WinUIMessageBoxService

Jun 07, 2019
2 minutes to read

The WinUIMessageBoxService implements the IMessageBoxService interface and uses the WinUIMessageBox control to display messages.

Note

The message box stretches to fit the window’s width when you use the WinUIMessageBoxService.

Example

You can use the WinUIMessageBoxService instead of the DXMessageBoxService. The following example demonstrates how to use the WinUIMessageBoxService :

MainViewModel.vb
ChildViewModel.vb
ChildView.xaml
MainView.xaml
ChildViewModel.cs
MainViewModel.cs

Imports DevExpress.Mvvm
Imports System.Windows.Input

Namespace Example.ViewModel
    Public Class MainViewModel
        Protected Overridable ReadOnly Property MessageBoxService() As IMessageBoxService
            Get
                Return Nothing
            End Get
        End Property
        Public Sub ShowMessage()
            MessageBoxService.Show("This is MainView!")
        End Sub
    End Class
End Namespace

Imports DevExpress.Mvvm
Imports DevExpress.Mvvm.DataAnnotations

Namespace Example.ViewModel
    Public Class ChildViewModel
        <ServiceProperty(SearchMode:=ServiceSearchMode.PreferParents)> _
        Protected Overridable ReadOnly Property MessageBoxService() As IMessageBoxService
            Get
                Return Nothing
            End Get
        End Property
        Public Sub ShowMessage()
            MessageBoxService.Show("This is ChildView")
        End Sub
    End Class
End Namespace

xaml

<UserControl x:Class="Example.View.ChildView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:ViewModel="clr-namespace:Example.ViewModel"
             xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
             DataContext="{dxmvvm:ViewModelSource ViewModel:ChildViewModel}">
    <Grid>
        <Button Content="ChildView: Show Message" Command="{Binding ShowMessageCommand}"/>
    </Grid>
</UserControl>

xaml

<UserControl x:Class="Example.View.MainView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ViewModel="clr-namespace:Example.ViewModel"
    xmlns:View="clr-namespace:Example.View"
    xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxwui="http://schemas.devexpress.com/winfx/2008/xaml/windowsui"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignHeight="500" d:DesignWidth="600"
    DataContext="{dxmvvm:ViewModelSource ViewModel:MainViewModel}">
    <dxmvvm:Interaction.Behaviors>
        <dxwui:WinUIMessageBoxService/>
    </dxmvvm:Interaction.Behaviors>

    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel Orientation="Vertical">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="MainView: "/>
                <Button Content="Show Message" Command="{Binding ShowMessageCommand}"/>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="ChildView: " />
                <View:ChildView dxmvvm:ViewModelExtensions.ParentViewModel="{Binding DataContext, ElementName=LayoutRoot}"/>
            </StackPanel>
        </StackPanel>
    </Grid>
</UserControl>

csharp

using DevExpress.Mvvm;
using DevExpress.Mvvm.DataAnnotations;

namespace Example.ViewModel {
    public class ChildViewModel {
        [ServiceProperty(SearchMode=ServiceSearchMode.PreferParents)]
        protected virtual IMessageBoxService MessageBoxService { get { return null; } }
        public void ShowMessage() {
            MessageBoxService.Show("This is ChildView");
        }
    }
}

csharp

using DevExpress.Mvvm;
using System.Windows.Input;

namespace Example.ViewModel {
    public class MainViewModel {
        protected virtual IMessageBoxService MessageBoxService { get { return null; } }
        public void ShowMessage() {
            MessageBoxService.Show("This is MainView!");
        }
    }
}