ForEach<T> Class

Definition

Namespace:

System.Activities.Statements

Assembly:

System.Activities.dll

Executes an activity action once for each value provided in the Values collection.

generic <typename T>
public ref class ForEach sealed : System::Activities::NativeActivity

[System.Windows.Markup.ContentProperty("Body")]
public sealed class ForEach<T> : System.Activities.NativeActivity

[<System.Windows.Markup.ContentProperty("Body")>]
type ForEach<'T> = class
    inherit NativeActivity

Public NotInheritable Class ForEach(Of T)
Inherits NativeActivity

Type Parameters

T

The type of the values provided in the Values collection.

Inheritance

Object

Activity

NativeActivity

ForEach<T>

Attributes

ContentPropertyAttribute

Examples

The following code sample demonstrates creating a ForEach<T> activity.

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))
        }
    }
},

Remarks

ForEach<T> is similar to the keyword foreach but is implemented as an activity rather than a language statement. Note that unlike foreach in C#, the ForEach<T> activity uses GetEnumerator, rather than IEnumerator<T>.

Constructors

ForEach<T>()

Creates a new instance of the ForEach<T> class.

Properties

Body	The ActivityAction to be executed for each item in the Values collection.
CacheId	Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity)
CanInduceIdle	Gets or sets a value that indicates whether the activity can cause the workflow to become idle. (Inherited from NativeActivity)
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	The execution logic of the activity. (Inherited from NativeActivity)
ImplementationVersion	Gets or sets the implementation version of the activity. (Inherited from NativeActivity)
Values	The activity's collection of inputs for the execution of the Body activity action.

Methods

Abort(NativeActivityAbortContext)	When implemented in a derived class, takes actions in response to the activity being aborted. (Inherited from NativeActivity)
CacheMetadata(ActivityMetadata)	Not implemented. Use the CacheMetadata(NativeActivityMetadata) method instead. (Inherited from NativeActivity)
CacheMetadata(NativeActivityMetadata)	Creates and validates a description of the activity's arguments, variables, child activities, and activity delegates. (Inherited from NativeActivity)
Cancel(NativeActivityContext)	When implemented in a derived class, runs logic to cause graceful early completion of the activity. (Inherited from NativeActivity)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Execute(NativeActivityContext)	When implemented in a derived class, runs the activity's execution logic. (Inherited from NativeActivity)
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(NativeActivityUpdateMapMetadata, Activity)	Raises an event when creating a map for the dynamic update. (Inherited from NativeActivity)
OnCreateDynamicUpdateMap(UpdateMapMetadata, Activity)	Raises an event when creating a map for the dynamic update. (Inherited from NativeActivity)
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)
UpdateInstance(NativeActivityUpdateContext)	Updates the instance of NativeActivity. (Inherited from NativeActivity)