WorkflowInvoker.InvokeCompleted 事件

定义

命名空间:

System.Activities

程序集:

System.Activities.dll

在完成或取消由一种 InvokeAsync 重载调用的工作流时发生。

public:
 event EventHandler<System::Activities::InvokeCompletedEventArgs ^> ^ InvokeCompleted;

public event EventHandler<System.Activities.InvokeCompletedEventArgs> InvokeCompleted;

member this.InvokeCompleted : EventHandler<System.Activities.InvokeCompletedEventArgs> 

Public Event InvokeCompleted As EventHandler(Of InvokeCompletedEventArgs) 

事件类型

EventHandler<InvokeCompletedEventArgs>

示例

下面的示例调用包含单个 LongRunningDiceRoll 活动的工作流。 LongRunningDiceRoll 活动包含两个表示掷骰子操作结果的输出自变量。 当工作流完成时，将在 InvokeCompleted 处理程序中检索这些参数。

public sealed class LongRunningDiceRoll : Activity
{
    public OutArgument<int> D1 { get; set; }
    public OutArgument<int> D2 { get; set; }

    public LongRunningDiceRoll()
    {
        this.Implementation = () => new Sequence
        {
            Activities =
            {
                new WriteLine
                {
                    Text = "Rolling the dice for 5 seconds."
                },
                new Delay
                {
                    Duration = TimeSpan.FromSeconds(5)
                },
                new DiceRoll
                {
                    D1 = new OutArgument<int>(env => this.D1.Get(env)),
                    D2 = new OutArgument<int>(env => this.D2.Get(env))
                }
            }
        };
    }
}

AutoResetEvent syncEvent = new AutoResetEvent(false);

WorkflowInvoker invoker = new WorkflowInvoker(new LongRunningDiceRoll());

invoker.InvokeCompleted += delegate(object sender, InvokeCompletedEventArgs args)
{
    if (args.Cancelled == true)
    {
        Console.WriteLine("Workflow was cancelled.");
    }
    else if (args.Error != null)
    {
        Console.WriteLine("Exception: {0}\n{1}",
            args.Error.GetType().FullName,
            args.Error.Message);
    }
    else
    {
        Console.WriteLine("The two dice are {0} and {1}.",
            args.Outputs["D1"], args.Outputs["D2"]);
    }

    syncEvent.Set();
};

invoker.InvokeAsync("InvokeAsync Example");

Console.WriteLine("Waiting for the workflow to complete.");

// Wait for the workflow to complete.
syncEvent.WaitOne();

Console.WriteLine("The workflow is complete.");

注解

处理此事件可确定使用 InvokeAsync 重载之一调用的工作流是否成功完成，并检索完成的工作流的输出自变量。