WPF datagrid “EditItem is not allowed for this view” exception

Question

I programmatically add DataGrid:

System.Windows.Controls.DataGrid dataGrid = new System.Windows.Controls.DataGrid();
dataGrid.GridLinesVisibilit         


        

Answer 1

You should not update the Items directly of your DataGrid but rather set the ItemsSource to the collection. DataGrid will generate the view out of the itemsource that implements IEditableCollectionView interface in order to allow the editing. This interface has function EditItems() which let the editing happen.

So in order solve this problem. Create the ObservableCollection property in your VM/Code behind and set the DataGrid ItemsSource to it like

ObservableCollection<Type> MyCollection{get;set;}


Globals_Liker.list_datagrid[tabControl1.SelectedIndex].ItemsSource = MyCollection;

In your constructor you can initialize this collection by newing it. And whenever you want to add item in your DataGrid, just add the item in the Observable collection (MyCollection), it will be shown on grid and will be editable.

Answer 2

I seen this error in 3 cases

case1 : this error shown if double clicking the datagrid then(custom datagrid which contains processed data like analysis)

Simply, Set in Datagrid IsReadOnly="True"

case2 : this error shown after editing the datagrid, must set during RowEditEnding

  (sender as DataGrid).CommitEdit(DataGridEditingUnit.Row);

case3 : this error shown after RowEditEnding event, then must see where the datagrid is reloading the data, it can happen if viewsource or datagrid is already in use and we try to override the data manually

Let me know if any new cases you seen