public static bool CreateApprovalWorkflow(string xaml, ExpenseData expData)
        {
            bool flag = true;
            var mer = new ManualResetEvent(false);
            IDictionary<string, object> dic = new Dictionary<string, object>
            {
                {"expenseData",expData}
            };
            SqlWorkflowInstanceStore instanceStore = new SqlWorkflowInstanceStore(@"Data Source=TC11080\SQLEXPRESS;Initial Catalog=FinancialAffairs;Integrated Security=True;");
            InstanceView view = instanceStore.Execute(instanceStore.CreateInstanceHandle(), new CreateWorkflowOwnerCommand(), TimeSpan.FromSeconds(30));
            instanceStore.DefaultInstanceOwner = view.InstanceOwner;

            WorkflowApplication app = new WorkflowApplication(ActivityXamlServices.Load(xaml), dic);
            app.InstanceStore = instanceStore;
            app.PersistableIdle = (e) =>
                {
                    mer.Set();
                    return PersistableIdleAction.Unload;
                };
            app.Unloaded = (e) =>
                {
                    mer.Set();
                };
            app.OnUnhandledException = (e) =>
                {
                    flag = false;
                    mer.Set();
                    return UnhandledExceptionAction.Terminate;
                };
            app.Completed = (e) =>
                {
                    mer.Set();
                };
            //application.Extensions.Add(CustomTrackingProfile.GetTracking());
            app.Run();
            mer.WaitOne();
            return flag;
        }

下面是活动

 public sealed class CreateCodeActivity : NativeActivity
    {
        // 定义一个字符串类型的活动输入参数
        public InOutArgument<ExpenseData> expen { get; set; }
        public InArgument<int> version { get; set; }

        // 如果活动返回值，则从 CodeActivity<TResult>
        // 派生并从 Execute 方法返回该值。
        protected override void Execute(NativeActivityContext context)
        {
            ExpenseData epdata =  context.GetValue(expen);
            int workflowVersion = context.GetValue(version);
            epdata.ExpenseId = new ExpenRule().AddExpen(epdata, context.WorkflowInstanceId, workflowVersion);
            epdata.InstanceID = context.WorkflowInstanceId;
            this.expen.Set(context, epdata);
        }
    }

epdata 为null，值丢失了，workflowVersion 应该为1，此次获取到值是0

求大虾解答