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The default constructor is one that has no parameters. If you don t specify a constructor in your class, the C# compiler will add a default constructor automatically when you compile your project. The constructor that is added will have no parameters and no code statements. I have been relying on this automatically added constructor so far in this book to keep the code samples simple. Here is a class that doesn t contain a constructor: class Person { public string Name { get; set; } public int Age { get; set; } public string City { get; set; } } When we compile this class, the C# compiler adds a default constructor for us, meaning that the previous class is equivalent to this one: class Person { public string Name { get; set; } public int Age { get; set; } public string City { get; set; } public Person() { } } You create instances of a class with the default constructor in the same way, even if the C# compiler has created it for you, by using the new keyword and the name of the class. Because the constructor has no parameters, we use the open and close parentheses, like this:

Person p = new Person();

The automatic creation of the default constructor reduces code clutter in classes that don t require initialization. There are times when you will want to explicitly define the default constructor. The most obvious is that you want to include code statements to initialize your class, most often to assign initial values to properties and fields. You will also want to explicitly add the default constructor to change the access modifier (default constructors are always created with the public modifier) or control which constructor is called in the base class (see the Calling Base Class Constructors section).

The second angle is that, in addition to each line of code being explicitly security conscious, certain explicit security features should be implemented depending upon the functional requirements of the software In addition, design documents should contain some specification of how the goals in the requirements are achieved..

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Clicking the Unlock button in the message allows you to unlock the content so that you can edit it (e.g., if you realize the other user is not really working on it or the message says that the item was locked several days ago).

// upcast to the base interfaces and call the method that each defines IProductCalculator prodCalc = calc; int prodResult = prodCalc.CalculateProduct(10, 10); ISumCalculator sumCalc = calc; int calcResult = sumCalc.CalculateSum(10, 10); ISubtractionCalculator subCalc = calc; int subResult = subCalc.CalculateSubtraction(10, 2); You can also explicitly cast from one base interface to another (but only if you are sure that the object you are casting implements both interfaces), like this: // explicitly cast from one base interface to another prodCalc = (IProductCalculator)subCalc;

Interfaces can be modified with the partial keyword and defined in several places. Just as with partial classes (discussed in 6), the compiler will combine the partial elements to create a unified interface definition. Member specifications must be unique across all the parts of a partial interface. Listing 12-9 demonstrates a partial interface. Listing 12-9. Defining a Partial Interface partial interface ICalculator { int CalculateProduct(int x, int y); } partial interface ICalculator { int CalculateSum(int x, int y); } The two parts of this partial interface are defined in the same code file to make a convenient example, but normally they would be in separate code files. Each part of the partial interface must be defined with the partial keyword and must have the same fully qualified name (see 11 for details of namespaces and fully qualified names).

Classes can implement an interface in addition to being derived from a base class. Listing 12-10 contains an example. Listing 12-10. Deriving from a Base Class and Implementing an Interface interface ICalculator { int CalculateSum(int x, int y); }

You ve already seen how to add content to your site and organize it, but we still have to discuss some important features of Plone, such as publishing your content, restricting types in a folder, applying different views to a folder, and using the versioning features. We ll also discuss another characteristic that makes Plone a very powerful tool: the possibility of managing a web site in collaboration with one or more other users. You can share the permission to see/edit/review/publish content in different parts of the site with just one user you trust, with a group of contributors that have specific skills, or with all the members of the site. For example, you can manage the Event section with your friend, the Products folder with the suppliers of your business activity, and so on. In other words, you can take advantage of the collaboration of how many users you want, but you are the one who chooses which contents to share with who, and which tasks they can perform. But before you learn how to share your content, you need to know how Plone manages the visibility of objects, so let s start talking about the publication states.

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