What are interfaces, what is the use them in project?

Category: ASP.NET
15 Feb 2016 07:16
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What are interfaces, what is the use them in project?
Dear Friends
I would like implement project with c# interface , but i never try interface in my previous project..

can any one suggest me to how to write the code using interface and how to call that interface in front end..
#764604
15 Feb 2016 09:47
Joined: 12/02/2013
Level: Gold
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Points: 4
Hi navaneethakrishnan.

Interface is nothing but a template or class. Which contains the abstract methods which are public abstract by default with in the interface. The implementation of abstract methods are provided in the derived classes.
to understand the use of interfaces you must know about abstract classes.
Multiple inheritance is achieved using the interfaces.

As per your question we are not going to call interface, we call the interface methods by creating the reference not object. As we can't create object for an interface.

Interface contain only abstract methods, which are public abstract by default.
1.Interface can implement another interface but cannot implement abstract class.
2.Object cannot be created for interface, reference can be created.

public interface ISample:IMysample
{
void mymethod();
void mymethod2();
}

Refer below two links which gives you clear idea of abstract class and interface.

http://www.dotnetspider.com/forum/332773-Abstract-Class-and-InterFace.aspx

http://www.dotnetspider.com/forum/13184-OOPS-Why-we-need-an-Interface.aspx
Sridhar Thota.
Editor: DNS Forum.
#764605
15 Feb 2016 10:01
Joined: 13/06/2007
Level: Gold
Points: 20603

Points: 4
Interface are alternative to multiple inheritance, Interfaces are declared using the interface keyword. It is similar to class declaration. Interface statements are public by default.
see below sample
public interface ITransactions
{
// interface members
void showTransaction();
double getAmount();
}
An interface looks like a class, but has no implementation. The only thing it contains are declarations of events, indexers, methods and/or properties. The reason interfaces only provide declarations is because they are inherited by structs and classes, that must provide an implementation for each interface member declared.
check below links for more detail
http://www.tutorialspoint.com/csharp/csharp_interfaces.htm
http://www.c-sharpcorner.com/UploadFile/sekarbalag/interface-best-example-in-csharp/
Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]
#764655
17 Feb 2016 10:05
Joined: 12/11/2009
Level: Gold
Points: 43848

Points: 2
Here you go for complete details about interface:
http://www.advancesharp.com/blog/1094/interface-in-c-with-real-time-example
http://www.dotnet-tricks.com/Tutorial/csharp/5T27291013-A-Deep-Dive-into-C

Regards,
Asheej T K
Microsoft MVP[ASP.NET/IIS]
DotNetSpider MVM
#764660
18 Feb 2016 01:51
Joined: 13/07/2011
Level: Gold
Points: 4261
Points: 4
Hi Naveen

Refer to the below..
In an interface class, all methods are abstract (undefined)- there is no implementation so when we create an interface, we are creating a set of methods, properties without any implementation and it must be overridden by the implemented classes. The benefit is that it allows a class to be a part of two classes: one from inheritance hierarchy and one from the interface.

For this,can't contain constructors and destructors.

Ex:

public interface Iget
{ void get();
}
public class get : Iget
{
public void get()
{ Console.WriteLine("example for interface");
}
}

Hope this will help you
Regards,
SonyShiva
Never lose hope..You never know what tomorrow will bring

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What are interfaces, what is the use them in project?

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