How to: Activate the Instant Feedback Mode for the Grid Bound to the Entity Framework 4.0 Classes

• Aug 01, 2019

This example shows how to implement the Instant Feedback UI Mode (asynchronous data loading) for the grid bound to the Entity Framework 4.0 Classes. To activate this feature, our specially designed data source (LinqInstantFeedbackSource) is used.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-activate-the-instant-feedback-mode-for-the-grid-bound-to-an-entity-framework-model-e3160.

MainWindow.xaml

<Window x:Class="dxSample_InstanceFeedbackMode.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
        dx:ThemeManager.ThemeName="Office2007Black">
    <Grid>
        <dx:EntityInstantFeedbackDataSource Name="entitySource" KeyExpression="ProductID" />
        <dxg:GridControl Name="grid" ItemsSource="{Binding ElementName=entitySource, Path=Data}">
            <dxg:GridControl.Columns>
                <dxg:GridColumn FieldName="ProductName"/>
                <dxg:GridColumn FieldName="UnitPrice">
                    <dxg:GridColumn.EditSettings>
                        <dxe:SpinEditSettings MaskType="Numeric" Mask="c2"
                                              MaskUseAsDisplayFormat="True" />
                    </dxg:GridColumn.EditSettings>
                </dxg:GridColumn>
                <dxg:GridColumn FieldName="UnitsInStock"/>
                <dxg:GridColumn FieldName="UnitsOnOrder"/>
                <dxg:GridColumn FieldName="ReorderLevel"/>
                <dxg:GridColumn FieldName="Discontinued"/>
            </dxg:GridControl.Columns>
            <dxg:GridControl.View>
                <dxg:TableView Name="tableView1" AutoWidth="True"
                               RowAnimationKind="Opacity" />
            </dxg:GridControl.View>
        </dxg:GridControl>
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Windows;
using DevExpress.Data.Linq;
using DevExpress.Xpf.Grid;

namespace dxSample_InstanceFeedbackMode {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        NorthwindEntities dataContext;
        public MainWindow() {
            InitializeComponent();
            dataContext = new NorthwindEntities();
            entitySource.QueryableSource = dataContext.Products;
        }
    }
}

MainWindow.xaml.vb

Imports Microsoft.VisualBasic
Imports System.Windows
Imports DevExpress.Data.Linq
Imports DevExpress.Xpf.Grid

Namespace dxSample_InstanceFeedbackMode
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window
        Private dataContext As NorthwindEntities
        Public Sub New()
            InitializeComponent()
            dataContext = New NorthwindEntities()
            entitySource.QueryableSource = dataContext.Products
        End Sub
    End Class
End Namespace