EntityInstantFeedbackDataSource Class

A non-visual component that can be used as a data source for the GridControl in Instant Feedback UI Mode. Can be associated with an Entity Framework queryable source.

Namespace: DevExpress.Xpf.Core.ServerMode

Assembly: DevExpress.Xpf.Core.v18.2.dll

Declaration

C#
VB.NET

public class EntityInstantFeedbackDataSource :
    InstantFeedbackDataSourceBase

Public Class EntityInstantFeedbackDataSource
    Inherits InstantFeedbackDataSourceBase

Remarks

The EntityInstantFeedbackDataSource is a non-visual component that is available via the Items Source Wizard. It implements the same functionality introduced by EntityInstantFeedbackSource

Note

The EntityInstantFeedbackDataSource is a read-only data source.

Example

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.

<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>

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;
        }
    }
}

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

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

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.

how-to-implement-crud-operations-using-dxgrid-with-entity-framework-instant-feedback-e3759/CS/MainWindow.xaml#L54

</Grid.RowDefinitions>
<dx:EntityInstantFeedbackDataSource Name="entityInstantSource" KeyExpression="CustomerID" QueryableSource="{Binding Source={StaticResource ResourceKey=NorthwindEntities}, Path=Customers}" />
<dxg:GridControl Grid.Row="0" Name="grid" AutoGenerateColumns="None" ItemsSource="{Binding ElementName=entityInstantSource, Path=Data}">

how-to-activate-the-instant-feedback-mode-for-the-grid-bound-to-an-entity-framework-model-e3160/VB/dxSample-InstanceFeedbackMode/MainWindow.xaml#L10

<Grid>
    <dx:EntityInstantFeedbackDataSource Name="entitySource" KeyExpression="ProductID" />
    <dxg:GridControl Name="grid" ItemsSource="{Binding ElementName=entitySource, Path=Data}">