DataBinding: using a listbox inside a DataGrid

06-27-2008 2:07 PM |

Hi,

  I'm using a DataGrid to display some binded data. In order to let the user edit online the rows of the data grid I have created several CellEditingTemplates, If I use for instance a textbox for editing a column, works fine...

   BUT... what happens if I want to use a listbox in that data template? How can I indicate the ItemsSource of that ListBox ? (the data binded only contains the main entity) Should I create my own entity that contains all the data necessary? (something like a crappy dataset?).

   Thanks in advance

     Braulio

Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 2:20 PM |

you should be able to set the ItemsSource in BeginningEdit event handler

 

Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 2:43 PM |

Thanks for the tip but... how can I retrieve from this event the instance of the listbox that is being shown?

 

Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 2:46 PM |

you can use GetCellContent() method to get the content of the cell, which you will cast to a listbox in your case

Re: Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 3:00 PM |

Thanks... quite near to the solution, but...

 e.Column.GetCellContent(e.Row)

 Returns me the control used for display mode, Is there any other event where the grid returns me the control used in edit mode / template?

 Thanks

Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 3:11 PM |

Hi Lee, 

 It seems that the event to hook is:

PreparingCellForEdit

 This event is fired after the control is loaded.

 Thanks a lot for your help, as soon as I get the full solution working I will post it here (then another dummy like me can perform the binding :-)).

 

 

Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 3:29 PM |

you are  right about the event, PreparingCellForEdit is the right one. if we move the code you wrote before to a handler for this event, it should work

Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 4:30 PM |

Yes, and this event gives some helpfull params

 

private void dgAddTableDlgFieldsGrid_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e)

 

//You can obtain the current row datasource item from the grid

Entities.EntityTableFieldEntry currField = (Entities.EntityTableFieldEntry) e.Row.DataContext;

// You can  obtain the control associated to that cell

ListBox lbEdit = e.Column.GetCellContent(e.Row) as ListBox;

 

Now I have realized, that I have the problem of having ID / Description values... I think I will have to do more manual tweaking to display in the TextBlock the Description but keep the ID internally :-(.

 Thanks for your help

   Braulio 

 

Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

06-27-2008 5:03 PM |

Thanks for the info, for the ListBox now is under control.

 For the textblock (non editing mode) I'm going to hook on the Loaded event for that control and set there the description value (manually search for the description associated with a given ID), maybe is not very elegant.

  Another possiblity could be to add to my entity ID plus description fields (something like Entity: car, color = 1 colorDesc=Red), but I would have to manually update both fields whenever there is a change.

 

Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

03-13-2009 1:22 AM |

Hi,

I am looking for the same problem .... I am populating the data from dbase to the grid in silverlight2.0.

Now my requirement is when i select a row i need to get the updated/modified data for the particular row.... (with a hidden field like in asp.net 'DataKeyField i.e. if i select one row i need to get the EmpId for that particular row where as the empID will ot be visible to the user).

Please let me know the solution.....

Re: Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

04-23-2009 6:21 PM |

I don't see the .GetCellContent method on here anymore...has it been removed?

Re: Re: Re: Re: Re: DataBinding: using a listbox inside a DataGrid

04-27-2009 7:59 PM |

SL 3.0 datagrid. I have created my CellEditingTemplate using a XAML. My GetCellContent(e.Row) gives the GridRow back not the combobox.

Here is some code

  public static DataTemplate returnComboBoxDataTemplate()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<DataTemplate " + DEFAULT_NAMESPACE + " " + WINDOWS_NAMESPACE + " " + APP_NAMESPACE + " " + WINFX_NS + " " + WINFX_BASIC + " " + WINDOWS_DATA_NAMESPACE + " >");
            sb.Append("<Grid>");
            sb.Append("<Grid.Resources>");
            sb.Append("<c:StaticPickListProvider x:Key=\"plp\"></c:StaticPickListProvider>");
            sb.Append("</Grid.Resources>");
            sb.Append("<ComboBox x:Name=\"myCbo\" Loaded=\"ComboBox_Loaded\" >");
            //sb.Append(">");
            sb.Append("</ComboBox>");
            sb.Append("</Grid>");
            sb.Append("</DataTemplate>");
            return (DataTemplate)XamlReader.Load(sb.ToString());
        }

When I do

     void parentGrid_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e)
        {
            DataGrid dg = (DataGrid)sender;
            ComboBox cboItem= (ComboBox)dg.CurrentColumn.GetCellContent(e.Row);
            cboItem.ItemsSource = _pickListItems;
            cboItem.SelectedIndex = 0;

          MessageBox.Show( e.Column.DisplayIndex.ToString());
        }

 

GetCellContent gives me the Grid.Row.

How do I get the combobox?