How can we assume a bool Property on a Generic class , where T is a auto generated LINQ2SQL class?

You can declare this on an interface: public interface ICanDelete { bool IsDeleted {get;set;} } and let implicit interface implementation work its magic. Then the question becomes: "how to let it know that my entities implement this interface? ".

Two options: add a partial class per entity (in a different file): partial class Customer : ICanDelete {} partial class Order : ICanDelete {} edit the dbml to specify this interface as the base class: Database EntityBase="Some.NameSpace. ICanDelete (this makes LINQ-to-SQL's code-generation add the : Some.NameSpace. ICanDelete for you) Then just use this interface in the generic clause: where T : ICanDelete.

You can declare this on an interface: public interface ICanDelete { bool IsDeleted {get;set;} } and let implicit interface implementation work its magic. Then the question becomes: "how to let it know that my entities implement this interface? ".

Two options: add a partial class per entity (in a different file): partial class Customer : ICanDelete {} partial class Order : ICanDelete {} edit the dbml to specify this interface as the base class: (this makes LINQ-to-SQL's code-generation add the : Some.NameSpace. ICanDelete for you) Then just use this interface in the generic clause: where T : ICanDelete.

Perfet that worked for me, with a very minimal code change. – Jobi Joy Nov 14 '09 at 21:08.

1) Define ISoftDelete public interface ISoftDelete { bool IsDeleted { get; set; } } 2) Create partial classes for all your entities public partial class MyLinqEntity : ISoftDelete { } public partial class MyOtherLinqEntity : ISoftDelete { } public partial class MyFurtherLinqEntity : ISoftDelete { } 3) Add your interface to the generic type restriction public abstract class CRUDOperations : where T is ISoftDelete.

– Jobi Joy Nov 14 '09 at 20:29 Yep. There are other ways of doing this in the designer, but I prefer this method as I'll have all these partials I can use to modify my entities. Also, if I have to ditch the DBML and start over again (happens more than I would like) I won't have to redo all my customization work.

– Will? Nov 14 '09 at 20:31 IIRC, you can't do this in the designer - you have to hand-edit the dbml. – Marc Gravell?

Nov 14 '09 at 20:33.

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