How do you apply Single Responsibility principle to a repository

Question

I am trying to apply "SOLID" whenever I can and try to use common sense and avoid a pattern when I see that a pattern is creating more problems than it's trying to solve. I don't want to apply a pattern and make life difficult for somebody else using
my code just for the sake "I write patterns" if you see what I mean.
Now I am struggling with one of the principles that I thought was the easiest to grasp: "SRP".
How do you practically apply this principle to repositories?
Let's suppose I have a
IEmployeeRepository
IUserRepository
IProductRepository
and commonly they will have methods like these:
public interface IUserRepository
User GetUser(int id);
IEnumerable<User> GetAllUser();
void DeleteUser(int id);
same for employees and products.
Are we saying that each of these method should be a class on it's own? even though at times we are talking a single line of code?

Answer 1

Hello,
"Are we saying that each of these method should be a class on it's own? even though at times we are talking a single line of code?"
interface is not a method. It has its own definition and you can refer to here:
http://msdn.microsoft.com/en-us/library/87d83y5b.aspx
Any from your question I think you may still confused about the usage of interface. In this way, I will recommend you have a look at the following blog:
http://www.codeproject.com/Articles/18743/Interfaces-in-C-For-Beginners
"Interfaces in C # provide a way to achieve runtime polymorphism. Using interfaces we can invoke functions from different classes through the same Interface reference, whereas using virtual functions we can invoke functions from different classes in
the same inheritance hierarchy through the same reference"
With the blog you can check that code to see details about how to use interface.
Best regards,
Barry
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