You can add a method to your DbContext
or an extension method that uses the ChangeTracker to detach all the Added, Modified, and Deleted entities:
public void DetachAllEntities()
{
var changedEntriesCopy = this.ChangeTracker.Entries()
.Where(e => e.State == EntityState.Added ||
e.State == EntityState.Modified ||
e.State == EntityState.Deleted)
.ToList();
foreach (var entry in changedEntriesCopy)
entry.State = EntityState.Detached;
}