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IModalService Interface

Enables notification to a host application that a modal dialog is displayed.

Namespace:  System.Activities.Presentation
Assembly:  System.Activities.Presentation (in System.Activities.Presentation.dll)

public interface IModalService

The IModalService type exposes the following members.

  NameDescription
Public methodSetModalStateNotifies the host application that a modal dialog is being displayed.
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Some applications that host designers need to be notified when a modal dialog box has been invoked. Visual Studio is an example of such a host. The IModalService interface provides an interface to communicate the current modal status.

The Windows Workflow Designer calls the SetModalState method. When the isModal parameter is set to true, the host is notified that a modal dialog is displayed.

This is an optional service. If a host application does not care about the modal status, you need not use the service.

In the current implementation, if a Windows Presentation Foundation (WPF) message box (which is a modal dialog) is invoked, the SetModalStateis not called. If the host application requires this information, another workaround must be created.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4
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