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Using Interface and interface members in C#

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nccsbim071 nccsbim071 is offline

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Using Interface and interface members in C#

Nov 8th, 2009

What is the difference between following declarations:

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
WebUserService.Service.IUserService userService = new WebUserService.Service.UserService();
WebUserService.Service.UserService userService = new WebUserService.Service.UserService();
WebUserService.Service.IUserService userService = new WebUserService.Service.UserService();
WebUserService.Service.UserService userService = new WebUserService.Service.UserService();

I want to know the difference in usage and the the one that is most efficient in terms of programming in C#.

Last edited by nccsbim071; Nov 8th, 2009 at 2:33 am.

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sknake

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Nov 8th, 2009

The only difference is that you are holding on to a reference of the interface versus the class. The class implements more functionality than the interface but you can also cast the interface reference to the class and still call any method. As far as efficiency there is no difference. Both lines are instantiating a UserService .

Scott Knake
Custom Software Development
Apex Software, Inc.