<pre><pre lang="c#">public class DataBase : IDataBase { private List<Proveedor> proveedors; private List<Factura> facturas; private List<FacturadeArticulo> facturadeArticulos; public DataBase() { this.proveedors= new List<Proveedor>(); this.facturas= new List<Factura>(); this.facturadeArticulos= new List<FacturadeArticulo>(); } public Proveedor AddProveedor(Proveedor item) { // acces db if (item == null) { throw new ArgumentNullException("item"); } users.Add(item); return item; } }
public interface IDatabase { Proveedor Add(Proveedor item); }
var
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