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Exam : Microsoft 70-504CSharp
Title : TS: Microsoft .NET Framework 3.5 -C Windows Workflow Foundation


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 void codeActivity_ExecuteCode(object sender, EventArgs e)
{
CodeActivity delay = sender as CodeActivity;
Console.WriteLine(delay.Name);
WorkflowChanges workflowChanges = new WorkflowChanges(this);
CodeActivity codeActivity = new CodeActivity();
codeActivity.Name = "codeActivity2";
codeActivity.ExecuteCode += new EventHandler(codeActivity2_ExecuteCode);
workflowChanges.TransientWorkflow.Activities.Add(codeActivity);
this.ApplyWorkflowChanges(workflowChanges);
}
private void codeActivity2_ExecuteCode(object sender, EventArgs e)
{
CodeActivity codeActivity = sender as CodeActivity;
Console.WriteLine(codeActivity.Name);
Console.ReadLine();
}
You also have set the modifiability of the workflow to a code condition that is set to the following function:
private void UpdateCondition(object sender, ConditionalEventArgs e)
{
if (TimeSpan.Compare(this.delayActivity.TimeoutDuration, new TimeSpan(0, 0, 5)) > 0) {
e.Result = false;
}
else {
e.Result = true;
}
}
Which code segment should you use to handle the exception?
A. workflowChanges.TransientWorkflow.Activities.Add(codeActivity);
try {
this.ApplyWorkflowChanges(workflowChanges);
}
catch (ArgumentOutOfRangeException ex) {
Console.WriteLine(ex.GetType().ToString());
Console.ReadLine();
}
B. workflowChanges.TransientWorkflow.Activities.Add(codeActivity);
try {
this.ApplyWorkflowChanges(workflowChanges);
}
catch (InvalidProgramException ex) {
Console.WriteLine(ex.GetType().ToString());
Console.ReadLine();
}
C. workflowChanges.TransientWorkflow.Activities.Add(codeActivity);
try {
this.ApplyWorkflowChanges(workflowChanges);
}
catch (InvalidOperationException ex) {
Console.WriteLine(ex.GetType().ToString());
Console.ReadLine();
}
D. workflowChanges.TransientWorkflow.Activities.Add(codeActivity);
try {
this.ApplyWorkflowChanges(workflowChanges);
}
catch (OverflowException ex) {
Console.WriteLine(ex.GetType().ToString());
Console.ReadLine();
}
Answer: C

2. You create an application in which users design simple sequential workflows. The designs are stored as XOML in a SQL database. You need to start one of these sequential workflows from within your own workflow.
What should you do?
A. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of the WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the workflowType parameter.
B. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the XmlReader and workflowDefinitionReader parameters.
C. Include a custom activity with a code segment that includes an invocation to the CreateWorkflow method of the WorkflowRuntime class and then starts the workflow. The signature of the CreateWorkflow method invoked uses only the workflowType, Dictionary<string,Object> namedArgumentValues, and Guid instanceId parameters.
D. Include and configure an InvokeWorkflow activity
Answer: B

3. You create a Windows Workflow Foundation application by using Microsoft .NET Framework 3. You use the state machine workflow in the application.
You plan to implement a mechanism that allows a host application to query a state machine workflow instance that is currently executing.
You write the following code segment. (Line numbers are included for reference only.)
01 WorkflowRuntime runtime = new WorkflowRuntime();
02 WorkflowInstance instance =
03 runtime.CreateWorkflow(typeof(Workflow1));
04 instance.Start();
05
You need to identify the current state of the workflow.
Which code segment should you insert at line 05?
A. string currentstate = instance.GetWorkflowDefinition().ToString();
B. string currentstate = instance.GetWorkflowDefinition().ExecutionStatus.ToString();
C. StateMachineWorkflowInstance smwi = new StateMachineWorkflowInstance(runtime, instance.InstanceId);
string currentstate = smwi.StateHistory[0];
D. StateMachineWorkflowInstance smwi = new StateMachineWorkflowInstance(runtime, instance.InstanceId);
string currentstate = smwi.CurrentStateName;
Answer: D

4. A windows application invokes a workflow that performs complex calculations. When the calculation is done, the workflow returns the calculated value to the windows application, which must display the calculated value in a textbox control, as follows:
public void ShowData(string value)
{
mytextBox.Text = value
}
You need to ensure the workflow updates the value in the textbox control.
What should you do?
A. Have the workflow directly call the ShowData() method.
B. Have the workflow call a method in an interface decorated with an
[ExternalDataExchange()] attribute that invokes the ShowData() method directly
C. Set the workflow to call a method in an interface decorated with an [ExternalDataEventArg()] attribute that invokes the ShowData() method directly
D. Set the workflow to call a method in a interface decorated with an [ExternalDataExchange()] attribute that invokes the ShowData() method indirectly through a delegate if the this.InvokeRequired condition is true.
Answer: D

5. You use a built-in tracking service to track specific workflow parameters.
You need to check whether the workflow parameters have been stored in the tracking database.
What should you do? (Each correct answer presents part of a solution. Choose two.)
A. Display the contents of the WorkflowInstance table of the tracking database.
B. Include the SqlTrackingQuery class in a code segment to retrieve tracked workflows and SqlTrackingWorkflowInstance class to inspect them.
C. Use the ActivityTrackingLocation class to determine if the value has been set to a database.
D. Display the contents of the TrackingDataItem table of the tracking database.
Answer: BD