NativeActivity Classe

Définition

public ref class NativeActivity abstract : System::Activities::Activity

public abstract class NativeActivity : System.Activities.Activity

type NativeActivity = class
    inherit Activity

Public MustInherit Class NativeActivity
Inherits Activity

Héritage

Object

Activity

NativeActivity

Dérivé

System.Activities.Statements.CancellationScope

System.Activities.Statements.Compensate

System.Activities.Statements.Confirm

System.Activities.Statements.Delay

System.Activities.Statements.DeleteBookmarkScope

Plus…

Exemples

L'exemple de code suivant montre comment créer une classe qui hérite de NativeActivity<TResult>. Cet exemple provient de l’exemple Composite personnalisé à l’aide d’une activité native .

public sealed class MySequence : NativeActivity  
{  
    Collection<Activity> children;  
    Collection<Variable> variables;  
    Variable<int> currentIndex;  
    CompletionCallback onChildComplete;  

    public MySequence()  
        : base()  
    {  
        this.children = new Collection<Activity>();  
        this.variables = new Collection<Variable>();  
        this.currentIndex = new Variable<int>();  
    }  

    public Collection<Activity> Activities  
    {  
        get  
        {  
            return this.children;  
        }  
    }  
    public Collection<Variable> Variables  
    {  
        get  
        {  
            return this.variables;  
        }  
    }  
    protected override void CacheMetadata(NativeActivityMetadata metadata)  
    {  
        //call base.CacheMetadata to add the Activities and Variables to this activity's metadata  
        base.CacheMetadata(metadata);  
        //add the private implementation variable: currentIndex   
        metadata.AddImplementationVariable(this.currentIndex);  
    }                     

    protected override void Execute(NativeActivityContext context)  
    {  
        InternalExecute(context, null);  
    }  
    void InternalExecute(NativeActivityContext context, ActivityInstance instance)  
    {  
        //grab the index of the current Activity  
        int currentActivityIndex = this.currentIndex.Get(context);  
        if (currentActivityIndex == Activities.Count)  
        {  
            //if the currentActivityIndex is equal to the count of MySequence's Activities  
            //MySequence is complete  
            return;  
        }  

        if (this.onChildComplete == null)  
        {  
            //on completion of the current child, have the runtime call back on this method  
            this.onChildComplete = new CompletionCallback(InternalExecute);  
        }  
        //grab the next Activity in MySequence.Activities and schedule it  
        Activity nextChild = Activities[currentActivityIndex];  
        context.ScheduleActivity(nextChild, this.onChildComplete);  

        //increment the currentIndex  
        this.currentIndex.Set(context, ++currentActivityIndex);  
    }  
}  

Constructeurs

Propriétés

Méthodes

S’applique à