在efcore 中创建类 通过实现IEntityTypeConfiguration<T>接口 实现实体类的伙伴类 实现FluentApi

 public partial class NewsCategory : IAggregationRoot
    {
        public NewsCategory() { }
        public Guid Id { get; set; }
        public string CategoryName { get; set; }
        public bool IsDel { get; set; }
        public string Code { get; set; }
    }

public class NewsCategoryMap : IEntityTypeConfiguration<NewsCategory>
    {
        public void Configure(EntityTypeBuilder<NewsCategory> builder)
        {
            builder.ToTable("NewsCategory");
        }
    }

 public class NewsEFCoreContext:DbContext,INewsContext
    {
       
        public DbSet<NewsCategory> Categories { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            //先直接写连接字符串，生成数据库。后续再在配置文件中配置，并使用到此处
            optionsBuilder.UseSqlServer("Server=localhost;Database=wehope;User ID=sa;Password=0");
            //optionsBuilder.UseSqlServer(AppSetting.GetAppSetting("DealerContext"));
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.ApplyConfiguration<NewsCategory>(new NewsCategoryMap());
            base.OnModelCreating(modelBuilder); 
        }
    }