Typed Datasets Are Not Always The Answer

7 Comments

• Roy, your right about it being a design decision. We decided to treat out TDS's as DTO's as opposed to business objects, which i think works great and allows you to pass your object "through" business logic instead of being coupled with it. But again it depends on your ultimate architecture... there a lots of ways to solve the same problems. Also, i think updating a TDS is very trivial and shouldn't be seen as a challenge in terms of maint. as compared to custom business entities.
  

• Nathen: Type Safety is important. But In order to keep the Presentation layer seperate from the data layer, you can't have a direct reference to the typed datasets (IMO). The only way to incroporate them into an enterprise application is stated in this post(See the ending paragraph - It essentially implies what you are suggesting). Also, If TD's are god for enterprise apps, why wouldn;t ehy be good for small apps?
  

• I'm afraid that you have only explored the peak of the iceberg. As an example you are not considered that the DataSet could be business based and nor DataBase Based. By the way the data access layer is the Database itself with its SP, and not the access to it, that should be in the business layer getting flexibility doing that.
  

• Try using partial classes to inject your business rules.
  
  very powerful feature of partial classes
  

• I agree with the original poster's technical lead. I am a proponent of hiding datasets within my business objects.
  
  However, My DataGridView needs the dataset to bind to and this defeats all my atempts to make the dataset private to my business objects. Any solutions to this problem ?
  
  --Sharad Singhal
  

• I asume your DataGridView is inheriting from the DataGrid.
  
  Well the datagrid looks for some Interfaces like
  IListSource and IList
  If you give a good look at the DataSet or DataTable they implement de interface IListSource.
  
  So de code:
  
  .SetDataBinding(CType(,ListSource),)
  
  Will Work.
  
  If you Implement the Interface IListSource in your Business objects.
  
  Then the code will be:
  
  .SetDataBinding(CType(,ListSource),)
  --Arnold Kalsbeek
  
  
  
  

• I think that we would have to improve our world with innovations and more design patterns to help development process and "Typed Datasets" do not explores our creativity and do not enriches developed applications. They comes to ease, it does not come to improve.