Question

Define an interface. Briefly describe the benefits of using interfaces

Answer 1

Answer on Question #50509, Programming, C#

Task:

Define an interface. Briefly describe the benefits of using interfaces

Answer:

An interface contains only the signatures of methods, properties, events or indexers. A class or struct that implements the interface must implement the members of the interface that are specified in the interface definition. In the following example, class ImplementationClass must implement a method named SampleMethod that has no parameters and returns void.

interface ISampleInterface
{
    void SampleMethod();
}
class ImplementationClass : ISampleInterface
{
    // Explicit interface member implementation:
    void ISampleInterface.SampleMethod()
    {
        // Method implementation.
    }
    static void Main()
    {
        // Declare an interface instance.
        ISampleInterface obj = new ImplementationClass();
        // Call the member.
        obj.SampleMethod();
    }
}

An interface can be a member of a namespace or a class and can contain signatures of the following members:

- Methods

- Properties

- Indexers

- Events

An interface can inherit from one or more base interfaces.

When a base type list contains a base class and interfaces, the base class must come first in the list. A class that implements an interface can explicitly implement members of that interface. An explicitly implemented member cannot be accessed through a class instance, but only through an instance of the interface.

Why Use Interfaces?

- To allow a class to inherit multiple behaviors from multiple interfaces.

- To avoid name ambiguity between the methods of the different classes

- To combine two or more interfaces such that a class need only implement the combined result.

- To allow Name hiding. Name hiding is the ability to hide an inherited member name from any code outside the derived class.

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