{
if (hasRelationship)
{
//Remove the relationship between the entitis
Detach(originalEntity);
}
m_context.GetTable<TEntity>().Attach(originalEntity);
update(originalEntity);
SubmitChanges(m_context);
}
catch (InvalidCastException ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
catch (NotSupportedException ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
catch (Exception ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
}
}
if (hasRelationship)
{
//Remove the relationship between the entitis
Detach(originalEntity);
}
m_context.GetTable<TEntity>().Attach(originalEntity);
update(originalEntity);
SubmitChanges(m_context);
}
catch (InvalidCastException ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
catch (NotSupportedException ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
catch (Exception ex)
{
LogService.Error("Update Entity error.", ex);
return false;
}
}
}
现在，我们拥有了一个通用的公共类，实体对象的访问类可以继承它。例如：
public class EmployeeAccessor:AccessorBase<Employee,NorthwindDataContext>
{
}
{
}
你不需要实现任何方法，就能够很方便地对实体对象进行操作：
[TestMethod()]
public void UpdateEmployee()
{
EmployeeAccessor accessor = new EmployeeAccessor();
IList<Employee> entities = accessor.Where(e => e.EmployeeID == 1);
if (entities != null && entities.Count > 0)
{
entities[0].FirstName = "Bruce";
entities[0].LastName = "Zhang";
accessor.Update(entities[0],true,true);
}
}
{
EmployeeAccessor accessor = new EmployeeAccessor();
IList<Employee> entities = accessor.Where(e => e.EmployeeID == 1);
if (entities != null && entities.Count > 0)
{
entities[0].FirstName = "Bruce";
entities[0].LastName = "Zhang";
accessor.Update(entities[0],true,true);
}
}
你甚至可以直接让Employee实体类继承基类：
public partial class Employee:AccessorBase<Employee,NorthwindDataContext>
{
}
{
}
这种方法类似于充血模式，正如Martin Fowler在Anemic Domain Model一文中提到的那样。
源代码下载：Download Source - 126kb
