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1. You are writing a sequential console workflow that consists of a delay activity and a code activity, as
shown in the exhibit. (Click the Exhibit button for the sequential console workflow image.)
In the execution code of the second activity, you try to modify the workflow as follows:
Private Sub delayActivity_InitializeTimeoutDuration(ByVal sender As System.Object, ByVal e As
System.EventArgs)
Console.Title = "Modifiability of a Workflow"
Console.WriteLine("Wait ...")
End Sub
Private Sub codeActivity_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim delay As DelayActivity = CType(sender, DelayActivity)
Console.WriteLine(delay.Name)
Dim workflowChanges As New WorkflowChanges(Me)
Dim codeActivity As New CodeActivity()
codeActivity.Name = "codeActivity2"
AddHandler codeActivity.ExecuteCode, AddressOf Me.codeActivity2_ExecuteCode
workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Me.ApplyWorkflowChanges(workflowChanges)
End Sub
Private Sub codeActivity2_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim codeActivity As CodeActivity = CType(sender, CodeActivity)
Console.WriteLine(codeActivity.Name)
Console.ReadLine()
End Sub
You also have set the modifiability of the workflow to a code condition that is set to the following function:
Private Sub UpdateCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs)
If (TimeSpan.Compare(Me.delayActivity.TimeoutDuration, New TimeSpan(0, 0, 5)) > 0) Then
e.Result = False
Else
e.Result = True
End If
End Sub
Which code segment should you use to handle the exception?
A. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
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Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As ArgumentOutOfRangeException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
B. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As InvalidProgramException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
C. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As InvalidOperationException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
D. workflowChanges.TransientWorkflow.Activities.Add(codeActivity)
Try
Me.ApplyWorkflowChanges(workflowChanges)
Catch ex As OverflowException
Console.WriteLine(ex.GetType().ToString())
Console.ReadLine()
End Try
Answer: C
2. A custom activity defined in an assembly named LitwareActivities is defined as follows:
Namespace LitwareActivities
Public Class WriteLineActivity
Inherits Activity
Protected Overrides Function Execute(ByVal executionContext As
System.Workflow.ComponentModel.ActivityExecutionContext) _
As System.Workflow.ComponentModel.ActivityExecutionStatus
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Console.WriteLine(Message)
Return ActivityExecutionStatus.Closed
End Function
Private aMessage As String
Public Property Message() As String
Get
Return aMessage
End Get
Set(ByVal value As String)
aMessage = value
End Set
End Property
End Class
End Namespace
You need to create a sequential workflow where the execution path can be generated on the fly by an
application.
Which XML code segment should you use?
A. <SequentialWorkflowActivity
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Litware="clr-namespace:LitwareActivities;assembly=LitwareActivities">
<Litware:WriteLineActivity Message="Hello, WF"/>
</SequentialWorkflowActivity>
B. <Workflow
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Litware="clr-namespace:LitwareActivities;assembly=LitwareActivities">
<Litware:WriteLineActivity Message="Hello, WF"/>
</Workflow>
C. <Workflow
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
class:Litware="clr-namespace:LitwareActivities;assembly=LitwareActivities">
<Litware:WriteLineActivity Message="Hello, WF"/>
</Workflow>
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D. <SequentialWorkflowActivity
class:Litware="clr-namespace:LitwareActivities;assembly=LitwareActivities">
<Litware:WriteLineActivity Message="Hello, WF"/>
</SequentialWorkflowActivity>
Answer: A

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