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The .NET Framework frees the programmer from the COM legacy. As a C# programmer, you do not need to use COM, and therefore do not need any of the following: The IUnknown interface: In COM, all objects must implement interface IUnknown. In contrast, all .NET objects derive from a single class called object. Interface programming is still an important part of .NET, but it is no longer the central theme. Type libraries: In .NET, information about a program s types is kept together with the code in the program file, not in a separate type library the way it is in COM. Reference counting: The programmer no longer has to keep track of references to objects. In .NET, the GC keeps track of references and deletes objects when appropriate. HRESULT: The HRESULT data type used in COM to return runtime error codes is not used in .NET. Instead, all runtime errors produce exceptions. The registry: This system-wide database that holds information about the operating system and application configurations is not used when deploying .NET applications. This simplifies installation and removal of programs.

What happens if you have conflicting names Imagine the interface ISettable NamedPerson:

interface ISettableNamedPerson { string Name { get; set; } }

abstract class FirefighterBase : INamedPerson, ISettableNamedPerson, ISalariedPerson { // ... }

properties to the new object. The use of the new operator causes the constructor to implicitly return the newly created object. As result, the cat variable in the previous statement holds an object with two properties: _name and _age.

The answer is that everything is just fine! Each interface requires that we implement a string property called Name; one requires at least a getter, the other a getter and a setter.

Deploying programs written for the .NET Framework can be considerably easier than it was previously, for the following reasons: .NET programs do not need to be registered with the registry. In the simplest case, a program just needs to be copied to the target machine. Side-by-side execution allows different versions of a DLL to exist on the same machine. This means that every executable can have access to the version of the DLL for which it was built.

When we access the property through the relevant interface, it can resolve correctly which member we meant; there s no requirement for a separate implementation for each interface. But what if that was actually wrong What if our Name property on INamedPerson had entirely different semantics from the one on ISettableNamedPerson Let s suppose that one is intended to allow only letters and numbers with no spaces and the other is just our freeform any old text implementation with which we are familiar. Whenever our client expects an INamedPerson we need to provide the second implementation, and whenever the client expects an ISettableNamedPerson, the first. We can do that by explicitly implementing the interfaces.

To explicitly implement a particular member of an interface, you drop the accessibility modifier and add the interface name as a prefix, as shown in Example 4-24.

class AFootInBothCamps : INamedPerson, ISettableNamedPerson { private string settableName; string INamedPerson.Name { get { Console.WriteLine("Accessed through the INamedPerson interface"); return settableName; } } string ISettableNamedPerson.Name { get { return settableName; } set { Console.WriteLine( "Accessed through the " + "ISettableNamedPerson interface"); if( settableName != null && settableName.Contains(" ") ) { // You can't set it if it contains the space // character return; } settableName = value;

}

The CLR checks and ensures the type safety of parameters and other data objects even between components written in different programming languages.

}

}

class Program { static void Main(string[] args) { AFootInBothCamps both = new AFootInBothCamps(); ISettableNamedPerson settablePerson = both; INamedPerson namedPerson = both; settablePerson.Name = "hello"; Console.WriteLine(settablePerson.Name); Console.WriteLine(namedPerson.Name); } Console.ReadKey();

Often, some properties of an object are prefixed with an underscore as is the case with _name and _age to suggest that they should be considered private. However, this remains a naming convention only because properties of objects can t have a private scope. Despite what happens in Java or C#, where you can use the private modifier to prevent external objects from accessing a member of a class, in JavaScript the properties of an object are always publicly accessible. By using closures, you can treat local variables defined in a function as private members. But the convention offers a number of advantages, including the ability to inspect members from a debugger.

}

The .NET Framework supplies an extensive base class library, called, not surprisingly, the Base Class Library (BCL). It is also called the Framework Class Library. You can use this extensive set of available code when writing your own programs. Some of the categories of base classes provided are as follows: General base classes: Provide you with an extremely powerful set of tools for a wide range of programming tasks, such as string manipulation, security, and encryption Windows Forms classes: For building Windows GUI applications ASP.NET classes: For building web-based applications ADO.NET classes: For database manipulation

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