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| Class | Description |
|---|
 | Activity | Represents the fundamental building block of workflows. Activity is the base class for all activities. |
| ActivityBind | Binds an activity's property to a property, field, indexer, method, event, or another activity's property. This class cannot be inherited. |
| ActivityChangeAction | Represents a proposed change to a CompositeActivity within a running workflow instance. This class must be inherited. |
| ActivityCollection | Models a strongly typed ICollection of type Activity. |
| ActivityCollectionChangeEventArgs | Represents the information needed by an event handler to perform custom processing whenever the contents of an ActivityCollection changes. |
| ActivityCondition | Represents an abstract class for an expression, which evaluates to a Boolean. This class must be inherited. |
| ActivityExecutionContext | Represents the execution environment of an Activity. This class cannot be inherited. |
| ActivityExecutionContextManager | Allows a CompositeActivity to create and manage execution contexts for its child activities. This class cannot be inherited. |
| ActivityExecutionStatusChangedEventArgs | Holds information relating to the change of execution status event for an Activity. This class cannot be inherited. |
| AddedActivityAction | Represents a proposed addition of an Activity to a CompositeActivity within a running workflow instance. |
| AlternateFlowActivityAttribute | Custom attribute which indicates that the activity supports an alternative flow. This class cannot be inherited. |
| CancellationHandlerActivity | Represents cancellation logic that can be associated with a CompositeActivity. This class cannot be inherited. |
| CompensatableTransactionScopeActivity | Defines a compensatable version of the TransactionScopeActivity activity. This class cannot be inherited. |
| CompensateActivity | Triggers the compensation of a completed child Activity that implements the ICompensatableActivity interface. This class cannot be inherited. |
| CompensationHandlerActivity | Specifies workflow logic that undoes, or compensates for, the successful execution of the associated CompositeActivity. This class cannot be inherited. |
| CompositeActivity | Derivative of Activity that is the base class for all activities that contain other activities. A CompositeActivity is responsible for managing the execution of its child activities. |
| DependencyObject | The base class for all objects that have dependency properties. This class must be inherited. |
| DependencyProperty | A special kind of property that can be defined or attached to a DependencyObject. There are three kinds of dependency properties: instance properties, meta properties, and attached properties. This class cannot be inherited. |
| FaultHandlerActivity | Represents the activity class used to handle an Exception of the type specified by the FaultType property. This class cannot be inherited. |
| FaultHandlersActivity | Represents a CompositeActivity that has an ordered list of child activities of type FaultHandlerActivity. This class cannot be inherited. |
| PersistOnCloseAttribute | Indicates that the current workflow instance must be persisted when the adorned activity completes its execution. This class cannot be inherited. |
| PropertyMetadata | Represents the behavior of a dependency property. |
| QueueEventArgs | Represents the event arguments for a workflow queue-related event. |
| RemovedActivityAction | Represents a proposed removal of an Activity from a CompositeActivity within a running workflow instance. |
| SuspendActivity | Suspends the running workflow instance when executed. This class cannot be inherited. |
| SynchronizationScopeActivity | Represents a section of workflow that requires controlled access to shared variables. If two or more instances of a SynchronizationScopeActivity access the same variables, then the execution of these activities is effectively serialized. This class cannot be inherited. |
| TerminateActivity | Terminates the running workflow instance when an abnormal situation occurs. This class cannot be inherited. |
| ThrowActivity | Models the throwing of an exception. This class cannot be inherited. |
| TransactionScopeActivity | A section of workflow which demarcates a transaction boundary. A new Transaction is started when this Activity begins executing and the transaction commits when the Activity closes successfully. This class cannot be inherited. |
| WorkflowChangeAction | An abstract base class from which all classes that represent proposed changes to a running workflow instance must derive. |
| WorkflowChanges | Represents a set of proposed changes to a running workflow instance. |
| WorkflowParameterBinding | A general-purpose class that represents a binding to a named parameter. This class cannot be inherited. |
| WorkflowParameterBindingCollection | Represents a KeyedCollection<TKey, TItem> of type WorkflowParameterBinding. This class may not be inherited. |
| WorkflowTerminatedException | Represents the Exception that is raised when a workflow is terminated. This class cannot be inherited. |
| WorkflowTransactionOptions | Container for workflow transaction type options. This class cannot be inherited. |
