How to implement repository pattern in ASP.NET core 2.1

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entity-framework

MVC6

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Problem

How to implement repository pattern in asp.net core 2.1 visual studio 2017 with SQL server 2012 ?

i work on project work on repository pattern but i cannot implement it




1- How to define repository on controller Employee to call function GetAll on constructor?

meaning how to define repository on constructor of controller

2- what i write on startup to define these modules and connection ?

3- suppose i have compost key how to use getbyid suppose i have (Employeid,branchcode) as compost key ?

are compost key define as fluent api or annotation or what ?

please can you help me and give me details if possible

can any one answer me of this question please ?

What I have tried:

model Employee

public class Employee   
{   
public int EmployeeId { get; set; }   
public int BranchCode { get; set; }   
public string EmployeeName { get; set; }   
public int EmployeeAge { get; set; }   
}   
Repository public class RepositoryTab<T> : IrepositoryTab<T> where T : class   
{   
protected TabDbContext db { get; set; }   
private DbSet<T> dbSet;  
 public RepositoryTab(TabDbContext Tabdb)   
{              
 db = Tabdb;              
 dbSet = db.Set<T>();   
}   
public IEnumerable<T> GetAll()   
{  
 return dbSet.ToList();  
 }   
}   
public interface IrepositoryTab<T> where T : class { IEnumerable<T> GetAll();        
T GetById(object Id);  
 }