C# Interface Different Variable Types in Repository Methods

Question

I would like to implement a interface and repository pattern. My different repositories can have type data types,

First one is (String-int, char-long)

Second one is (Char-double, double-string). Pattern keeps going, we have around 50 different methods.We are changing our interface/repositories to another database system, etc.

How would I edit the edit the interface below, to allow different data types? Thanks,

public interface ITransactionRepository
{
    void SearchTransactionbyCategoryCustomerId(Category, CustomerId ); // what should I write here?
    void SearchTransactionbyProductDepartment(Product, Department); 
    ......
}


public class TransactionRepository1: IRepository
{
    void SearchTransactionbyCategoryCustomerId(string Category, int CustomerId);
    void SearchTransactionbyProductDepartment(char Product, long Department); 
    ......
}

public class TransactionRepository2: IRepository
{
    void SearchTransactionbyCategoryCustomerId(char Category, double CustomerId);
    void SearchTransactionbyProductDepartment(double Product, string Department); 
    ......
}

Think about it for a moment. Let's imagine you could do where T: string, char (which you cannot), how would those methods look like? if T is string...? — Camilo Terevinto
– Camilo Terevinto, Commented May 30, 2018 at 0:22
Surely this isn't a representation of your actual system though...? Can you post something that more closely resembles what you're working with? — Evan Trimboli
– Evan Trimboli, Commented May 30, 2018 at 0:26
Should IRepository really be ITransactionRepository or is something missing? — ChiefTwoPencils
– ChiefTwoPencils, Commented May 30, 2018 at 0:54
I'm curious why you would represent the same thing (Product) with Products, chars, and doubles. Couldn't you standardize that rather than worry about all the combinations? — ChiefTwoPencils
– ChiefTwoPencils, Commented May 30, 2018 at 0:55

ChiefTwoPencils · Accepted Answer · 2018-05-30 01:20:37Z

1

Define your interface as generic and specify the actual types in the implementation,

public interface ITransactionRepository<TCategory, TCustomerId, TProduct, TDepartment>
{
    void SearchTransactionbyCategoryCustomerId(TCategory Category, TCustomerId CustomerId );
    void SearchTransactionbyProductDepartment(TProduct Product, TDepartment Department); 
    ......
}


public class TransactionRepository1: ITransactionRepository<string, int, char, long>
{
    void SearchTransactionbyCategoryCustomerId(string Category, int CustomerId);
    void SearchTransactionbyProductDepartment(char Product, long Department); 
    ......
}

public class TransactionRepository2: ITransactionRepository<char, double, double, string>
{
    void SearchTransactionbyCategoryCustomerId(char Category, double CustomerId);
    void SearchTransactionbyProductDepartment(double Product, string Department); 
    ......
}

edited May 30, 2018 at 1:20

ChiefTwoPencils

14k8 gold badges55 silver badges80 bronze badges

answered May 30, 2018 at 0:56

Philip Smith

2,82126 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Philip Smith Over a year ago

@ChiefTwoPencils My bad, copy paste error. Code adjusted.

Collectives™ on Stack Overflow

C# Interface Different Variable Types in Repository Methods

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related