这是我到目前为止得到的，但必须不断传递 DataClassesDataContext。我想知道是否有更好的更集中的方式来使用 DataClassesDataContext 并在每次使用数据上下文时填充连接字符串......提前感谢所有帮助
public interface ICustomerDataAccess
{
string GetCustomerName(int customerId);
}
public class CustomerDataAccess : ICustomerDataAccess
{
private readonly DataClassesDataContext _context;
public CustomerDataAccess(DataClassesDataContext ctx)
{
_context = ctx;
}
public string GetCustomerName(int id)
{
return _context.Customers.Where(i => i.id == id).FirstOrDefault().name;
}
}
public class DataAccessFactory
{
public static ICustomerDataAccess GetCustomerDataAccessObj(DataClassesDataContext ctx)
{
return new CustomerDataAccess(ctx);
}
}
public class CustomerService
{
CustomerBusinessLogic _customerBL;
public CustomerService(DataClassesDataContext ctx)
{
_customerBL = new CustomerBusinessLogic(new CustomerDataAccess(ctx));
}
public string GetCustomerName(int id, DataClasses1DataContext ctx)
{
return _customerBL.GetCustomerName(id,ctx);
}
}
public class CustomerBusinessLogic
{
ICustomerDataAccess _custDataAccess;
public CustomerBusinessLogic(ICustomerDataAccess custDataAccess)
{
_custDataAccess = custDataAccess;
}
public CustomerBusinessLogic(DataClassesDataContext ctx)
{
_custDataAccess = new CustomerDataAccess(ctx);
}
public string GetCustomerName(int id, DataClassesDataContext ctx)
{
_custDataAccess = DataAccessFactory.GetCustomerDataAccessObj(ctx);
return _custDataAccess.GetCustomerName(id);
}
}
// 并在界面上使用这样的代码
private void button5_Click(object sender, EventArgs e)
{
using (var ctx = new DataClassesDataContext)
{
CustomerService customerSrv = new CustomerService(ctx);
textBox1.Text = customerSrv.GetCustomerName(1, ctx);
}
}