Windows Workflow Foundation enables the developers to create workflow enabled applications. A typical workflow application can be a helpdesk application where the user submits a ticket and his request is answered in a certain manner.
Windows Workflow Foundation enables the developers to create workflow enabled applications. A typical workflow application can be a helpdesk application where the user submits a ticket and his request is answered in a certain manner.
Here is a simple workflow that deposit and withdraw the amount from the user's account. This workflow is in no way complete and this is just to show how to run a workflow from an ASP.NET application.
First, the user is authenticated. After authentication the user's amount is deposited or withdrawn from his account.
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Here is the code that runs behind the workflow.
public sealed partial class BankAccountWorkflow: SequentialWorkflowActivity
{
private User _user = new User();
private bool _isCompleted;
public bool IsCompleted
{
get { return _isCompleted; }
set { _isCompleted = value; }
}
public User User
{
get { return _user; }
set { _user = value; }
}
public BankAccountWorkflow()
{
InitializeComponent();
}
private void AuthenticateUser(object sender, EventArgs e)
{
UserManager.AuthenticateUser(_user);
}
private void DepositAmount(object sender, EventArgs e)
{
bool result = UserManager.DepositAmount(_user);
if (result)
_isCompleted = true;
else _isCompleted = false;
}
private void WithdrawAmount(object sender, EventArgs e)
{
bool result = UserManager.WithdrawAmount(_user);
if (result)
_isCompleted = true;
else _isCompleted = false;
}
}
As, you can see I am NOT even authenticating the user and just letting them into the system.
Now, let's see the client code which is used to execute the workflow.
protected void Btn_Submit_Click(object sender, EventArgs e)
{
Dictionary<string, object> parameters = new Dictionary<string, object>();
parameters.Add("User", new User() { UserName = txtUserName.Text, Password = txtPassword.Text,
TransactionType = ddlTransType.SelectedValue, Amount = Double.Parse(txtAmount.Text) });
WorkflowRuntime wfRuntime = Global.wrRuntime;
wfRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(TransactionCompleted);
WorkflowInstance instance = wfRuntime.CreateWorkflow(typeof(BankAccountWorkflow),parameters);
// start the workflow
instance.Start();
}
void TransactionCompleted(object sender, WorkflowCompletedEventArgs e)
{
string message = ( (bool) e.OutputParameters["IsCompleted"] == true) ? "Transaction completed successfully" : "Error in the transaction";
}
I hope you got some idea on how to trigger the workflow from the ASP.NET application. In the future I will provide a full article on implementing the same scenario.