IsNull class
Defines a workflow activity that checks if a specified object is empty (a null reference (Nothing in Visual Basic)).
Inheritance hierarchy
System.Object
System.Activities.Activity
System.Activities.ActivityWithResult
System.Activities.Activity<Boolean>
Microsoft.SharePoint.WorkflowServices.Activities.IsNull
Namespace: Microsoft.SharePoint.WorkflowServices.Activities
Assembly: Microsoft.SharePoint.WorkflowServices.Activities (in Microsoft.SharePoint.WorkflowServices.Activities.dll)
Syntax
'Declaration
Public NotInheritable Class IsNull _
Inherits Activity(Of Boolean)
'Usage
Dim instance As IsNull
public sealed class IsNull : Activity<bool>
Thread safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.