Dynamics自定义工作流输出参数在流程设计器中不显示

我在高校担任CRM开发人员，使用基于MS Dynamics的高等教育CRM系统Ellucian。测试自定义工作流时遇到问题：代码中明确定义了字符串类型的输出参数，但注册完成后，输入参数在设计器中正常显示，将该自定义工作流作为流程第二步调用时，输出参数却不显示。

自定义工作流代码 #

using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Workflow;
using System;
using System.Activities;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WheatonPluginDelta.Activities
{
    public class AppointmentPopulateSpouse1 : CodeActivity
    {
        [RequiredArgument]
        [Input("Person")]
        [ReferenceTarget("contact")]
         public InArgument<EntityReference> PersonRef { get; set; }

        [RequiredArgument]
        [Input("Appointment")]
        [ReferenceTarget("appointment")]
        public InArgument<EntityReference> AppointmentRef { get; set; }

        [Output("output string")]
        public OutArgument<string> MyOutput { get; set; }

        protected override void Execute(CodeActivityContext executionContext)
        {
            ITracingService tracingService = executionContext.GetExtension<ITracingService>();
            IWorkflowContext workflowContext = executionContext.GetExtension<IWorkflowContext>();
            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            IOrganizationService orgService = serviceFactory.CreateOrganizationService(workflowContext.UserId);

            EntityReference personRef = PersonRef.Get(executionContext);
            EntityReference appointmentRef = AppointmentRef.Get(executionContext);

            var appointment = new Entity("appointment", appointmentRef.Id);

            var spouse = orgService.Retrieve("contact", personRef.Id, new ColumnSet("spousesname"));

            if (spouse["spousesname"] != null)
            {
                MyOutput.Set(executionContext, spouse["spousesname"]);
            }
            else
            {
                MyOutput.Set(executionContext, "no spouse found");
            }
        }
    }
}

问题细节 #

• 工作流注册完成后，输入参数在设计器中正常展示
• 将该工作流添加为流程的第二步时，界面仅显示输入参数，无输出参数选项

恳请各位提供排查思路或解决方法。

内容的提问来源于stack exchange，提问作者yhwang