WF4 Workflow Service:SendParameters和ReceiveParameters

本文主要介绍如何使用SendParameters和ReceiveParameters的使用，这两个活动允许你在调用服务的时候携带多个参数。 在Workflow Service上主要体现在Send，Receive，SendReply，ReceiveReply活动的Content属性的设置上。

下面的例子将通过使用SendParameters和ReceiveParameters将参数从客户端传到服务端，确认后给客户端发送回复。
 

1.服务端工作流ServiceWF流程设置如下图： 

工作流变量如下：

Name	Type	Scope	Default
servicemsg	String	Sequence
para	String	Sequence

流程设计如下：

 

使用WorkflowServiceHost宿主工作流如下：

class Program

    {

       static void Main(string[] args)

        {               

            WorkflowService service = new WorkflowService

            {

                Name = "CaryService",

                Body = new cary.ServiceWF()

            };

            Uri address = new Uri("http://localhost:8080/CaryWFServices");

            WorkflowServiceHost host = new WorkflowServiceHost(service, address);

            try

            {

                Console.WriteLine("Opening service...");

                host.Open();

                Console.WriteLine("Service is listening on {0}...", address);

                Console.WriteLine("To terminate press ENTER");

                Console.ReadLine();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Service terminated with exception {0}", ex.ToString());

            }

            finally

            {

                host.Close();

            }

        }

    }

2.客户端工作流ClientWF流程设置如下图：

工作流变量如下：

Name	Type	Scope	Default
Clientmsg	String	Sequence	“I am a client Message1”
Result	String	Sequence

 

流程设计如下：

客户端调用程序如下：

class Program

    {       

        static void Main(string[] args)

        {           

            try

            {

                WorkflowInvoker.Invoke(new cary.ClientWF());

                Console.WriteLine("Workflow completed successfully.");

            }

            catch (Exception e)

            {

            Console.WriteLine("Workflow completed with {0}: {1}.", e.GetType().FullName, e.Message);            }

            Console.WriteLine("To exit press ENTER.");

            Console.ReadLine();

        }       

    } 

3.结果如下：