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In the previous examples, you may have noticed the use of BeginInvoke. Since an emulator runs in a different thread than the GUI, you need to synchronize cross-thread data access. In the first case (Listing 13-2), when the button is clicked, an emulator component (a GPIO input port) in the emulator thread is changed from the GUI thread. The code for changing the GPIO port must be executed, therefore, in the context of the emulator thread. You achieve this by calling the BeginInvoke method of the emulator component, as demonstrated with the code snippet in Listing 13-6. Listing 13-6. Synchronizing the Emulator and GUI Thread When Accessing Emulator Components this.gpioInPort.BeginInvoke(new MethodInvoker(delegate { this.gpioInPort.Write(true); } ) ); In the second case (Listing 13-4), a control on the user interface of the emulator is updated whenever the GPIO output port in the emulator thread changes. Any updates to the control to indicate the status must take place, therefore, in the context of the GUI thread. You also achieve this by calling the BeginInvoke method (see Listing 13-7) of the WinForms control. Listing 13-7. Synchronization of the Emulator and GUI Thread When Updating GUI Controls BeginInvoke(new MethodInvoker(delegate { this.gpioOutCheckBox.Checked = edge; })); The signatures of the BeginInvoke method overloads for the emulator components are identical to the WinForms controls. In both prior examples, anonymous methods were used. MethodInvoker is already defined in the System.Windows.Forms namespace. In the first example, the following instruction was used: this.gpioInPort.BeginInvoke(new MethodInvoker(delegate { this.gpioInPort.Write(true); } ) ); You can also specify the Write method directly: this.gpioInPort.BeginInvoke(new PortWriteDelegate(this.gpioInPort.Write), new object[] { true }); but, when specifying the method directly, an additional delegate is needed: private delegate void PortWriteDelegate(bool state);

Note In Spring Web Flow, the name for a conversation is flow. We will use the two words interchangeably

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In my opinion, anonymous methods are easier to read, more type safe, more extensible, and require fewer extraneous delegate declarations than using the method directly with additional delegates and untyped arguments with the BeginInvoke call. In all the examples so far, the actual operation was enclosed within a BeginInvoke method. Both emulator components and controls provide the following methods and properties concerning synchronization: IAsyncResult BeginInvoke(Delegate method) IAsyncResult BeginInvoke(Delegate method, params object[] args) object EndInvoke(IAsyncResult asyncResult) object Invoke(Delegate method) object Invoke(Delegate method, params object[] args) bool InvokeRequired { get; } With BeginInvoke, the calling thread is not blocked, because the task to process is placed in the queue of the target thread. You need to call EndInvoke only if you need to evaluate a return value. With Invoke, the calling thread is blocked until the task was processed. In addition, this method can provide a return value. With the InvokeRequired property, you can determine whether synchronization is necessary or whether you re already operating in the context of the correct threads.

Since this type is not declared in the namespace System, this type declaration itself does not cause a naming conflict However, after this COM interface is declared, several other declarations depend on the type name IServiceProvider For example, there are methods using the type IServiceProvider in their signature Since the type name IServiceProvider is ambiguous in this case, the compiler complains Even though these compiler errors look very irritating, it is easy to solve the problem Just write the using declaration after including windowsh, as follows: // noNameingTroublecpp // compile with "cl /c /clr noNamingTroublecpp" #include <windowsh> using namespace System; Since the namespace is opened later in this sample, none of the declarations in windowsh causes naming conflicts To minimize the potential for naming conflicts, it can be useful to reduce the number of names that are visible without namespace qualifiers.

This means for any nontrivial web application, request scope is too fine grained and session scope is not fine grained enough. Why not store everything in the session and manually perform cleanups when the conversation ends To begin, there are many well-documented issues associated with storing context within the session, including (but not limited to): Server affinity. If your application is to be deployed into a clustered environment, then your clients will suffer from server affinity. This occurs because a user s session is unique to each server, so if a user connects to another server, he will receive a whole new session. Server affinity prevents failover (http://en.wikipedia.org/wiki/Failover), thus reducing your ability to load balance within a cluster.

If you assign a pin number greater than 127 (or 49 with SDK 2.0) to a GPIO port, the emulator outputs an error message: < xml version="1.0" encoding="utf-8" > <Emulator> <Types> <GpioPort>Microsoft.SPOT.Emulator.Gpio.GpioPort</GpioPort> </Types> <EmulatorComponents> <GpioPort id="GPIOOut"> <Pin>150</Pin> <ModesAllowed>OutputPort</ModesAllowed> <ModesExpected>OutputPort</ModesExpected> </GpioPort> </EmulatorComponents> </Emulator> You can solve this issue with configuration of the GpioCollection class. The GpioCollection class is a component collection that holds and manages emulator components of the GpioPort type. It inherits from ComponentCollection and is shown in Listing 13-8.

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