卸载和加载工作流实例后无法调用事件

问题描述

大家好，
我是工作流程的新手.我创建了一个新的工作流程，并在单击按钮事件后将其卸载，并在触发另一个按钮后加载了该事件.但是在这里，我无法从一种状态转移到另一种状态.这是我的代码:

Hi Everybody,
I am new to workflows. I am created a new workflow and i unloaded it after a button click event and I am loading the event after firing another button. But here I am not able to move from one state to other state. Here my code is:

protected void SendData_Click(object sender, EventArgs e)
        {
            Guid state_ID = Guid.NewGuid();
            Dictionary<string,> Params = new Dictionary<string,>();
            WorkflowInstance instance = null;
            StateMachineWorkflowInstance ins = null;
            SqlWorkflowPersistenceService sqlPersistenceService = new SqlWorkflowPersistenceService(ConfigurationManager.ConnectionStrings["PersistenceConnectionString"].ToString());

            WorkFlowDemo.states.state state = new WorkFlowDemo.states.state();
            ExternalDataExchangeService ExDateExchService = new ExternalDataExchangeService();
            WorkflowRuntime workflowRuntime = new WorkflowRuntime();
            workflowRuntime.AddService(sqlPersistenceService);
            workflowRuntime.AddService(ExDateExchService);
            //workflowRuntime.InstanceStore = store;
            ExDateExchService.AddService(state);
            instance =
                workflowRuntime.CreateWorkflow(typeof(Workflow1), Params, state_ID);
            Session["state_ID"] = state_ID;
            instance.Start();
            ins = new StateMachineWorkflowInstance(workflowRuntime, state_ID);
            state.SubmitContent(state_ID);

            if (ins.CurrentStateName == "Submitted")
            {
                SendData.Visible = false;
                Approve.Visible = true;
                Reject.Visible = true;
                Incomplete.Visible = true;
                Cancel.Visible = true;
            }
            instance.Unload();
        }

 protected void Approve_Click(object sender, EventArgs e)
        {
            Guid state_ID = Guid.NewGuid();
            Dictionary<string,> Params = new Dictionary<string,>();
            WorkflowInstance instance = null;
            StateMachineWorkflowInstance ins = null;
            SqlWorkflowPersistenceService sqlPersistenceService = new SqlWorkflowPersistenceService(ConfigurationManager.ConnectionStrings["PersistenceConnectionString"].ToString());


            //WorkFlowDemo.states.state state = new WorkFlowDemo.states.state();
            //ExternalDataExchangeService ExDateExchService = new ExternalDataExchangeService();
            //WorkflowRuntime workflowRuntime = new WorkflowRuntime();
            //workflowRuntime.AddService(sqlPersistenceService);
            //workflowRuntime.AddService(ExDateExchService);
            ////workflowRuntime.InstanceStore = store;
            //ExDateExchService.AddService(state);
            //instance =
            //    workflowRuntime.CreateWorkflow(typeof(Workflow1), Params, state_ID);

            
            WorkFlowDemo.states.state state = new WorkFlowDemo.states.state();
            ExternalDataExchangeService ExDateExchService = new ExternalDataExchangeService();
            WorkflowRuntime workflowRuntime = new WorkflowRuntime();
            workflowRuntime.AddService(sqlPersistenceService);
            workflowRuntime.AddService(ExDateExchService);
            Guid workflowId = new Guid(Session["state_ID"].ToString());
            //workflowRuntime.CurrentWorkflowInstanceID = workflowId;
            workflowRuntime.StartRuntime();

            if (workflowRuntime.IsStarted)
            {
                instance = workflowRuntime.GetWorkflow(workflowId);
            }
            instance.Load();
            //instance.ReloadTrackingProfiles();
            //workflowRuntime.AddService(ExDateExchService);
            state.Approved(state_ID);
            ins = new StateMachineWorkflowInstance(workflowRuntime, state_ID);

            if (ins.CurrentStateName == "Complete")
            {
                Data.Visible = true;
                Data.InnerText = "Approved";
                ContentTextBox.Visible = false;
                SendData.Visible = false;
                Approve.Visible = false;
                Reject.Visible = false;
                Incomplete.Visible = false;
                Cancel.Visible = false;
                if (workflowRuntime != null)
                {
                    workflowRuntime.StopRuntime();
                    workflowRuntime.Dispose();
                }
            }
        }

这里的事件是

Here events are

namespace WorkFlowDemo
{
   public class states
    {
       [Serializable]
       public class state: Istates,ISendDataService
       {
           private string getassigneddata;
           public event EventHandler<System.Workflow.Activities.ExternalDataEventArgs> submitted;
           public event EventHandler<System.Workflow.Activities.ExternalDataEventArgs> approved;
           public event EventHandler<System.Workflow.Activities.ExternalDataEventArgs> rejected;
           public event EventHandler<System.Workflow.Activities.ExternalDataEventArgs> completed;
           public event EventHandler<ReceivedDataEventArgs> ReceivedDataEvent;

           public void SubmitContent(Guid instanceID)
           {
               if (this.submitted != null)
               {
                  this.submitted(this, new System.Workflow.Activities.ExternalDataEventArgs(instanceID));
               }
           }

           public void Rejected(Guid instanceID)
           {
               if (this.rejected != null)
               {
                   this.rejected(this, new System.Workflow.Activities.ExternalDataEventArgs(instanceID));
               }
           }

           public void Approved(Guid instanceID)
           {
               if (this.approved != null)
                   this.approved(this, new System.Workflow.Activities.ExternalDataEventArgs(instanceID));
           }


}
}
}

加载工作流程后，任何人都可以告诉我如何从一种状态转换为另一种状态吗?

Can any body tell how can i move from one state to other state after loading the work flow

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