Why and when to use Interface?

Question

0.00/5 (No votes)

See more:

C#

Please guide me about interface, when to use interface and why we use interface?

Thanks

Posted 3-Jul-11 23:15pm

attiq_khan

Add a Solution

6 solutions

Solution 6

You got some reasonable answers. Please also see the useful discussion here:
When we use abstract and when we use interface...?[^],
Difference between abstract class and interface if they have same no of methods and var[^].

Please check out not just my answers, but all other posts. Some are interesting and useful.

—SA

Posted 4-Jul-11 10:52am

Sergey Alexandrovich Kryukov

Updated 4-Jul-11 10:53am

v2

Comments

Richard MacCutchan 5-Jul-11 5:37am

A 5 for your answer which points the way to lots of good information. I must read the article in the link I posted to see if it really explains the issues, as I see so many repeats of this question.

Sergey Alexandrovich Kryukov 5-Jul-11 5:45am

Thank you, Richard.
--SA

Solution 4

hi,

use interface are
1. Apply Common Standard Coding
2. Casting

Casting means we have an object that contain all the function and variable in it but we want only one function in that obejct then we create an interface and cast the object. in the case of remoting we don't know the type of object so we cast that object using our interface

Posted 4-Jul-11 0:10am

Aneesh M

Solution 5

Interfaces are used when you want to establish some contract. That is the common use case for the interfaces.

Posted 4-Jul-11 6:45am

Mohsan Raza Ali

Comments

Sergey Alexandrovich Kryukov 4-Jul-11 16:49pm

OK, pretty much correct, but why not an abstract class then? Also a contract?
--SA

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Accepted Answer · 2011-07-03T23:18:00

Solution 1

The first hit by Google is here[^] on CodeProject.

Posted 3-Jul-11 23:18pm

Richard MacCutchan

Comments

attiq_khan 4-Jul-11 5:25am

thanks alot

Sergey Alexandrovich Kryukov 4-Jul-11 16:53pm

Reasonable, my 5. Please see my answer, too.
--SA

Mario Majčica · Accepted Answer · 2011-07-03T23:19:00

Solution 2

Google is your friend! Start here Abstract Class versus Interface[^]

Cheers!

Posted 3-Jul-11 23:19pm

Mario Majčica

Comments

attiq_khan 4-Jul-11 5:25am

thanks alot

OriginalGriff · Accepted Answer · 2011-07-03T23:21:00

Solution 3

Google can help - your subject line used as a search term will take you to MSDN[^] and the start of a series of short articles on when and why to use interfaces.

Please, try to use google first - it can save you a lot of time...

Posted 3-Jul-11 23:21pm

OriginalGriff

Comments

attiq_khan 4-Jul-11 5:24am

thanks alot

OriginalGriff 4-Jul-11 5:32am

You're welcome!

Sergey Alexandrovich Kryukov 4-Jul-11 16:53pm

Reasonable, my 5.
Please see my answer, too.