SendActivity in Workflow

Introduction : SendActivity, can be used to send requests to WCF services. The SendActivity activity enables you to participate in a conversation with a WCF service using a predefined message exchange pattern. The SendActivity activity is a blocking activity, meaning that workflow execution will be blocked until the activity completes execution. The SendActivity is used to call an operation exposed by a WCF service from an executing workflow instance. The Workflow Service generates a proxy for the call according to properties of the SendActivity, including the selected service contract and associated WCF configuration settings. The response from a SendActivity can be stored and used by the running workflow instance, including reported exceptions.

SendActivity Classes :

• System.Object.
• System.Workflow.ComponentModel.DependencyObject.
• System.Workflow.ComponentModel.Activity.
• System.Workflow.Activities.SendActivity.
  

Step 1 : Open Visual Studio2010.

• Go to File->New-> Project.
• Select Workflow->Framework 3.5.
• Select SequentialWorkflowApplication.

Step 2 : Drag activity from Toolbox.

• Send Activity, Code Activity.

Step 3 : Go to Solution Explorer and Right-click.

• Add->New Item.
• Select WCFServiceApplication.

Step 4 : Write the below code :

Code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Workflow.Runtime;
using System.Workflow.Runtime.Hosting;
namespace WorkflowConsoleApplication1
class Program
{
    public sealed partial class Workflow1 : SequentialWorkflowActivity
    {
        public Workflow1()
        {
            InitializeComponent();
        }
        public static DependencyProperty sendActivity1__ReturnValueProperty = DependencyProperty.Register("sendActivity1__ReturnValue", ty(System.String), typeof(SendActivitySample.Workflow1));
        public String sendActivity1__ReturnValue
        {
            get
            {
                return ((string)(base.GetValue(SendActivitySample.Workflow1.sendActivity1__ReturnValueProperty)));
            }
            set
            {
                base.SetValue(SendActivitySample.Workflow1.sendActivity1__ReturnValueProperty, value);
            }
        }
        private void codeActivity1_ExecuteCode(object sender, EventArgs e)
        {
            Console.WriteLine(GetValue(Workflow1.sendActivity1__ReturnValueProperty));
        }
    }
}
}   

Step 5 : Go to Workflow1.cs and select the Design option.

• Select SendActivity1 property.
• Give the Enabled Value True.

Step 6 : Now go to the program's file and write the below code.

Code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
namespace DeclarativeServiceLibrary2
{
    public class Class1
    {
    public interface IMyService
   {
        string GetResponse(string value);
    }
        public class MyService : IMyService
    {
        #region IMyService Members
        public string GetResponse(string value)
        {
            return string.Format("Hello {0}!", value);
        }
        #endregion
    }
}

Step 7 : Press F5 to run it.