小编Dmi*_*iuk的帖子

我有一个实体配置文件，并在 的帮助下播种数据HasData，如下例所示。

public class PublicationConfiguration : IEntityTypeConfiguration<Publication>
    {
        public void Configure(EntityTypeBuilder<Publication> builder)
        {
            builder.Property(p => p.Image)
                .HasMaxLength(256)
                .HasDefaultValue("default-publication.png")
                .IsRequired();

            builder.Property(p => p.Title)
                .HasMaxLength(256)
                .IsRequired();

            builder.Property(p => p.Value)
                .IsRequired();

            builder.Property(p => p.PublisherId)
                .IsRequired();

            builder.Property(p => p.CategoryId)
                .IsRequired();

            builder.HasOne(p => p.Category)
                .WithMany(categ => categ.Publications)
                .OnDelete(DeleteBehavior.Restrict);

            builder.HasOne(p => p.Publisher)
                .WithMany(pub => pub.Publications)
                .OnDelete(DeleteBehavior.Restrict);

            builder.HasData(
                new Publication {
                    Id = "publication-one",
                    Title = "the first publication",
                    Value = "the content of the very first publication on the web-site",
                    CreatedAt = DateTime.Now,
                    CategoryId …