ComponentDesigner.GetService(Type) Metod

protected:
 virtual System::Object ^ GetService(Type ^ serviceType);

protected virtual object GetService(Type serviceType);

protected virtual object? GetService(Type serviceType);

abstract member GetService : Type -> obj
override this.GetService : Type -> obj

Protected Overridable Function GetService (serviceType As Type) As Object

Parametrar

Returer

Ett objekt som implementerar den begärda tjänsten eller null om tjänsten inte kan matchas.

Exempel

I följande kodexempel visas hur metoden används GetService för att komma åt designertjänster.

// This utility method connects the designer to various
// services it will use. 
void InitializeServices()
{
    // Acquire a reference to DesignerActionService.
    actionService =
        GetService(typeof(DesignerActionService))
        as DesignerActionService;

    // Acquire a reference to DesignerActionUIService.
    actionUiService =
        GetService(typeof(DesignerActionUIService))
        as DesignerActionUIService;

    // Acquire a reference to IComponentChangeService.
    changeService =
        GetService(typeof(IComponentChangeService))
        as IComponentChangeService;

    // Hook the IComponentChangeService events.
    if (changeService != null)
    {
        changeService.ComponentChanged +=

            ChangeService_ComponentChanged;

        changeService.ComponentAdded +=

            ChangeService_ComponentAdded;

        changeService.ComponentRemoved +=

            changeService_ComponentRemoved;
    }

    // Acquire a reference to ISelectionService.
    selectionService =
        GetService(typeof(ISelectionService))
        as ISelectionService;

    // Hook the SelectionChanged event.
    if (selectionService != null)
    {
        selectionService.SelectionChanged +=
             selectionService_SelectionChanged;
    }

    // Acquire a reference to IDesignerEventService.
    eventService =
        GetService(typeof(IDesignerEventService))
        as IDesignerEventService;

    if (eventService != null)
    {
        eventService.ActiveDesignerChanged +=

            eventService_ActiveDesignerChanged;
    }

    // Acquire a reference to IDesignerHost.
    host =
        GetService(typeof(IDesignerHost))
        as IDesignerHost;

    // Acquire a reference to IDesignerOptionService.
    optionService =
        GetService(typeof(IDesignerOptionService))
        as IDesignerOptionService;

    // Acquire a reference to IEventBindingService.
    eventBindingService =
        GetService(typeof(IEventBindingService))
        as IEventBindingService;

    // Acquire a reference to IExtenderListService.
    listService =
        GetService(typeof(IExtenderListService))
        as IExtenderListService;

    // Acquire a reference to IReferenceService.
    referenceService =
        GetService(typeof(IReferenceService))
        as IReferenceService;

    // Acquire a reference to ITypeResolutionService.
    typeResService =
        GetService(typeof(ITypeResolutionService))
        as ITypeResolutionService;

    // Acquire a reference to IComponentDiscoveryService.
    componentDiscoveryService =
        GetService(typeof(IComponentDiscoveryService))
        as IComponentDiscoveryService;

    // Acquire a reference to IToolboxService.
    toolboxService =
        GetService(typeof(IToolboxService))
        as IToolboxService;

    // Acquire a reference to UndoEngine.
    undoEng =
        GetService(typeof(UndoEngine))
        as UndoEngine;

    if (undoEng != null)
    {
        _ = MessageBox.Show("UndoEngine");
    }
}

' This utility method connects the designer to various
' services it will use. 
Private Sub InitializeServices()

    ' Acquire a reference to DesignerActionService.
    Me.actionService = GetService(GetType(DesignerActionService))

    ' Acquire a reference to DesignerActionUIService.
    Me.actionUiService = GetService(GetType(DesignerActionUIService))

    ' Acquire a reference to IComponentChangeService.
    Me.changeService = GetService(GetType(IComponentChangeService))

    ' Hook the IComponentChangeService events.
    If (Me.changeService IsNot Nothing) Then
        AddHandler Me.changeService.ComponentChanged, AddressOf ChangeService_ComponentChanged

        AddHandler Me.changeService.ComponentAdded, AddressOf ChangeService_ComponentAdded

        AddHandler Me.changeService.ComponentRemoved, AddressOf changeService_ComponentRemoved
    End If

    ' Acquire a reference to ISelectionService.
    Me.selectionService = GetService(GetType(ISelectionService))

    ' Hook the SelectionChanged event.
    If (Me.selectionService IsNot Nothing) Then
        AddHandler Me.selectionService.SelectionChanged, AddressOf selectionService_SelectionChanged
    End If

    ' Acquire a reference to IDesignerEventService.
    Me.eventService = GetService(GetType(IDesignerEventService))

    If (Me.eventService IsNot Nothing) Then
        AddHandler Me.eventService.ActiveDesignerChanged, AddressOf eventService_ActiveDesignerChanged
    End If

    ' Acquire a reference to IDesignerHost.
    Me.host = GetService(GetType(IDesignerHost))

    ' Acquire a reference to IDesignerOptionService.
    Me.optionService = GetService(GetType(IDesignerOptionService))

    ' Acquire a reference to IEventBindingService.
    Me.eventBindingService = GetService(GetType(IEventBindingService))

    ' Acquire a reference to IExtenderListService.
    Me.listService = GetService(GetType(IExtenderListService))

    ' Acquire a reference to IReferenceService.
    Me.referenceService = GetService(GetType(IReferenceService))

    ' Acquire a reference to ITypeResolutionService.
    Me.typeResService = GetService(GetType(ITypeResolutionService))

    ' Acquire a reference to IComponentDiscoveryService.
    Me.componentDiscoveryService = GetService(GetType(IComponentDiscoveryService))

    ' Acquire a reference to IToolboxService.
    Me.toolboxService = GetService(GetType(IToolboxService))

    ' Acquire a reference to UndoEngine.
    Me.undoEng = GetService(GetType(UndoEngine))

    If (Me.undoEng IsNot Nothing) Then
        MessageBox.Show("UndoEngine")
    End If
End Sub

Kommentarer

Standardimplementeringen av den här metoden begär tjänsten från komponentens plats.

Se även

• Så här gör du: Få åtkomst till designtidstjänster