DynamicActivity Class

Definition

Namespace:

System.Activities

Assembly:

System.Activities.dll

Provides an object model that allows you to construct activities dynamically that interface with the WF designer and runtime using ICustomTypeDescriptor.

public ref class DynamicActivity sealed : System::Activities::Activity, System::ComponentModel::ICustomTypeDescriptor

[System.Windows.Markup.ContentProperty("Implementation")]
public sealed class DynamicActivity : System.Activities.Activity, System.ComponentModel.ICustomTypeDescriptor

[<System.Windows.Markup.ContentProperty("Implementation")>]
type DynamicActivity = class
    inherit Activity
    interface ICustomTypeDescriptor

Public NotInheritable Class DynamicActivity
Inherits Activity
Implements ICustomTypeDescriptor

Inheritance

Object

Activity

DynamicActivity

Attributes

ContentPropertyAttribute

Implements

ICustomTypeDescriptor

Examples

The following example shows how to create a DynamicActivity.

// Variables
var iterationVariable = new DelegateInArgument<int>() { Name = "iterationVariable" };
var accumulator = new Variable<int>() { Default = 0, Name = "accumulator" };

// Define the Input and Output arguments that the DynamicActivity binds to
var numbers = new InArgument<List<int>>();
var average = new OutArgument<double>();

var result = new Variable<double>() { Name = "result" };

return new DynamicActivity()
{
    DisplayName = "Find average",
    Properties =
    {
        // Input argument
        new DynamicActivityProperty
        {
            Name = "Numbers",
            Type = typeof(InArgument<List<int>>),
            Value = numbers
        },
        // Output argument
        new DynamicActivityProperty
        {
            Name = "Average",
            Type = typeof(OutArgument<double>),
            Value = average
        }
    },
    Implementation = () =>
        new Sequence
        {
            Variables = { result, accumulator },
            Activities =
            {
                new ForEach<int>
                {
                    Values =  new ArgumentValue<IEnumerable<int>> { ArgumentName = "Numbers" },
                    Body = new ActivityAction<int>
                    {
                        Argument = iterationVariable,
                        Handler = new Assign<int>
                        {
                            To = accumulator,
                            Value = new InArgument<int>(env => iterationVariable.Get(env) +  accumulator.Get(env))
                        }
                    }
                },

                // Calculate the average and assign to the output argument.
                new Assign<double>
                {
                    To = new ArgumentReference<double> { ArgumentName = "Average" },
                    Value = new InArgument<double>(env => accumulator.Get(env) / numbers.Get(env).Count<int>())
                },
            }
        }

Constructors

DynamicActivity()

Creates a new instance of the DynamicActivity class.

Properties

Attributes	Gets the collection of attributes of the dynamically generated activity.
CacheId	Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity)
Constraints	Returns a collection of Constraint activities that are configured to provide validation for the DynamicActivity.
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 execution logic of the activity.
ImplementationVersion	Gets or sets the implementation version of the activity.
Name	The name to be displayed for the activity in the workflow designer.
Properties	Gets the collection of properties that map to the arguments of the dynamically generated activity.

Methods

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)
GetHashCode()	Serves as the default hash function. (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)
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)

Explicit Interface Implementations

ICustomTypeDescriptor.GetAttributes()	Returns a collection of attributes of the dynamic activity.
ICustomTypeDescriptor.GetClassName()	Returns the class name of the dynamic activity.
ICustomTypeDescriptor.GetComponentName()	Returns the component name of the dynamic activity.
ICustomTypeDescriptor.GetConverter()	Returns a type converter for the dynamic activity.
ICustomTypeDescriptor.GetDefaultEvent()	Returns the default event for the dynamic activity.
ICustomTypeDescriptor.GetDefaultProperty()	Returns the default property for the dynamic activity.
ICustomTypeDescriptor.GetEditor(Type)	Returns an editor with the specified base type.
ICustomTypeDescriptor.GetEvents()	Returns the collection of events of the dynamic activity.
ICustomTypeDescriptor.GetEvents(Attribute[])	Returns the collection of events of the dynamic activity using a specified array of attributes as a filter.
ICustomTypeDescriptor.GetProperties()	Returns the collection of properties of the dynamic activity.
ICustomTypeDescriptor.GetProperties(Attribute[])	Returns the collection of properties of the dynamic activity using a specified array of attributes as a filter.
ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor)	Returns this instance of the DynamicActivity class.