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In this section, we ll concentrate on debugging runtime errors, as compile-time errors are usually fairly straightforward to solve. The C# compiler error messages are generally quite descriptive, and since they point to the exact line where the compiler encountered the error, it s usually relatively easy to get to the source of the problem and correct it. Runtime errors mostly derive from incorrect data held in a variable, so the single most useful debugging technique is to step through code one line at a time, to see the changing values of variables as the code executes. This is, of course, easy to do with VS, but it s also possible to a degree using only the tools that ship with the .NET Framework SDK.

They were made to look similar so that they could be as intuitive as possible, but they have some minor differences. For example, the IServiceBehavior interface doesn t have the ApplyClientBehavior. In addition, the ApplyDispatchBehavior has some different parameters in certain interfaces. This is why we replaced the specific names of the behaviors with ellipses (...). Please refer to the MSDN help to get more insight into all the behavior interfaces.

glLineWidth(2.0); glVertexPointer (2, GL_FLOAT , 0, vertices); glDrawArrays (GL_LINES, 0, 2);

Whenever we finish drawing in OpenGL ES, we have to tell it to render its buffer, and tell our view s context to show the newly rendered buffer:

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You can define the ServiceBehavior attribute at the service implementation (class) level to specify service-wide execution behavior. You cannot apply this attribute at the interface (contract) level. This distinction is important. The behaviors in WCF have to do with the internals of the implementation, not with the service contract. Listing 3 16 shows the interface of the IServiceBehavior interface that the ServiceBehavior attribute implements. Listing 3 16. IServiceBehavior Interface public interface IServiceBehavior { // Methods void AddBindingParameters(ServiceDescription description, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection parameters);

glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); [context presentRenderbuffer:GL_RENDERBUFFER_OES];

To clarify, the process of drawing in OpenGL consists of three steps. First, you draw in the context. Second, once all your drawing is done, you render the context into the buffer. And third, you present your render buffer, which is when the pixels actually get drawn onto the screen. As you can see, the OpenGL example is considerably longer. The difference between Quartz 2D and OpenGL ES becomes even more dramatic when we look at the process of drawing an ellipse. OpenGL ES doesn t know how to draw an ellipse. OpenGL, the big brother and predecessor to OpenGL ES, has a number of convenience functions for generating common two- and three-dimensional shapes, but those convenience functions are some of the functionality that was stripped out of OpenGL ES to make it more streamlined and suitable for use in embedded devices like the iPhone. As a result, a lot more responsibility falls into the developer s lap. As a reminder, here is how we drew the ellipse using Quartz 2D:

To debug a SQL assembly in VS, you need to create a SQL Server project it s not possible to attach the debugger to the sqlsrver.exe process and debug a DLL that way.

void ApplyDispatchBehavior(ServiceDescription description, ServiceHostBase serviceHostBase); void Validate(ServiceDescription description, ServiceHostBase serviceHostBase); } As you can gather, the most important method in the IServiceBehavior interface is ApplyDispatchBehavior, which comes with two parameters The ServiceDescription is mainly provided to inspect the entire service description However, in practice you could also modify the service and its description, although you wouldn t typically do that at this level Validate is called in order for you to be able to validate the endpoint WCF will automatically call it for you ServiceHostBase provides the ChannelDispatchers collection to inject code into the dispatcher pipeline and affect the dispatching behaviors This is basically where the translation is made between the NET objects and the actual sockets underneath the transport Through the AddBindingParameters method and the provided BindingParameterCollection, you can pass information about the contract to the channel stack to implement concepts such as security and transactions.

CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(context, 2.0); CGContextSetStrokeColorWithColor(context, currentColor.CGColor); CGContextSetFillColorWithColor(context, currentColor.CGColor); CGRect currentRect; CGContextAddEllipseInRect(context, self.currentRect); CGContextDrawPath(context, kCGPathFillStroke);

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