Can't add row to DataGridView with BindingList

Question

I'm writing C# WPF application. I'm new to it and tried to load a List to the DataGrid and failed. Then I added a WinForm to my WPF solution with DataGridView. when I loaded the list to the DataGridView.DataSource I didn't had the '*' row to add new row even though the AllowUserToAddRows property is True, I converted the List to BindingList and still there's now new row. I've searched everywhere but everyone says that the BindingList solved them the problem. Is it because its a WinForm in WPF application? How do i fix that?

Yes Mohammad, the ReadOnly is false, I'll check OmegaMan answer and if it doesn't work i'll post the code. Thanks for now. — Erez Konforti

ΩmegaMan ΩmegaMan · Accepted Answer · 2015-08-31T15:53:37

Focus on using WPF, the winforms plugin works, but one finds due to the idiosyncrasis of the process it is truly not optimal.

Here is a basic example I have created which binds to a common list array. You can use an ObservableCollection or a simple generic list. In WPF one primarily defines the look/feel in xaml and then binds data to that. The ItemsSource is standard way of getting items into the datagrid to be shown.

Window.Resources>
    <model:People x:Key="People">
        <model:Person First="Joe"   Last="Smith"   Phone="303-555 5555" />
        <model:Person First="Mary"  Last="Johnson" Phone="720-555 5555" />
        <model:Person First="Frank" Last="Wright"  Phone="202-555 5555" />
    </model:People>
</Window.Resources>
<DataGrid AutoGenerateColumns="False"
          ItemsSource="{StaticResource People}">
    <DataGrid.Columns>
        <DataGridTextColumn Header="First" Binding="{Binding First}" />
        <DataGridTextColumn Header="The Name" Binding="{Binding Last}" />
        <DataGridTextColumn Header="Phone Number" Binding="{Binding Phone}"/>
    </DataGrid.Columns>
    <DataGrid.RowDetailsTemplate>
       <DataTemplate>
           <TextBlock Text="{Binding Phone}" />
       </DataTemplate>
    </DataGrid.RowDetailsTemplate>
</DataGrid>

The result is the list with a rows template which opens upon click:

Now most likely you will not use a Static Resource defined in Xaml to bind to just as I have shown, instead one places oa VM (ViewModel) class instance which implements INotifyPropertyChanged and creates a People property.

The VM can be accessed from the page's data context after it is most likely instantiated in code behind such as

public MyPage()
{
     InitializeComponent();
     DataContext = new MyPageViewModel(); // Contains logic for the 'People' Property of a list of people.

}

}

Then one changes the binding in my example above to bind to the page's datacontext which is inheirted from the page because nothing was set for the datagrid control.

<DataGrid AutoGenerateColumns="False"
          ItemsSource="{Binding People}">

For a complete MVVM example see my blog Xaml: ViewModel Main Page Instantiation and Loading Strategy for Easier Binding

Can't add row to DataGridView with BindingList

2 Answers