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Nov 8th, 2009

Using Interface and interface members in C#

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What is the difference between following declarations:

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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nccsbim071

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Nov 8th, 2009

Re: Using Interface and interface members in C#

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 .

sknake

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Nov 9th, 2009

Re: Using Interface and interface members in C#

thanks sknake

nccsbim071

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