why interfaces is important in oop

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hi foxes how are you
i always ask when and why i need to implement interfaces.
i am almost 2 years programming and i never felt like i need interface in my pattern
can some one please explain the important and benefits of it and practical cases that cant be handle without it or at least any references can help in that point
thanx

Posted 22-Aug-14 6:52am

seagaull

Updated 22-Aug-14 7:08am

PIEBALDconsult

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george4986 23-Aug-14 7:18am

consider u have an erp project on which u have added dlls for modules like hr,payroll,inventory,...so on. U can use interface class to pass(communicate) data(eg:user name,login company,location..fetched on login time) to forms in the dlls. Each forms u need to inherit the interface class ,set properties & constructor.From calling form create object of interface class and pass values(usually on calling time of each form).

2 solutions

Solution 1

See http://msdn.microsoft.com/en-gb/library/87d83y5b.aspx[^]. An interface is basically a contract, if you implement the interface you must provide all the elements (methods and properties) listed in the contract.

Posted 22-Aug-14 6:57am

Richard MacCutchan

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PIEBALDconsult · Accepted Answer · 2014-08-22T07:07:00

Solution 2

A simple search here on Code Project finds these and many more articles:

Why do we need Interfaces?[^]

Interfaces and its Importance[^]

Demystifying interfaces in C#[^]

Posted 22-Aug-14 7:07am

PIEBALDconsult