I personally stick with Database first when using EF on any schema that is this level of complexity. I have had issues with complex schemas in regards to code first. Maybe the newer versions are a little better, but worrying how to try and code complex relationships seems less straight forward then allowing the engine … Read more
You can and this case must define the many-to-many relationship with Fluent API: modelBuilder.Entity<User>() .HasMany(u => u.StarredWidgets) .WithMany() // <- no parameter here because there is no navigation property .Map(m => { m.MapLeftKey(“UserId”); m.MapRightKey(“WidgetId”); m.ToTable(“UserWidgets”); });
This ended up working for me, Entity Framework 5. Turn off automatic migrations Migrate to create the initial table, no frills Declare the ClusterId as Identity (annotation) [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public override int ClusterId { get; set; } Migrate Declare the pk property Id as Identity after the other one has been updated [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public override Guid … Read more
update-database -verbose doesn’t work because your model has been changed after your data table already existed. First, make sure there are no changes to the UserProfile class. Then, run: Add-Migration InitialMigrations -IgnoreChanges This should generate a blank “InitialMigration” file. Now, add any desired changes to the UserProfile class. Once changes are added, run the update … Read more
Setting AutoDetectChangesEnabled to false doesn’t disable change tracking. (That’s what the AsNoTracking() extension method would do.) It just disables the automatic call of DetectChanges that would otherwise occur in many DbContext API methods. But DetectChanges isn’t the only method that participates in change tracking. However, if you don’t call it manually at the right places … Read more
The feature you are talking about is called Relationship Span or Relationship Fixup and indeed – as you have noticed – it does not work for many-to-many relationships. It only works if at least one end of the association has multiplicity 1 (or 0..1), i.e. it works for one-to-many or one-to-one relationships. Relationship Span relies … Read more
I found the code working by changing static LaundryShopContext() { Database.SetInitializer<LaundryShopContext>( new DropCreateDatabaseIfModelChanges<LaundryShopContext>()); } into static LaundryShopContext() { Database.SetInitializer<LaundryShopContext>( new DropCreateDatabaseAlways<LaundryShopContext>()); }
Gorane, this should get you started… (I haven’t played much with it – it takes a bit of experimenting in the debugger to see which properties / info and how to get it) using (var db = new MyDbContext()) { var objectContext = ((IObjectContextAdapter)db).ObjectContext; var container = objectContext.MetadataWorkspace.GetEntityContainer(objectContext.DefaultContainerName, DataSpace.CSpace); foreach (var set in container.BaseEntitySets) { … Read more
A downvote brought this answer back into my attention (thank you). I now see that a big part of it is nonsense. Sure enough, the reason for the endless loop is relationship fixup. But you can’t stop EF from doing that. Even when using AsNoTracking, EF performs relationship fixup in the objects that are materialized … Read more
You can compare just specified parts: context.tblvalue.Any(x => x.date.Year == data.Year && x.date.Month == data.Month && x.date.Day == data.Day); EDIT: You can also try the following: context.tblvalue.Any(x => EntityFunctions.TruncateTime(x.date) == data.Date); Another approach: context.tblvalue.Any(x => SqlFunctions.DatePart(“year”, x.date) == data.Year && SqlFunctions.DatePart(“month”, x.date) == data.Month && SqlFunctions.DatePart(“day”, x.date) == data.Day);