NavigationViewModelBase Class

A View Model for Views between which navigation can be organized if they are placed within a NavigationFrame.

Namespace: DevExpress.Mvvm

Assembly: DevExpress.Mvvm.v20.1.dll

Declaration

public abstract class NavigationViewModelBase :
    ViewModelBase,
    ISupportNavigation,
    ISupportParameter
Public MustInherit Class NavigationViewModelBase
    Inherits ViewModelBase
    Implements ISupportNavigation,
               ISupportParameter

Remarks

The NavigationViewModelBase class implements the ISupportNavigation interface, which adds the OnNavigatedTo and OnNavigatedFrom methods to the class. When deriving your ViewModel from the NavigationViewModelBase class, you can override these methods to perform actions when a View is activated or deactivated during navigation.

Examples

The FrameNavigationService provides methods to navigate between Views within a NavigationFrame. This example shows how to use this service.In this example, the MainWindow contains a NavigationFrame, which shows a HomeView at startup. The HomeView contains a Tile, which invokes a command to navigate to a DetailView when clicked. The DetailView contains the Back button for backward navigation.

<UserControl x:Class="DXSample.View.MainView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:dxwui="http://schemas.devexpress.com/winfx/2008/xaml/windowsui"
    xmlns:dxwuin="http://schemas.devexpress.com/winfx/2008/xaml/windowsui/navigation"
    xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm" 
    xmlns:ViewModel="clr-namespace:DXSample.ViewModel" 
    mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" 
    DataContext="{dxmvvm:ViewModelSource Type={x:Type ViewModel:MainViewModel}}">
    <Grid>
        <dxwui:NavigationFrame AnimationType="SlideHorizontal" NavigationCacheMode="Required">
            <dxmvvm:Interaction.Triggers>
                <dxmvvm:EventToCommand EventName="Loaded" Command="{Binding OnViewLoadedCommand}" />
            </dxmvvm:Interaction.Triggers>
            <dxmvvm:Interaction.Behaviors>
                <dxwuin:FrameNavigationService />
            </dxmvvm:Interaction.Behaviors>
        </dxwui:NavigationFrame>
    </Grid>
</UserControl>

Inheritance

Object
BindableBase
ViewModelBase
NavigationViewModelBase
See Also