CODEWITHSUNDEEP
c#wpfdatagrid
Rover
Rover

Reputation: 2240

How to programmatically create object for new row in DataGrid?

I have ObservableCollection<IInterface> which is binded to DataGrid. IInterface is interface.

I want to add new row clearly for user (without add button). I've added CanUserAddRows="true" but it works only when dataGrid is binded on ObservableCollection<MyClass>.

How can I programmatically create new object for new row?

Upvotes: 1

Views: 1536

Answers (2)

grover
grover

Reputation: 2295

I've recently had the same issue. I've posted a solution in my blog: Enable inline adding of records for view models with non-default constructors/interfaces

It basically involves creating a custom ListCollectionView (can be done similarly for the others) and binding the grid to that view. The custom view has a factory method used to create the rows as the default implementation in ListCollectionView doesn't support adding rows for interfaces or classes which do not have a default constructor.

Note that even if you do not use a CollectionView in your MVVM view model, but a regular list or an IBindingList, WPF will create a specific collection view for you. See more details WPF’s CollectionViewSource

Upvotes: 1

Random Dev
Random Dev

Reputation: 52300

To answer your question: "programmatically" you can add by just adding/inserting an object into your ObservableCollection - but I think you want the automatic-adding feature you describe earlier.

The problem is that, the framework cannot know how to create an instance of your Interface - it only knows how to create types with default-constructors. So you have to change your ObserveableCollection using a concrete type or you cannot use the automatic feature and have to add the object in code-behind.

Upvotes: 2

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