ComponentDesigner.GetService(Type) Method

Definition

Namespace:

System.ComponentModel.Design

Assembly:

System.Windows.Forms.Design.dll

Source:

ComponentDesigner.cs

Attempts to retrieve the specified type of service from the design mode site of the designer's component.

C#

protected virtual object? GetService(Type serviceType);

Parameters

serviceType

Type

The type of service to request.

Returns

Object

An object implementing the requested service, or null if the service cannot be resolved.

Examples

The following code example demonstrates the use of the GetService method to access designer services.

C#

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

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

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

    // Hook the IComponentChangeService events.
    if (this.changeService != null)
    {
        this.changeService.ComponentChanged +=
            new ComponentChangedEventHandler(
            ChangeService_ComponentChanged);

        this.changeService.ComponentAdded +=
            new ComponentEventHandler(
            ChangeService_ComponentAdded);

        this.changeService.ComponentRemoved +=
            new ComponentEventHandler(
            changeService_ComponentRemoved);
    }

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

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

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

    if (this.eventService != null)
    {
        this.eventService.ActiveDesignerChanged +=
            new ActiveDesignerEventHandler(
            eventService_ActiveDesignerChanged);
    }

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

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

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

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

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

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

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

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

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

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

Remarks

The default implementation of this method requests the service from the site of the component.

Applies to

See also

• How to: Access Design-time Services