Multi select from datagrid

mody_buchbinder — Sun, 17 Dec 2023 18:50:17 GMT

Hello all

This is a pure mvvm question.

I have a datagrid in dockpane. I would like to let the user select many records (using control or shift) so I set the selectionmode to extended (the other option is single).

I set the property in the model view to object so I get something.

When I select one record the property set is activated and I get the selected record.

When I use the shift or control to add more records to the selected the property is not called.

The is working with ListBox where the property is ObservableCollection<MyRecord> but I could not find similar example with DataGrid.

Thanks

Re: Multi select from datagrid

CharlesMacleod — Tue, 19 Dec 2023 01:07:23 GMT

hi mody, this actually proved to be a lot trickier than I expected. Seems Datagrid is not "fully" WPF compliant - it does not have a dependency property for its selected items (the way, say a ListBox or ComboBox has).

https://stackoverflow.com/questions/22868445/select-multiple-items-from-a-datagrid-in-an-mvvm-wpf-project gave some options for a solution. I went with this one:

>>One way to to what you want is to register the SelectionChanged event of the DataGrid to update the property of your ViewModel, that stores the selected items.<<

Sub-classing the Datagrid and adding a dependency property for the selected items is a more sophisticated way to go for sure, and is explained in the stackoverflow post, but using the "SelectionChanged" event on the datagrid is v straighforward and this, at least, should get u pointed in the right direction.

I will get this added as a sample to community samples for a complete solution. It's too much code to paste here in its entirety.

Code behind of the view:

public partial class DataGridDockpaneView : UserControl { public DataGridDockpaneView() { InitializeComponent(); this.Loaded += DataGridDockpaneView_Loaded; } private void DataGridDockpaneView_Loaded(object sender, RoutedEventArgs e) { var dg_vm = this.DataContext as DataGridDockpaneViewModel; dg_vm.SetDataGrid(this.dataGrid); }

and in the dockpane view model:

internal class DataGridDockpaneViewModel : DockPane { private const string _dockPaneID = "DatagridMultiSelect_UI_DataGridDockpane"; private DataGrid _dataGrid = null; private static readonly object _lock = new object(); internal void SetDataGrid(DataGrid dataGrid) { _dataGrid = dataGrid;//wire up the datagrid //From:https://stackoverflow.com/questions/22868445/select-multiple-items-from-a-datagrid-in-an-mvvm-wpf-project _dataGrid.SelectionChanged += (o, e) => { var grid = o as DataGrid; var selected = grid.SelectedItems; lock (_lock) { //"MyRecord" is whatever your custom DataGrid //content items are... var sel_fd = selected.OfType<MyRecord>().ToList(); //TODO - use the selection from the grid... // } }; } ... //Elsewhere: internal class MyRecord { //your custom class }

Re: Multi select from datagrid

Jeff-Reinhart — Fri, 06 Jun 2025 17:11:31 GMT

This has been logged as an issue here: https://github.com/dotnet/wpf/issues/3140. If you agree that multi-select should be out-of-the-box functionality for WPF DataGrids, please consider upvoting this issue!

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