OleUndoEngine Constructor

Initializes a new instance of OleUndoEngine.

Namespace:  Microsoft.VisualStudio.Shell.Design
Assembly:  Microsoft.VisualStudio.Shell.Design (in Microsoft.VisualStudio.Shell.Design.dll)

Syntax

'宣言
Public Sub New ( _
    provider As IServiceProvider _
)

public OleUndoEngine(
    IServiceProvider provider
)

Parameters

• provider
  Type: System.IServiceProvider
  A instance of the IServiceProvider interface to be used to obtain system resources by the instance of OleUndoEngine.

Exceptions

Exception	Condition
InvalidOperationException	Thrown if IServiceProvider does not supply necessary services.

Remarks

Required Services

These services are required for OleUndoEngine to function. The object will throw an InvalidOperationException object if any of these services do not exist.

IOleUndoManager	Provides the undo stack.
IDesignerSerializationService	Required by the underlying UndoEngineclass to perform undo stack serialization.
IDesignerHost	Required to implement any designer
IComponentChangeService	Provides component change tracking.

Optional Services

These services are not required, but if they are present OleUndoEngine will make use of them.

IVsLinkCapableUndoManager	This interface is queried from IOleUndoManager and if present, OleUndoEnginewill enable linking of undo units across documents.
IVsLinkedUndoTransactionManager	Managed undo units across linked documents.
IVsWindowFrame	Used if needed in handling linked documents to surface the current document if it is blocking another document from being save.

.NET Framework Security

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

See Also

Reference

OleUndoEngine Class

Microsoft.VisualStudio.Shell.Design Namespace

UndoEngine.UndoUnit

OleUndoEngine

OnInterveningUnitBlockingLinkedUndo

AddUndoUnit

CreateUndoUnit

DiscardUndoUnit

Dispose

Other Resources

Supplying Undo Support to Designers