% GetItem - 1346 ms - 2254405 calls - Infragistics.Windows.DataPresenter.UnsortedRecordSparseArray.GetItem(Int32, Boolean)
            0,35% MoveNext - 267 ms - 2254554 calls - Infragistics.Windows.Helpers.SparseArray.NonNullEnumerator.MoveNext()   (from System.Collections.IEnumerator)
            0,32% get_Current - 244 ms - 2254405 calls - Infragistics.Windows.Helpers.SparseArray.NonNullEnumerator.get_Current()   (from System.Collections.IEnumerator)
            0,29% RaisePropertyChangedEvent - 221 ms - 600 calls - Infragistics.Windows.Helpers.PropertyChangeNotifier.RaisePropertyChangedEvent(String)
            0,15% GetObjectForComparison - 112 ms - 2254405 calls - Infragistics.Windows.Internal.DataBindingUtilities.GetObjectForComparison(Object)
            0,14% get_AssociatedRecordPresenter - 108 ms - 2256503 calls - Infragistics.Windows.DataPresenter.Record.get_AssociatedRecordPresenter()
            0,13% MoveNext - 96 ms - 2254554 calls - System.Collections.Generic.List<T>.Enumerator.MoveNext()
            0,12% OnDataChanged - 89 ms - 299 calls - Infragistics.Windows.DataPresenter.RecordManager.OnDataChanged(DataChangeType, DataRecord, Field)
            0,11% get_Current - 86 ms - 2254405 calls - System.Collections.Generic.List<T>.Enumerator.get_Current()   (from System.Collections.IEnumerator)

best regards