Work with XAML in Workflow

Introduction : The Extensible Application Markup Language (XAML) is a new declarative language is used in Windows Framework and Windows Presentation Foundation.

XAML is used for initializing structured values and objects. The XAML define UI element, Data Binding, Event. The use of workflow markup with code-beside logic files is similar to how ASP.NET separates presentation files from logic files.

Step 1 : Open Visual Studio.

Select File->New-> Project.
Select Sequential Workflow Console Application.

Step 2 : Go to Solution Explorer and right-click.

Select Workflow1.cs file.
Delete Workflow1.cs file form project for display the XAML.

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

Add-> New Item->Workflow.
Select Sequential Workflow Code Separation.

Step 4 : Go to Solution Explorer and see Workflow.xoml file create.

Click Workflow.xoml file and open with.
XML editor option open.
The look like following code.

Drag While activity from Toolbox.
Go to Workflow.xoml option following code will be add.

Code :

<SequentialWorkflowActivity x:Class="myxmsapplication.Workflow2" x:Name="Workflow2" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow">
<WhileActivity x:Name="whileActivity1">
<WhileActivity.Condition>
<RuleConditionReference ConditionName="Condition1" />
</WhileActivity.Condition>
</WhileActivity>
</SequentialWorkflowActivity>

Step 6 : Go to Workflow.xoml.cs file and add following code.

Code :

public partial class Workflow2 : SequentialWorkflowActivity
{
public Int32 counter;
}

Step 7 : Go to Workflow.xoml design option.

Right-click-> Properties option.
Define Condition, Condition Name.

Condition :

this.counter != 10

Step 8 : Go to Design option and drag activty from Toolbox.

Drag If-Else, Code activity.
Define the condition.

Condition :

this.counter % 2 == 0
this.counter % 2 != 0

Step 9 : Now we double-click in CodeActivty1, CodeActivity2.

Write the below code.

Code :

private void codeActivity1_ExecuteCode(object sender, EventArgs e)
{
Console.WriteLine("Hello! " + Convert.ToString(counter) +" is an even number!");

counter++;
}
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
Console.WriteLine("Hello! " + Convert.ToString(counter) +" is an odd number!");

counter++;
}

Step 10 : We open Workflow.xoml option add following code.

Code :

<SequentialWorkflowActivity x:Class="myxmsapplication.Workflow2" x:Name="Workflow2" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow">|
<WhileActivity x:Name="whileActivity1">
<WhileActivity.Condition>
<RuleConditionReference ConditionName="Condition1" />
</WhileActivity.Condition>
<IfElseActivity x:Name="ifElseActivity1">
<IfElseBranchActivity x:Name="ifElseBranchActivity1">
<IfElseBranchActivity.Condition>
<RuleConditionReference ConditionName="Condition2" />
</IfElseBranchActivity.Condition>
<CodeActivity x:Name="codeActivity1" ExecuteCode="codeActivity1_ExecuteCode" />
</IfElseBranchActivity>
<IfElseBranchActivity x:Name="ifElseBranchActivity2">
<IfElseBranchActivity.Condition>
<RuleConditionReference ConditionName="Condition3" />
</IfElseBranchActivity.Condition>
<CodeActivity x:Name="codeActivity2" ExecuteCode="codeActivity2_ExecuteCode" />
</IfElseBranchActivity>
</IfElseActivity>
</WhileActivity>
</SequentialWorkflowActivity>

Step 11 : Now we Program.cs file add following 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;
using System.Workflow.Activities;
namespace myxmsapplication
{
class Program
{
static void Main(string[] args)
{
using (WorkflowRuntime workflowRuntime = new WorkflowRuntime())
{
AutoResetEvent waitHandle = new AutoResetEvent(false);
workflowRuntime.WorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e) { waitHandle.Set(); };
workflowRuntime.WorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e)
{
Console.WriteLine(e.Exception.Message);
waitHandle.Set();
};
WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(myxmsapplication.Workflow1));
instance.Start();
waitHandle.WaitOne();
Console.ReadKey();
}
}
}
}

Step 12 : Press F5 and run the application.