ActivityToolboxItem.CreateComponentsCore(IDesignerHost) Method

Definition

Namespace:

System.Workflow.ComponentModel.Design

Assembly:

System.Workflow.ComponentModel.dll

Creates an Activity component or an array of Activity components when the toolbox item is invoked.

protected:
 override cli::array <System::ComponentModel::IComponent ^> ^ CreateComponentsCore(System::ComponentModel::Design::IDesignerHost ^ host);

protected override System.ComponentModel.IComponent[] CreateComponentsCore (System.ComponentModel.Design.IDesignerHost host);

override this.CreateComponentsCore : System.ComponentModel.Design.IDesignerHost -> System.ComponentModel.IComponent[]

Protected Overrides Function CreateComponentsCore (host As IDesignerHost) As IComponent()

Parameters

host

IDesignerHost

The IDesignerHost to host the toolbox item.

Returns

IComponent[]

An array of created IComponent objects.

Examples

The following example shows a complete ActivityToolboxItem class for a custom activity. In this example, the CreateComponentsCore method is overridden in order to insert 2 custom activities within a ParallelActivity.

[Serializable]
internal sealed class CustomActivityToolboxItem : ActivityToolboxItem
{
    public CustomActivityToolboxItem(Type type)
        : base(type)
    {
    }

    private CustomActivityToolboxItem(SerializationInfo info, StreamingContext context)
    {
        Deserialize(info, context);
    }

    protected override IComponent[] CreateComponentsCore(IDesignerHost designerHost)
    {
        CompositeActivity parallel = new ParallelActivity();
        parallel.Activities.Add(new CustomActivity());
        parallel.Activities.Add(new CustomActivity());

        return new IComponent[] { parallel };
    }
}

<Serializable()> _
Friend Class CustomActivityToolboxItem
    Inherits ActivityToolboxItem

    Public Sub New(ByVal type As Type)
        MyBase.new(type)
    End Sub

    Private Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        Deserialize(info, context)
    End Sub

    Protected Overrides Function CreateComponentsCore(ByVal designerHost As IDesignerHost) As IComponent()
        Dim parallel As New ParallelActivity()
        parallel.Activities.Add(New CustomActivity())
        parallel.Activities.Add(New CustomActivity())

        Return New IComponent() {parallel}
    End Function
End Class

Remarks

The CreateComponentsCore method returns the component or components that the ActivityToolboxItem creates.