INotifyPropertyChanged or INotifyCollectionChanged with DataTable?

问题

Hi i am having some troube with DataTables. So What i need is to detect whenever i change any cell in the DataGrid of the DataTable that is binded.

How to do it? With INotifyPropertyChanged or with INotifyCollectionChanged?

Note: I am trying with INotifyPropertyChanged but it only detects when i set some value in the DataTable, and never when i change any value of any cell in the DataGrid, i already have tried OneWay and TwoWay but nothing happens.

Thanks in advance!

回答1:

The datagrid would be bound to a list of objects. If you want the grid to update when individual object properties change, than each contained object must implement the INotifyPropertyChanged interface.

The INotifyCollectionChanged is an interface that the collection should implement, and are for notifications of addition and removal events.

See the section "How to implement collections" on this page.

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Here's a way to approach your problem:

• Create a new class that exposes the properties currently held in each DataRow. On this class implement INotifyPropertyChanged.
• Instead of a DataTable, use an ObservableCollection<T> or your new class.

ObservableCollection already implements INotifyCollectionChanged, so this saves you the effort of implementing it yourself.

回答2:

if you set the itemssource of your datagrid to a datatable then wpf create a IBindingListView wich is bound to the datagrid.

what you can do now is edit,add and delete items to your datatable via datagrid. if you wanna know when a cell in your datatable is changed you can subscribe to DataTable.ColumnChanged event.

why do you want do know when a cell is changed?

来源：https://stackoverflow.com/questions/5798936/inotifypropertychanged-or-inotifycollectionchanged-with-datatable