RadGridView RowEditEnded How to get the old values

[Ravi]

Hi,

I am trying to edit the childgrid in the hierarchical grid, the row which  I am editting I want to compare the oldvalues and new values in the RowEditEnded event. How do i achieve this.

I have 3 columns in the childgrid. but in the oldvalues i have only count = 1 or which is the first column.

When i tried e.OldValues["firstcolumn"] = this is giving me the result.
When i tried e..OldValues["SecondColumn"] = this is throwing keynot found exception. likewise for the 3rd column.

Please advice.

Thanks

[Maya]

Hello David,

You may get an old value by using the UniqeName of the corresponding column. For example:

XAML:
<telerik:GridViewDataColumn DataMemberBinding="{Binding Name}"/>

C#:
private void clubsGrid_RowEditEnded(object sender, GridViewRowEditEndedEventArgs e)
        {
            var oldName = e.OldValues["Name"];
        }

 

Greetings,
Maya
the Telerik team

[Ravi]

Thanks for the update.

I have 3 columns in the row. When i try to get the OLD value of the second or third column its throwing an exception , key not found in the collection.

<telerikGridView:GridViewDataColumn Width="125">
                                <telerikGridView:GridViewDataColumn.Header>
                                    <TextBlock Text="Quantity"/>
                                </telerikGridView:GridViewDataColumn.Header>
                                <telerikGridView:GridViewDataColumn.CellTemplate>
                                    <DataTemplate>
                                        <TextBlock Text="{Binding Quantity}" Tag="{Binding}"/>
                                    </DataTemplate>
                                </telerikGridView:GridViewDataColumn.CellTemplate>
                                <telerikGridView:GridViewDataColumn.CellEditTemplate>
                                    <DataTemplate>
                                        <TextBox x:Name="txtQuantity" Text="{Binding Quantity, Mode=TwoWay}"></TextBox>
                                    </DataTemplate>
                                </telerikGridView:GridViewDataColumn.CellEditTemplate>
                            </telerikGridView:GridViewDataColumn>

Above is my second column, but i am not able to do as below
e.OldValues["Quantity"]

Please advice.

Thanks

[Ravi]

I understand by using the DataMemberBinding attribute the column is visible in the OldValues, which is great. but i dont want the filter to appear on the column when i appy DataMemberBinding.

Please advice.

[Maya]

Hello David,

The OldValues can be appropriately used unless CellEditTemplate/CellTemplate are defined for the columns. So, what I would recommend you is to set the DataMemberBinding, remove the templates defined and set the IsFilterable property to "False":

<telerik:GridViewDataColumn DataMemberBinding="{Binding Name}" IsFilterable="False"/>

Thus you will be able to work with the OldValue, but still your column will not be filterable.
 

Greetings,
Maya
the Telerik team

[Jelena]

Hello,

What should we do if we have CellEditTemplate/CellTemplate? Is there a way to retrieve at least the name of the column(s) in which the change has occured?

Thanks,
Jelena

[Maya]

Hi Jelena,

You can find the corresponding cell (through ParentOfType<T> extension method) and get its Column property. 

Kind regards,
Maya
the Telerik team

[Jelena]

Nice. Thank you!

Jelena