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Activity Class

An abstract base class used to create composite activities from pre-existing Activity objects.

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

public ref class Activity abstract

The Activity type exposes the following members.

Protected methodActivityWhen implemented in a derived class, creates a new instance of the derived class.

Protected propertyCacheIdGets the identifier of the cache that is unique within the scope of the workflow definition.
Protected propertyConstraintsGets a collection of Constraint activities that can be configured to provide validation for the Activity.
Public propertyDisplayNameGets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking.
Public propertyIdGets an identifier that is unique in the scope of the workflow definition.
Protected propertyImplementationGets or sets the delegate that returns an Activity that contains the execution logic.

Protected methodCacheMetadataCreates and validates a description of the activity’s arguments, variables, child activities, and activity delegates.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodShouldSerializeDisplayNameIndicates whether the DisplayName property should be serialized.
Public methodToStringReturns a String that contains the Id and DisplayName of the Activity. (Overrides Object::ToString().)

Activity is the base class in the activity type hierarchy. All other activity types such as CodeActivity, NativeActivity, AsyncCodeActivity, DynamicActivity, and ActivityWithResult derive from this class.

The following example shows a simple implementation of an Activity derived class.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.