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.NET Forum / Languages / C# / April 2008returning interfaces
In some of the code I am looking at on a sample website, a lot of methods are returning interfaces such as IDataReader instead of a plain DataReader. Why would you want to do this? > In some of the code I am looking at on a sample website, a lot of > methods are returning interfaces such as IDataReader instead of a plain > DataReader. Why would you want to do this? > > *** Sent via Developersdex http://www.developersdex.com *** Because then the implementation can return an object that looks like a IDataReader and behaves the way it is supposed to, without actually having to inherit from DataReader. Interfaces are useful for making your own classes in your own class hierarchy pluggable into some other kind of class hierarchy which has nothing in common with yours.  SignatureLasse Vågsæther Karlsen mailto:lasse@vkarlsen.no http://presentationmode.blogspot.com/ PGP KeyID: 0xBCDEA2E3 > In some of the code I am looking at on a sample website, a lot of > methods are returning interfaces such as IDataReader instead of a plain > DataReader. Why would you want to do this? > > *** Sent via Developersdexhttp://www.developersdex.com*** Hi, Because you do not care about the actual type being returned, you do not care if it's a SqlDataReader or an OracleDataReader, the only thing you care about is that it implements the IDataReader interface. It separates the interface from the implementation. Here is a decent explanation.... http://bytes.com/forum/thread223924.html -Drew On Apr 17, 6:56 am, Mike P <mike.p...@gmail.com> wrote: > In some of the code I am looking at on a sample website, a lot of > methods are returning interfaces such as IDataReader instead of a plain > DataReader. Why would you want to do this? > > *** Sent via Developersdexhttp://www.developersdex.com*** Hi, Because you do not care about the actual type being returned, you do not care if it's a SqlDataReader or an OracleDataReader, the only thing you care about is that it implements the IDataReader interface. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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