WCF Service in Workflow

Introduction : The Window Communication Foundation (WCF) is service-oriented application. With the help of WCF we can send a data from one service to another. The Workflow is simply encapsulate activities for Window Communication Foundation. WCF is designed to offer a manageable approach to creating Web services and Web service clients.

Step 1 : Open Visual Studio.

• Select File->New->Project.
• Select WCF Workflow Service Application.
• Click OK.

After OK the following activity show.

Step 2 : Drag activity from Toolbox.

•  Drag Flowchart activity.

Step 3 : Define Variables for application.

• Select Sequence Activity.
• Click in Variables option.
• Define Name, Variables Type.

Step 4 : Go to Solution Explorer and right-click in project option.

• Select Add->New Item.
• Select Code Activity.

Write down the following code:

Code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using System.IO;
namespace DeclarativeServiceLibrary1
{
    public sealed class CodeActivity1 : CodeActivity
    {
        // Define an activity input argument of type string
        public InArgument<string> Text { get; set; }
        // If your activity returns a value, derive from CodeActivity<TResult>
        // and return the value from the Execute method.
        public OutArgument<string> result { get; set; }
        protected override void Execute(CodeActivityContext context)
        {
            // Obtain the runtime value of the Text input argument
            string text = context.GetValue(this.Text);
            File.AppendAllText(@"C:\WorkflowLog.txt", "Result is:" + text);
            context.SetValue(result, "Result is:" + text);
        }
    }
}


Step 5 : Go to the Design option.

• Select ReciveRequest activity.
• Right-click->Properties option.
• Define operationname, ServiceContractName.

Step 6 : Double-click in Flowchart.

• Drag Switch activity, CodeActivity1 from Toolbox.

Step 7 : Click on CodeActivtiy1.

• Go to Properties option and define result and Text value.

Value :

(operat1 * operat2).ToString()

Similarly for add, subtract define a Text Value.

Step 8 : Press F6 and Build the application.

Step 9 : Now we define the service path for the application.

• Go to calculate.xamlx option.
• Right-click ->Browse.
• Firefox->Add option.
• Add WcfTestClient.exe.

Step 10 : Go to the Web option.

• Select Start external program.
• Define Web Service path.

Step 11: Press F5 and run the application.

Step 12 :  Right-click in My Service Project.

• Add Service.

Step 13 : Now we click calculate option and add thee any parameter.

Click in Invoke option Find the result.