Grid and LookupEditSettings

Hello
I did a lot of research for the same problem . I found a lot of times the same solution to add the lookUpEditSettings from Xaml . But this doesn't Solve my problem . I have the gridControl Built dynamically from Code behind and i want to create the LookUpEditsettings entirely from code behind . I can do that using this simple code :
            lookUpEditSettings.ItemsSource = listOfItems;
            lookUpEditSettings.StyleSettings = new SearchLookUpEditStyleSettings();
            lookUpEditSettings.AutoPopulateColumns= true;
            lookUpEditSettings.ValueMember = "Key";
            lookUpEditSettings.DisplayMember = "Description";
But what if i want to Hide some of the columns in LookUpEdit from CODE BEHIND . I cant find a way to play with the popUpContentTemplate from Code Behind to Hide for example the KEY Column .
Do you Have any sample Code that can help me ?
thanks

Hi Dimitris,
Thank you for your update. Since it is not a recommended approach to create DataTemplates from code-behavior, I can suggest you utilize the following approach: define your custom DataTemplate for the PopupContentTemplate somewhere in resources; obtain this template from code-behavior, and assign it to your LookUpEdit. Something like this:

C#
lookUpEditSettings.ItemsSource = listOfItems;  
lookUpEditSettings.StyleSettings = new SearchLookUpEditStyleSettings();  
lookUpEditSettings.AutoPopulateColumns= true;  
lookUpEditSettings.ValueMember = "Key";  
lookUpEditSettings.DisplayMember = "Description";  
lookUpEditSettings.PopupContentTemplate = (DataTemplate)myMainWindow.Resources["template"];  

Does this approach meet your requirements?

Hello ! thanks for your fast Response !
Maybe your suggestion can help me but in first place i dont know how to implement it .
To be more precise i added a sample project that will help you understand exactly what i am trying to do. if it is easy for you maybe you can edit the solution to help me out .
What i have in here is a Code behind generated GridControl that binds to a list of customers (or a datatable). This grid updates the layout (byte[]) in a singleton class .
I have a LookUpEdit Control in another window and at the lookUpEdit_PopupOpened i dynamicaly add the column i like to the internal gridControl and i restore the layout from that Singleton Class .
I would like to have the same behaviour in as in the LookUpEdit but in a LookUpEditSettings that is inside a grid Column .
So i would like my user to edit the layout from a GridControl in a page and this layout to be shown in every LookUpEditSettings
of the same type inside other Grids .
So the user will edit The Banks Grid Control in a Window and the GridControl in LookUpEditSettings in Customers , Employees ,Companies GridControls will have the same ,restores from database layout and the columns loaded dynamically .
I hope i am clear now !
Any help, especially having code, will be very helpful!
Thanks in advance

Hi Dimitris,
Thank you for the update. If you wish to use some model for generating grid columns, I suggest you store all properties at your model level. I have modified your sample to show how you can solve this task.

Hello , thanks for the code .
I did it using two different approaches .

1. I used your approach and used exactly this code you gave me :

public class LookUpEditSettingsEx : LookUpEditSettings
    {
        public override DevExpress.Xpf.Editors.IBaseEdit CreateEditor(bool assignEditorSettings, IDefaultEditorViewInfo defaultViewInfo)
        {
            LookUpEdit res = (LookUpEdit)base.CreateEditor(assignEditorSettings, defaultViewInfo);
            res.Tag = Tag;
            return res;
        }
    }
    public class LookUpEditEx : LookUpEdit
    {
        protected override void OnPopupOpened()
        {
            base.OnPopupOpened();
            FlexGridExample gc = (FlexGridExample)GetGridControl();
            if (gc != null)
            {
                gc.Tag = Tag;
                gc.Load();
            }
        }
    }
I also created a Grid that does all the appropriate job in the LOAD method and added the templates you gave me in the app.xaml .
2) I used another approach that is a hybrid between yours and mine . I used this Code :
  public class CustomLookUpEditSettings : LookUpEditSettings
    {
        public override DevExpress.Xpf.Editors.IBaseEdit CreateEditor(bool assignEditorSettings, IDefaultEditorViewInfo defaultViewInfo)
        {
            var _dal = new DAL();
            LookUpEdit res = (LookUpEdit)base.CreateEditor(assignEditorSettings, defaultViewInfo);
            res.PopupOpened += new RoutedEventHandler(lookUpEdit_PopupOpened);
            return res;
        }
        void lookUpEdit_PopupOpened(object sender, RoutedEventArgs e)
        {
            var _dal = new DAL();
            LookUpEdit editor = (LookUpEdit)sender;
            GridControl grid = editor.GetGridControl();
            grid.Columns.Clear();
            var flexGridWithDsForLookUp = new FlexGridWithDatasource(ref grid, true, true);
            var tableScheme = TableSchemesSingleton.TableSchemes.Find(table => table.TableId == 484);
            tableScheme.Height = 400;
            tableScheme.MaxHeight = 600;
            flexGridWithDsForLookUp.GetGridControlWithDs(_dal.GetDatasourceGeneric(tableScheme, tableScheme.TableDb),
                                                        tableScheme, (object senderInternal, FocusedRowChangedEventArgs eInternal) =>
                                                        { });
        }
    }
I used the lookUpEdit_PopupOpened event to access the GridControl in LookUpEditSettings ,access it By Ref and add to it the columns i like and restore the layout i have in Db .
In both cases the Grid in LookUpEditSettings is loaded Correctly , the layout is restored but i cant select a row from this grid and show it as selected in the LookUpEdit . The LookUpEdit works but i am not allowed to select something .When i click a row it gets focused but not selected. The same thing happens and in the demo you sent me .
Does this happen also on your side ?
You think you can help me fix this ? If we make this work , then it will be completed !
Which of the two implementations above look better to you ?
Thanks for the help.

Hi Dimitris,
Thank you for your update. This issue is related to the fact that the GridControls within the custom LookUpEdits have the ItemSource property defined, but the LookUpEdits do not have it. I have fixed this issue.
Let me know if you need further assistance.

Hello,Thanks for the Help .
So if i understood your code the itemsource should be the same for the GridControl in the LookUpEdit and for the LookUpEdit itself. Am i right ?
This is a problem for me . I have my grid filled in using a DataTable and the LookUpEditSettings using a List oF KeyValuePair .
I do that because i dont know how many columns the Grid will have .So I add all the columns in run time , then i add the DataTable as Itemsource . Inside the columns collection of the GRID also are the Bank_id and the Bank_description that i use as Itemsource for the LookUpEdit .
The lookUpEdit itemSource is a list of Bank_id ,Bank_Description pairs . I cant add the same datatable as ItemSource of the LookUpEdit because it should be IEnumerable .
What can i do at this point ?
I know all the columns that the grid will have , I know which columns are going to be ValueMember and DisplayMember in the LookUpEdit but i dont know how to make the itemsources so that the Selection in the LookUpEdit can work .

Hi Dimitris,
Thank you for your clarification. I will try to find a solution that meets your requirements. Please give me some time.
In the meantime, I would appreciate it greatly if you provide me with the modified sample that shows the problem. It will allow me to investigate the problem faster.

Here is my new Sample .
I am doing these actions .

1. I create a grid with people inside . Each one of them has a bestFriend that is a LookUpEdit in the same Table .
2. The grids columns are added dynamically and the grids itemsource is a datatable and not a List because i dont know which columns will come from the database (Which columns user has access to see ).
3. For the best friend Column i add a CustomLookUpEdit and the itemsource for this one is a List of CustomerId ,CustomerName as ValueMember and DisplayMember because I cant have a list with all customer Data as i said above .
4. In the PopUpOpened event as you will see i am clearing the PopUpEdit Grid Columns and add all the Columns that My Logged in user Can see (More than the Two CustomerId,CustomerName columns of the LookUpEdit ItemSource ) .
5. Finally to get these Columns Filled with data i need to set the Grid In LookUpedit Itemsource using the customers Datatable .
   The 5 step seems to destroy the Binding between the LookUpEdit in the Column and the Grid inside . So when you select a line in the LookUpeditGrid Nothing changes in the Column .
   i hope this will help you help me .
   Thanks

Hi Dimitris,
Thank you for providing the sample. As I said before, it is better to store the data source for the LookUpEdit in the TableColumn structure. In this case, we can solve the problem you described by using the CellTemplate instead of the EditSettings. As for the LookUpEdit column, you can set the GridColumn.CellTemplate and put the LookUpEdit into it. With this approach we can bind this LookUpEdit to underlying data. I have modified my sample to demonstrate this approach.
P.S. I have also demonstrated how you can create a DataTemplate from code behind. I hope it will be helpful to you.

Hi Alexander .
I show your sample and i think this aproach will not help me . It still binds a list in lookUpEdit (or lookUpEditSettings ) and binds the same list at the GridControl Inside LookUpEdit (LookUpEditSettings) . Are you sure you understood my case ? If i add a lookUpEdit in my GridColumn.CellTemplate i will still have the same problem. Because i need to bind the lookUpedit with a list of <key ,descpription> and at the GridControl inside the lookUpEdit ( when the popUpIsOpened) with a datatable in order to Show Additional Columns . I thought of adding unbound columns in the grid Control inside the lookUpedit but i think this is going to be late because i will have to populate cell by cell .
Can you please review again the last sample i sent you and Show me a solution in it ?
Sorry about all that questions but i am really stuck and i cant find a workaround .
Thanks for your patience .

Hi Alexander
I Found a Solution for my problem . I fixed this issue.
I will come back later to post my solution for future use, by others .
Thanks for your patience , your time and your help !
PS. I am the same person as Dimitris Aimiliou