21、Entity Framework Core: Cascading Deletes, Database Views, and Global Query Filters

Entity Framework Core: Cascading Deletes, Database Views, and Global Query Filters

1. Cascading Deletes in Entity Framework Core

Cascading delete settings in Entity Framework Core are defined in the relationship declaration using the OnDelete() method and the DeleteBehavior enumeration. Here’s an example of how to set up different cascading delete options for different detail classes related to a Master class:

modelBuilder.Entity<Detail1>()
    .HasOne(f => f.Master)
    .WithMany(t => t.Detail1Set)
    .HasForeignKey(x => x.MasterId)
    .OnDelete(DeleteBehavior.Cascade);

modelBuilder.Entity<Detail2>()
    .HasOne(f => f.Master)
    .WithMany(t => t