Activity<TResult> Class
An abstract base class used to create composite activities from pre-existing Activity objects, which specifies a result type using the activity’s type specifier.
Assembly: System.Activities (in System.Activities.dll)
System.Activities::Activity
System.Activities::ActivityWithResult
System.Activities::Activity<TResult>
System.Activities::AsyncCodeActivity<TResult>
System.Activities::CodeActivity<TResult>
System.Activities::DynamicActivity<TResult>
System.Activities.Expressions::AndAlso
System.Activities.Expressions::OrElse
System.Activities::NativeActivity<TResult>
| Name | Description | |
|---|---|---|
![]() | Activity<TResult>() | When implemented in a derived class, creates a new instance of the derived class. |
| Name | Description | |
|---|---|---|
![]() | CacheId | Gets the identifier of the cache that is unique within the scope of the workflow definition.(Inherited from Activity.) |
![]() | Constraints | Gets a collection of Constraint activities that can be configured to provide validation for the Activity.(Inherited from Activity.) |
![]() | DisplayName | Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking.(Inherited from Activity.) |
![]() | Id | Gets an identifier that is unique in the scope of the workflow definition.(Inherited from Activity.) |
![]() | Implementation | (Inherited from Activity.) |
![]() | ImplementationVersion | Gets or sets the version of the implementation used.(Inherited from Activity.) |
![]() | Result | Gets or sets the result argument for the Activity<TResult>. |
![]() | ResultType | When implemented in a derived class, gets the type of an activity OutArgument.(Inherited from ActivityWithResult.) |
| Name | Description | |
|---|---|---|
![]() | CacheMetadata(ActivityMetadata) | Creates and validates a description of the activity’s arguments, variables, child activities, and activity delegates.(Inherited from Activity.) |
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() ![]() | FromValue(TResult) | Returns a Activity<TResult> expression that evaluates to the given value. |
![]() ![]() | FromVariable(Variable^) | Returns a Activity<TResult> expression that evaluates to the given Variable. |
![]() ![]() | FromVariable(Variable<TResult>^) | Returns a Activity<TResult> expression that evaluates to the given Variable<T>. |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | OnCreateDynamicUpdateMap(UpdateMapMetadata^, Activity^) | Raises an event when creating dynamic update map.(Inherited from Activity.) |
![]() | ShouldSerializeDisplayName() | Indicates whether the DisplayName property should be serialized.(Inherited from Activity.) |
![]() | ToString() | Returns a String that contains the Id and DisplayName of the Activity.(Inherited from Activity.) |
| Name | Description | |
|---|---|---|
![]() ![]() | Implicit(TResult to Activity<TResult>^) | Returns a Activity<TResult> expression that evaluates to the given value. |
![]() ![]() | Implicit(Variable^ to Activity<TResult>^) | Returns a Activity<TResult> expression that evaluates to the given Variable. |
![]() ![]() | Implicit(Variable<TResult>^ to Activity<TResult>^) | Returns a Activity<TResult> expression that evaluates to the given Variable<T>. |
Activity<TResult> is the base class in the activity type hierarchy. All other activity types with generic type definitions such as CodeActivity<TResult>, NativeActivity<TResult>, AsyncCodeActivity<TResult>, and DynamicActivity<TResult> derive from this class.
The following example shows how to derive a class from Activity<TResult>.
public sealed class AppendString : Activity<string> { // Input argument. [RequiredArgument] public InArgument<string> Name { get; set; } public AppendString() { // Define the implementation of this activity. this.Implementation = () => new Assign<string> { Value = new LambdaValue<string>(ctx => Name.Get(ctx) + " says hello world"), To = new LambdaReference<string>(ctx => Result.Get(ctx)), }; } }
Available since 4.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.





