TAILIEUCHUNG - Apress Expert C sharp 2005 (Phần 2)

Tham khảo tài liệu 'apress expert c sharp 2005 (phần 2)', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2 27 06 12 44 PM Page 24 24 CHAPTER 1 DISTRIBUTED ARCHITECTURE public class Project private Guid _id private string _name public Guid Id get return _id public string Name get return _name set if value null value if 50 throw new Exception Name too long _name value This defines a business object that represents a project of some sort. All that is known at the moment is that these projects have an ID value and a name. Notice though that the fields containing this data are private you don t want the users of your object to be able to alter or access them directly. If they were public the values could be changed without the object s knowledge or permission. The _name field could be given a value that s longer than the maximum of 50 characters for example. The properties on the other hand are public. They provide a controlled access point to the object. The Id property is read-only so the users of the object can t change it. The Name property allows its value to be changed but enforces a business rule by ensuring that the length of the new value doesn t exceed 50 characters. Note None of these concepts are unique to business objects they re common to all objects and are central to object-oriented design and programming. Mobile Objects Unfortunately directly applying the kind of object-oriented design and programming I ve been talking about so far is often quite difficult in today s complex computing environments. Object-oriented programs are almost always designed with the assumption that all the objects in an application can interact with each other with no performance penalty. This is true when all the objects are running in the same process on the same computer but it s not at all true when the objects might be running in different processes or even on different computers. 2 27 06 12 44 PM Page 25 CHAPTER 1 DISTRIBUTED ARCHITECTURE 25 Earlier in this chapter I discussed various .

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