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The ReadOnlyBase class will provide a base on which business developers can build a read-only object. The chapter will conclude with the ReadOnlyListBase that supports read-only collections of data. By definition, a read-only object is quite simple: it s just a container for data, possibly with authorization or formatting logic to control how that data is accessed. It doesn t support editing of the data, so there s no need for n-level undo, change events, or much of the other complexity built into UndoableBase and BusinessBase. In fact, other than data access logic, the base class can only implement the CanReadProperty() authorization methods and the ICloneable interface. Like all base classes, this one is serializable and abstract. It will also implement Csla.Core. IBusinessObject to provide some level of polymorphic behavior even though this is a generic class: [Serializable()] public abstract class ReadOnlyBase<T> : ICloneable, Core.IBusinessObject where T : ReadOnlyBase<T> Like Csla.BusinessBase, the generic type T is constrained to be the type of business object being created, so a business class is declared like this: [Serializable()] public class DefaultCustomerData : Csla.ReadOnlyBase<DefaultCustomerData> { } Like all good objects, it should override the core System.Object methods just like BusinessBase<T>. To do this, the class defines a GetIdValue() method and uses its result to implement Equals(), GetHashCode(), and ToString() in exactly the same manner as BusinessBase<T> did earlier. Presumably, any business object based on this class would consist entirely of read-only properties or methods that just return values. 4 will add data access functionality to this class, supporting only the reading of data from the database, with no update possible. Let s walk though the implementation of authorization rules and the ICloneable interface.

Seeing as there is an insertBefore method, you might expect to be able to use a corresponding insertAfter method. Unfortunately, no such DOM method exists.

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The authorization rules behavior in ReadOnlyBase is virtually identical to that in BusinessBase, with the exception that only read operations need to be checked. Since the intent is to create a read-only object, there s no reason to support checking authorization rules for writing to a property. An AuthorizationRules object will be used to manage the roles for each property: [NotUndoable()] private Security.AuthorizationRules _authorizationRules = new Security.AuthorizationRules(); protected Security.AuthorizationRules AuthorizationRules { get { return _authorizationRules; } } Then the same CanReadProperty() methods are implemented as in BusinessBase. I won t repeat them here, as they are literally the exact same code: three different overloads of the method to support different scenarios. And the primary implementation is a virtual method, allowing a business developer to alter the authorization behavior if needed.

The thread responsible for the set computation executes the following function: let run let let let let let let filler (form:#Form) (bitmap:Bitmap) (tlx, tly) (brx, bry) = dx = (brx - tlx) / float bmpw dy = (tly - bry) / float bmph maxit = iterations (tlx, tly) (brx, bry) x = 0 y = 0 transform x y = ComplexCreate (tlx + (float x) * dx, tly - (float y) * dy ) formInvoke(new MethodInvoker(fun () -> formText <- sprintf "Mandelbrot set [it: %d] (%f, %f) -> (%f, %f)" maxit tlx tly brx bry )) |> ignore filler maxit transform timerEnabled <- false.

The ICloneable interface is implemented as well. The Clone() method for the interface itself is accessible only via the interface. There s also a public strongly typed method that returns an object of type T. Both of these methods delegate to a virtual method named GetClone(), which in turn delegates to Csla.Core.ObjectCloner to do the actual work. Again, this is the same code as in BusinessBase and BusinessListBase, so I won t repeat it here. This completes the ReadOnlyBase class. The chapter will wrap up by covering ReadOnlyListBase.

You use dx and dy variables to map the x and y coordinates of the bitmap into the complex plane. You then invoke the filler function responsible for performing the calculation. There are different possible filling strategies to compute the colors of the set; the straightforward approach is left to right and top to bottom, implemented by the linearFill function:

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