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Activity Class
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Activity Class

.NET Framework 4.6 and 4.5

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

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

[ContentPropertyAttribute("Implementation")]
public abstract class Activity

The Activity type exposes the following members.

  NameDescription
Protected methodActivityInitializes a new instance of the Activity class.
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  NameDescription
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 propertyImplementationVersionGets or sets the version of the implementation used.
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  NameDescription
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 the default hash function. (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.)
Protected methodOnCreateDynamicUpdateMapRaises an event when creating dynamic update map.
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().)
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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: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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