Entity Framework soft delete implementation using database interceptor not working

Question

I have implemented a database soft delete (a boolean flag that marks entries as deleted) using the following tutorial: http://www.codeguru.com/csharp/csharp/soft-deleting-en

Answer 1

There is a bug in ApplicationDbContext.cs:

protected new void OnModelCreating(DbModelBuilder modelBuilder) {...}

You are using "new" instead of "override" so OnModelCreating is never executed (try to add a breakpoint to check it). So AttributeToTableAnnotationConvention never runs and entity annotation is never added.

Changing it to

protected override void OnModelCreating(DbModelBuilder modelBuilder) {...}

will make it work

Answer 2

Well, you code seems fine to me. Perhaps there is a little mistake that is breaking your app. You could try this:

1. Remove the SoftDeleteAttribute from BC_Instance

2. Edit the OnModelCreating method

   AttributeToTableAnnotationConvention<SoftDeleteAttribute, string> conv =
      new AttributeToTableAnnotationConvention<SoftDeleteAttribute, string>(
         "SoftDeleteColumnName",
         (type, attributes) => attributes.Single().ColumnName);
   
   modelBuilder.Conventions.Add(conv);
   //this will dynamically add the attribute to all models
   modelBuilder.Types().Configure(delegate(ConventionTypeConfiguration i)
   {
       i.HasTableAnnotation("SoftDeleteColumnName", Entity.G etSoftDeleteColumnName());
   });
   

3. Delete ApplicationDbConfiguration class

4. Edit the context's constructor

   public ApplicationDbContext()
       : base("DefaultConnection", throwIfV1Schema: false)
   {
       DbInterception.Add(new SoftDeleteInterceptor());
   }
   

Hope this helps!