Windows Workflow基础状态机编程 [英] Windows Workflow foundation state machine programming

问题描述

您好我是Windows Workflow基础的新手，并尝试使用对象模型编写工作流（状态机）。我正在获取此错误



StateMachineActivity1必须具有初始状态。



可以任何身体请给我答案。我的代码如下......提前致谢

Hello I am new to Windows Workflow foundation and try to write workflow (State Machine ) using Object Model. I am Getting This error

StateMachine "Activity1" Must have an initial state .

Can any body please give me answer . My code is below...Thanks in advance

Activity SMwf = new StateMachine()
           {

               States =
               {
                  new State(){
                     Entry = new Sequence()
                     {
                         Activities = {

                             new WriteLine(){Text="Entry Point....."},
                             new Delay(){ Duration = TimeSpan.FromSeconds(30)}
                         }
                     },
                     Exit = new Sequence(){
                           Activities = {

                               new WriteLine(){Text = "Exit Point"},
                               new Delay(){ Duration = TimeSpan.FromSeconds(30)}
                           }
                     },
                     Transitions = {
                         new Transition {
                         DisplayName ="T1",
                         Action ={},
                         Condition={
                         },

                         }

                     },
                     DisplayName ="State1",

                  },
                  new State(){
                     Entry = new Sequence()
                     {
                         Activities = {

                             new WriteLine(){Text="Entry Point....."},
                             new Delay(){ Duration = TimeSpan.FromSeconds(30)}
                         }
                     },
                     Exit = new Sequence(){
                           Activities = {

                               new WriteLine(){Text = "Exit Point"},
                               new Delay(){ Duration = TimeSpan.FromSeconds(30)}
                           }
                     },
                     DisplayName ="State1",

                  }
               },
               DisplayName = "Activity1",


           };

           try
           {
               WorkflowInvoker.Invoke(SMwf);
           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.Message);
           }

推荐答案

您需要设置 InitialState [ ^ ]到应该开始的特定状态处理。您可以在调用 WorkflowInvker.Invoke（SMwf）; 之前设置它：

You need to set InitialState[^] to the particular state that should start off the processing. You could set it before you call WorkflowInvker.Invoke(SMwf); like this:

StateMachine sm = (StateMachine)SMwf;
sm.InitialState = sm.States[0];

更好的是，不要执行转换 - 创建SMwf作为 StateMachine 而不是活动。

Better still, don't do the cast - create SMwf as a StateMachine instead of an Activity.

谢谢但是现在它给出了错误Activity1必须至少有一个Transition

Thanks But Now it gives error that Activity1 must have atleast one Transition

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