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IDE : VS 2008,
Platform : .NET 3.5,
Hi,
I typically dont create interfaces unless i have to, however in my current application i have to create interfaces in the Data access layer. I'm a in a minor confusion that hwo do i create those interfaces more how to implement them:
the following code might make things clear:
I have the following class and interface in the data access namespace |
using ConsoleApplication8.BusinessLayer;
using
ConsoleApplication8.DataAccessLayer ;
using System.Data ;
using System
;
Namespace DataAccessLayer
{
Public Class CountryGateway :
ICountryGateway
{
public
void InitCountry()
{
//write
code
}
public
Int32 saveCountry(ByRef obj As Country)
{
//write
code
}
//
//implementation
for other methods SearchByIndex() SearchByName and
UpdateCountry()
//
//
}
Interface
ICountryGateway {
void
InitCountry() ;
Int32
saveCountry(ref obj As
Country) ;
DataSet
SearchByIndex(countryNo As
String)
DataSet
SearchByName(countryName As
String);
Int32
updateCountry(ref country As
Country);
}
}
Namespace
BusinessLayer {
Public Class Country
{
}
}
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1. Is this way implement the interface in the data access layer? (in this case the class CountryGateway access the database.) i.e: That we should create interfaces to access DB in the DAL and then we should also write the implementation for those interfaces in the DAL?
2. I have been told that we should create interfaces than abstract classes espcially in the data access layer, is there a particular reason for this?