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Constructors can also be declared static. While an instance constructor initializes each new instance of a class, a static constructor initializes items at the class level. Generally, static constructors initialize the static fields of the class. Class level items need to be initialized Before any static member is referenced Before any instance of the class is created Like instance constructors The name of the static constructor must be the same as the name of the class. The constructor cannot return a value. Unlike instance constructors Static constructors use the static keyword in the declaration. There can only be a single static constructor for a class, and it cannot have parameters. Static constructors cannot have accessibility modifiers. The following is an example of a static constructor. Notice that its form is the same as that of an instance constructor, but with the addition of the static keyword. class Class1 { static Class1 () { ... } ...

The first thing to notice is that we caught the base Exception type, having just said that we almost never do that. We want to log every exception, and because we re rethrowing rather than eating it, we won t simply ignore exceptions we weren t expecting. After we execute our handler code (just writing the message to the console in this case), we use the throw keyword, without any object, to rethrow the exception we just caught. If you compile and run that, you ll see the following output:

This code assigns a constructor to the Pet property of the Samples object. The Samples object defines a new scope and can be seen as the containing namespace for the Pet constructor. You ve assigned the constructor to the namespaced variable Samples.Pet. By turning the constructor into a client class, the name of the namespaced variable that holds the constructor becomes the fully qualified name of the class. The Microsoft Ajax Library leverages the same pattern to simulate namespaces. The only difference is that you can take advantage of the Type.registerNamespace method to create a namespace automatically:

Arthur is at (0,0) and is pointing at angle 0.00 radians. Arthur is at (0,10) and is pointing at angle 0.00 radians. Log error: The PlatformWidth must be initialized to a value > 0.0 Error running turtle: The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block

Notice that we get the output from both of the exception handlers. That s not the only way to throw from a catch block: it is perfectly reasonable to throw any exception from our exception handler! We often do this to wrap up an exception that comes from our implementation in another exception type that is more appropriate for our context. The original exception is not thrown away, but stashed away in the InnerException property of the new one, as shown in Example 6-18.

// Run the turtle for the specified duration public void RunFor(double duration) { try { if (LeftMotorState == MotorState.Stopped && RightMotorState == MotorState.Stopped) { // If we are at a full stop, nothing will happen return; } // The motors are both // then we just drive if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Drive(duration); } running in the same direction MotorState.Running && MotorState.Running) || MotorState.Reversed && MotorState.Reversed))

The program is not compiled to native machine code until it is called to run. At run time, the CLR performs the following steps (as shown in Figure 1-4): It checks the assembly s security characteristics. It allocates space in memory. It sends the assembly s executable code to the Just-In-Time (JIT) compiler, which compiles portions of it to native code. The executable code in the assembly is compiled by the JIT compiler as it is needed, and cached in case it is called again later in the program. That way, the code only has to be compiled to native code once. Code that is not called is not compiled to native code.

// The motors are running in opposite directions, // so we don't move, we just rotate about the // center of the rig

if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Rotate(duration);

MotorState.Running && MotorState.Reversed) || MotorState.Reversed && MotorState.Running))

}

Figure 1-4. Compilation to native code occurs at run time Once the CIL is compiled to native code, the CLR manages it as it runs, performing such tasks as releasing orphaned memory, checking array bounds, checking parameter types, and managing exceptions. For this reason Code written for the .NET Framework is called managed code, and needs the CLR. Code that does not require the CLR is called unmanaged code. Microsoft also supplies a tool called the Native Image Generator, or Ngen, which takes an assembly and produces native code for the processor.

} } catch (InvalidOperationException iox) { throw new Exception("Some problem with the turtle...", iox); } catch (Exception ex) { // Log here Console.WriteLine("Log message: " + ex.Message); // Rethrow throw; }

Type.registerNamespace('Samples');

Notice how we passed the exception to be wrapped as a parameter to the new exception when we constructed it. Let s make a quick modification to the exception handler in Main to take advantage of this new feature (see Example 6-19).

static void Main(string[] args) { Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 }; ShowPosition(arthurTheTurtle); try {

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