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.
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>
Assembly: System.Activities (in System.Activities.dll)
The Activity<TResult> type exposes the following members.
| 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 | Gets or sets the delegate that returns an Activity that contains the execution logic. (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 | 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 | 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 a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | 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)), }; } }
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.
