DevExpress Services passes commands from the ViewModel to controls in the View, which allows you to modify the UI without detaching the application layer.

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DialogService

Allows you to display a dialog box.

Interface

IDialogService

Managed control

• XtraForm
• FlyoutDialog
• RibbonForm

Global registration

C#

MVVMContext.RegisterXtraDialogService();
MVVMContext.RegisterFlyoutDialogService();
MVVMContext.RegisterRibbonDialogService();

VB.NET

MVVMContext.RegisterXtraDialogService()
MVVMContext.RegisterFlyoutDialogService()
MVVMContext.RegisterRibbonDialogService()

DevExpress The MVVM framework automatically calls the RegisterXtraDialogService method.

Local registration

C#

mvvmContext1.RegisterService(DialogService.CreateXtraDialogService(this));
mvvmContext1.RegisterService(DialogService.CreateFlyoutDialogService(this));
mvvmContext1.RegisterService(DialogService.CreateRibbonDialogService(this));
mvvmContext1.RegisterService(DialogService.Create(this, DefaultDialogServiceType.RibbonDialog));

VB.NET

mvvmContext1.RegisterService(DialogService.CreateXtraDialogService(Me))
mvvmContext1.RegisterService(DialogService.CreateFlyoutDialogService(Me))
mvvmContext1.RegisterService(DialogService.CreateRibbonDialogService(Me))
mvvmContext1.RegisterService(DialogService.Create(Me, DefaultDialogServiceType.RibbonDialog))

Create() method

All 'Create...' methods of DialogService need a View with the service. If you pass null instead of View, the framework will try to locate the appropriate window (in most cases, use the activation window).

• Create (iwin32window owner, DefaultDialogServiceType) - use the DefaultDialogServiceType enumerator value to determine the type of service to create.
• CreateXtraDialogService(IWin32Window owner) - create a display skinnable Services for the devaxpress dialog box.
• CreateFlyoutDialogService(IWin32Window owner) - create a display FlyoutDialog Services.
• CreateRibbonDialogService(IWin32Window owner) - create one with embedded RibbonControl s RibbonForm s is displayed as the service of the dialog box, and the dialog box button is displayed as a ribbon item.
• Create (iwin32window owner, string title, func < IDialogForm > factorymethod) - allows you to register a service that manages custom dialog boxes (objects that implement the IDialogForm interface).

C#

DialogService.Create(ownerView1, "A custom dialog", ()=> new CustomDialogClass());

VB.NET

DialogService.Create(ownerView1, "A custom dialog", Function() New CustomDialogClass())

• DialogService Create(IWin32Window owner, string title, IDialogFormFactory factory) - factory class that accepts the creation of custom dialog boxes.

Public service method

• ShowDialog - six extension methods to display dialog boxes with specific appearance and content.

C#

public void FindCustomer() {
if(DialogService.ShowDialog(MessageButton.OKCancel, "Find Customer", findDialogViewModel) == MessageResult.OK) {
// do something
}
}

VB.NET

Public Sub FindCustomer()
If DialogService.ShowDialog(MessageButton.OKCancel, "Find Customer", findDialogViewModel) = MessageResult.OK Then
' do something
End If
End Sub

These overloads allow you to replace the default dialog button with a custom UICommand object. To do this, use the Id or Tag property of the custom command as the MessageResult or DialogResult value.

C#

public void FindCustomer() {
var findDialogViewModel = FindDialogViewModel.Create();
findDialogViewModel.SetParentViewModel(this);
var commands = new List<UICommand>
{
// Button with custom command attached
new UICommand {
Id = "Find",
Caption = "Find",
Command = new DelegateCommand(() =>{
// . . . implement the Find command here
}),
IsDefault = true,
IsCancel = false,
Tag = DialogResult.OK
},
// standard button caption customization
new UICommand {
Caption = "Cancel Find",
Tag = DialogResult.Cancel
}
};
DialogService.ShowDialog(commands, "Find Customer", "FindDialogView", SelectedEntity, findDialogViewModel);
}

VB.NET

Public Sub FindCustomer()
Dim findDialogViewModel = FindDialogViewModel.Create()
findDialogViewModel.SetParentViewModel(Me)
Dim commands = New List(Of UICommand) From {New UICommand With {.Id = "Find", .Caption = "Find", .Command = New DelegateCommand(Sub()
End Sub), .IsDefault = True, .IsCancel = False, .Tag = DialogResult.OK
},
New UICommand With {.Caption = "Cancel Find", .Tag = DialogResult.Cancel}
}
DialogService.ShowDialog(commands, "Find Customer", "FindDialogView", SelectedEntity, findDialogViewModel)
End Sub

• DialogFormStyle - allows you to access the dialog box and modify its appearance settings. For example, the following code shows how to apply a bold font style to a pop-up dialog button.

C#

var service = DialogService.CreateFlyoutDialogService(this);
service.DialogFormStyle = (form) =>
{
FlyoutDialog dialog = form as FlyoutDialog;
dialog.Properties.AppearanceButtons.FontStyleDelta = FontStyle.Bold;
};

VB.NET

Dim service = DialogService.CreateFlyoutDialogService(Me)
service.DialogFormStyle = Sub(form)
Dim dialog As FlyoutDialog = TryCast(form, FlyoutDialog)
dialog.Properties.AppearanceButtons.FontStyleDelta = FontStyle.Bold
End Sub

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