Work with Parallel Activity in Workflow

Introduction : The Parallel activity allows multiple activities to execute at the same time. This does not mean the Parallel activity permits parallel processing across multiple threads - only a single thread will execute inside of a workflow. Instead, the Parallel activity allows separate branches inside the activity to execute independently.

Let see how to create Parallel activity :

Step : 1 Create an Workflow Console Application.

Open Visual Studio.
Select File->New->Project.
Select Workflow Console Application.

Step : 2 Drag Flowchart activity to the designer to place the different activities anywhere on the palette.

Step : 3 Drag a FlowSwitch activity to the bottom of the Workflow.

Step : 4 Drag a WriteLine activity to display a standard greeting message and set the Display Name Winter, Spring, Summer , Autumn and Default.

Step : 5 Drag a Parallel activity to the bottom of Workflow. Draw a connection from each of the WriteLine activities to the Parallel activity.

Adding the Branches :

Step : 6 Double click in Parallel activity and drag three WriteLine activities. One of these activities will display the

Date.
Time.
Day of the week.

Enter one of these expression for the Text property on each of the WriteLine activities.

Expression :

"Time: " + DateTime.Now.TimeOfDay.ToString()
"Date: " + DateTime.Now.Date.ToShortDateString()
"Today is: " + DateTime.Now.ToString("dddd")

Step : 7 Open program.cs file and write a code.

Code :

using System;
using System.Linq;
using System.Activities;
using System.Activities.Statements;
namespace WorkflowConsoleApplication11
{
class Program
{
static void Main(string[] args)
{
WorkflowInvoker.Invoke(new Workflow1());
Console.WriteLine("Hello");
Console.WriteLine("Press Enter to exit");
Console.ReadLine();
}
}
}
Step : 8 PressF5 and run application.