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V24.1

UIObjectService Class

Allows you to write View Model code that can access UI objects in a View and does not reference the object’s type.

Namespace: DevExpress.Mvvm.UI

Assembly: DevExpress.Xpf.Core.v24.1.dll

NuGet Package: DevExpress.Wpf.Core

Declaration

[TargetType(typeof(FrameworkElement))]
public class UIObjectService :
    ServiceBase,
    IUIObjectService

Remarks

Run Demo: UIObjectService

The UIObjectService implements the IUIObjectService interface that has the following declaration:

public interface IUIObjectService {
    dynamic Object { get; }
}

The Object property returns the associated object of the dynamic type to not reference the object’s real type in the View Model and maintain a clean MVVM pattern.

Example

The following code sample uses the UIObjectService to access the GridControl and TableView objects:

<dxg:GridControl ItemsSource="{Binding Source}" AutoGenerateColumns="AddNew">
    <dxmvvm:Interaction.Behaviors>
        <dxmvvm:UIObjectService x:Name="gridControlService"/>
    </dxmvvm:Interaction.Behaviors>
    <dxg:GridControl.View>
        <dxg:TableView ...>
            <dxmvvm:Interaction.Behaviors>
                <dxmvvm:UIObjectService x:Name="tableViewService"/>
            </dxmvvm:Interaction.Behaviors>
        </dxg:TableView>
    </dxg:GridControl.View>
</dxg:GridControl>
<Button Content="Export to PDF" Command="{Binding ExportToPdfCommand}"/>
<Button Content="Filter" Command="{Binding ApplyFilterCommand}"/>
using DevExpress.Mvvm;
using DevExpress.Mvvm.DataAnnotations;

public class MainViewModel : ViewModelBase {
    // ...
    public IUIObjectService GridService { get { return GetService<IUIObjectService>("gridControlService"); } }
    public IUIObjectService TableViewService { get { return GetService<IUIObjectService>("tableViewService"); } }

    [Command]
    public void ApplyFilter() {
        GridService.Object.FilterString = "[Quantity] >= 50";
    }
    [Command]
    public void ExportToPdf() {
        TableViewService.Object.ExportToPdf(@"C:\Work\Documents\GridExport.pdf");
    }
}

Refer to the following help topic for more information: UIObjectService.

Inheritance

Show 11 items
Object
DispatcherObject
DependencyObject
Freezable
Animatable
DevExpress.Mvvm.UI.Interactivity.AttachableObjectBase
DevExpress.Mvvm.UI.Interactivity.Behavior
DevExpress.Mvvm.UI.Interactivity.Behavior<FrameworkElement>
DevExpress.Mvvm.UI.ServiceBaseGeneric<FrameworkElement>
ServiceBase
UIObjectService
See Also