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Figure 4-4. Workflow with Delay and Suspend activities Add a breakpoint to the Delay1 activity and debug the workflow. You ll notice the Delay1 activity is executed, and the workflow pauses for 30 seconds. Then the left branch of the IfElse activity is executed, because that s the branch whose condition is True. Finally, the SuspendError activity is executed. However, notice that nothing happens. The console application remains open, and so does the workflow. The Suspend activity paused the workflow; however, the workflow doesn t know what to do when it s suspended. A little more coding is involved to make the Suspend activity work, so stop the debugging of the workflow. Open the Module1.vb file to open the code for the console application. Find the line of code that creates a new instance of the WorkflowRuntime class: Dim workflowRuntime As New WorkflowRuntime()) Right-click WorkflowRuntime() and choose Go To Definition to open the Object Browser. This takes you to the object model for the WorkflowRuntime class. If you scroll down the right side of the Object Browser, you ll see events such as WofkflowStarted, WorkflowSuspended, and WorkflowTerminated. These are all events that can be raised within the WorkflowRuntime class. Now you need to add code to Module1 to handle the WorkflowSuspended event, so when the event is raised the workflow runtime will know what actions to perform. Add the following sub to handle the WorkflowSuspended event: Shared Sub OnWorkflowSuspended(ByVal sender As Object, ByVal e As WorkflowSuspendedEventArgs) Msgbox(e.Error) WaitHandle.Set() End Sub

A class can have more than one indexer, as long as the parameter lists are different. It is not sufficient for the indexer type to be different. This is called indexer overloading, because all the indexers have the same name the this access reference. For example, the following class has three indexers: two of type string, and one of type int. Of the two indexers of type string, one has a single int parameter and the other has two int parameters. class MyClass { public string this [ int index ] { get { ... } set { ... } } public string this [ int index1, int index2 ] { get { ... } set { ... } } public int this [ float index1 ] { get { ... } set { ... } } ... }

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Note You can find the oscillator component in the OscillatorComponent component library project. Also an emulator configured for using this component can be found in the OscillatorSampleEmulator project. The library assembly with the component must be either in the same directory as the emulator or in the GAC.

short[] cubeLineIndices = { 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 };

using System; class Listing 08 { static void Main(string[] args) { int x = 0; do { // write out a message Console.WriteLine("Iteration for value: {0}", x); // increment the local variable x++; } while (x < 5); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Figure 4-19 shows the do...while loop in Listing 4-8.

The class constructors are executed before any members (static or instance) of the classes are accessed. Normally, it means that a .cctor is executed right before first access to a static member of the class or before the first class instantiation, whichever comes first. However, if the class has the beforefieldinit flag set (see 7), the invocation of .cctor happens on relaxed (as it is called in the Ecma International/ISO standard) schedule the .cctor is supposed to be called any time, at CLR discretion, prior to the first access to a static field of the class. In fact, the .cctor invocation schedule in presence of the beforefieldinit flag is anything but relaxed : the .cctor is invoked right when the class is referenced, even if no members of the class are ever accessed. Take a look at the following code (sample Cctors.il on the Apress Web site): .assembly extern mscorlib { auto } .assembly cctors {} .module cctors.exe .typedef [mscorlib]System.Console as TTY #define DEFLT_CTOR ".method public specialname void .ctor() {ldarg.0; call instance void .base::.ctor(); ret;}" .class public Base { DEFLT_CTOR .method public void DoSomething() { ldarg.0 pop ldstr "Base::DoSomething()" call void TTY::WriteLine(string) ret } } .class public /*beforefieldinit*/ A extends Base {

At this point, we re a third of the way through implementing n-level undo support. It is now possible to create a stack of snapshots of an object s data. It is time to move on and discuss the undo and accept operations.

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