使用通用类型&#39;System.Collections.Generic.List <T> &#39;在IRepository中需要1个类型参数

Question

I have a problem in my code below mentioned.It askes me the 1 argument. IRepository

public interface IUserRepository
{
    List GetAll(); // Error shows me here then i change this to List<User> GetAll(); but still getting the error.
}

Repository

public class UserRepository : IUserRepository
{
    private IDbConnection _db = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
    public List<User> GetAll()
    {
        return this._db.Query<User>("SELECT * FROM Users").ToList();
    }
}

Answer 1

You should try with:

public interface IUserRepository<T>
{
    List<T> GetAll(); 
}

And then:

public class UserRepository : IUserRepository<User>
{
    private IDbConnection _db = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
    public List<User> GetAll()
    {
        return this._db.Query<User>("SELECT * FROM Users").ToList();
    }
}