TableView.InitNewRow Event

Allows you to initialize a new row with default values.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v21.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public event InitNewRowEventHandler InitNewRow

VB.NET

Public Event InitNewRow As InitNewRowEventHandler

Event Data

The InitNewRow event's data class is InitNewRowEventArgs. The following properties provide information specific to this event:

Property	Description
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
RowHandle	Gets the handle of the added row.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

The GridControl raises the InitNewRow event in the following cases:

• A user starts to edit the New Item Row.
• A user presses the Append button in the Data Navigator.
• You call the TableView.AddNewRow method / TableViewCommands.AddNewRow command.

This event occurs after the GridControl adds a new record to your data source. Handle the InitNewRow event to initialize fields in the new record. For example, you can assign a unique value to the key field or assign default field values. To do this, use the GridControl.SetCellValue method.

If you want to maintain a clean MVVM pattern and initialize a new row in a View Model, create a command and bind it to the InitNewRowCommand property.

Refer to the following help topic for more information: Add and Remove Rows

Example

This example demonstrates how to initialize cells displayed within the New Item Row with default values.

View Example: How to Initialize the New Item Row with Default Values

XAML

<dxg:GridControl x:Name="grid"
                 AutoGenerateColumns="AddNew">
    <dxg:GridControl.View>
        <dxg:TableView x:Name="view"
                       AutoWidth="True" 
                       NewItemRowPosition="Top" 
                       InitNewRow="OnInitNewRow"
                       ValidateRow="OnValidateRow" 
                       InvalidRowException="OnInvalidRowException" />
    </dxg:GridControl.View>
</dxg:GridControl>

C#

void OnInitNewRow(object sender, InitNewRowEventArgs e) {
    grid.SetCellValue(e.RowHandle, "UnitPrice", 10);
    grid.SetCellValue(e.RowHandle, "CompanyName", "newcompany");
    grid.SetCellValue(e.RowHandle, "Discontinued", false);
}

void OnValidateRow(object sender, GridRowValidationEventArgs e) {
    if(e.RowHandle == GridControl.NewItemRowHandle) {
        e.IsValid = !string.IsNullOrEmpty(((Product)e.Row).ProductName);
        e.Handled = true;
    }
}

void OnInvalidRowException(object sender, InvalidRowExceptionEventArgs e) {
    if(e.RowHandle == GridControl.NewItemRowHandle) {
        e.ErrorText = "Please enter the Product Name.";
        e.WindowCaption = "Input Error";
    }
}

VB.NET

Private Sub OnInitNewRow(ByVal sender As Object, ByVal e As InitNewRowEventArgs)
    Me.grid.SetCellValue(e.RowHandle, "UnitPrice", 10)
    Me.grid.SetCellValue(e.RowHandle, "CompanyName", "newcompany")
    Me.grid.SetCellValue(e.RowHandle, "Discontinued", False)
End Sub

Private Sub OnValidateRow(ByVal sender As Object, ByVal e As GridRowValidationEventArgs)
    If e.RowHandle = DataControlBase.NewItemRowHandle Then
        e.IsValid = Not String.IsNullOrEmpty(CType(e.Row, Product).ProductName)
        e.Handled = True
    End If
End Sub

Private Sub OnInvalidRowException(ByVal sender As Object, ByVal e As InvalidRowExceptionEventArgs)
    If e.RowHandle = DataControlBase.NewItemRowHandle Then
        e.ErrorText = "Please enter the Product Name."
        e.WindowCaption = "Input Error"
    End If
End Sub

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the InitNewRow event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

XAML

wpf-data-grid-initialize-new-item-row-with-default-values/CS/NewItemRow_CodeBehind/MainWindow.xaml#L14

NewItemRowPosition="Top"
InitNewRow="OnInitNewRow"
ValidateRow="OnValidateRow"

C#

how-to-initialize-a-new-row-when-only-the-editor-is-shown-e1817/CS/InitNewRow_Editing/InitNewRowOnEditingBehavior.cs#L11

    AssociatedObject.FocusedRowHandleChanged += OnFocusedRowHandleChanged;
    AssociatedObject.InitNewRow += OnInitNewRow;
}

wpf-data-grid-add-and-remove-rows-in-code/CS/AddRemoveRows/AddRemoveRowBehavior.cs#L36

    base.OnAttached();
    AssociatedObject.InitNewRow += OnInitNewRow;
}

wpf-data-grid-extend-crud-operations/CS/Undo/UndoCRUDOperationsBehavior.cs#L45

    AssociatedObject.DataSourceRefresh += OnRefresh;
    AssociatedObject.InitNewRow += OnNewRowStarted;
}

VB.NET

how-to-initialize-a-new-row-when-only-the-editor-is-shown-e1817/VB/InitNewRow_Editing/InitNewRowOnEditingBehavior.vb#L12

    AddHandler AssociatedObject.FocusedRowHandleChanged, AddressOf OnFocusedRowHandleChanged
    AddHandler AssociatedObject.InitNewRow, AddressOf OnInitNewRow
End Sub

wpf-data-grid-add-and-remove-rows-in-code/VB/AddRemoveRows/AddRemoveRowBehavior.vb#L54

    MyBase.OnAttached()
    AddHandler AssociatedObject.InitNewRow, AddressOf OnInitNewRow
End Sub

wpf-data-grid-extend-crud-operations/VB/Undo/UndoCRUDOperationsBehavior.vb#L71

    AddHandler AssociatedObject.DataSourceRefresh, AddressOf OnRefresh
    AddHandler AssociatedObject.InitNewRow, AddressOf OnNewRowStarted
End Sub