CSharp: donet 6 with Entity Framework Core 6 or 7

 

    /// <summary>
    /// 
    ///Entity
    /// </summary>
    public class Product
    {

        public Product() { }    

        public int Id { get; set; }
        public string Name { get; set; }
        public int Quantity { get; set; }
        public float Price { get; set; }
    }

    /// <summary>
    /// Entity
    /// geovindu, Geovin Du
    /// </summary>
    public class Customer
    {

        public Customer() {

    
        }
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    /// <summary>
    /// 
    /// </summary>
    public class ECommerceDbContext : DbContext
    {
        public DbSet<Product> Products { get; set; }
        public DbSet<Customer> Customers { get; set; }
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer("Server=DESKTOP-NQK85G5\\GEOVIN2008;Database=geovinduCoreDBA;User Id=sa;Password=geovindu;");
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="modelBuilder"></param>
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Product>();
            modelBuilder.Entity<Customer>();
            base.OnModelCreating(modelBuilder);
        }
    }


    /// <summary>
    /// 初始化創建表格
    /// </summary>
    [DbContext(typeof(ECommerceDbContext))]
    partial class ECommerceDbContextModelSnapshot : ModelSnapshot
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="modelBuilder"></param>
        protected override void BuildModel(ModelBuilder modelBuilder)
        {
#pragma warning disable 612, 618
            //ProductVersion
            modelBuilder
                .HasAnnotation("ProductVersion", "6.0.6")
                .HasAnnotation("Relational:MaxIdentifierLength", 128);

            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder, 1L, 1);
            //Customer
            modelBuilder.Entity("Customer", b =>
                {
                    b.Property<int>("Id")
                        .ValueGeneratedOnAdd()
                        .HasColumnType("int");

                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"), 1L, 1);

                    b.Property<string>("FirstName")
                        .IsRequired()
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("LastName")
                        .IsRequired()
                        .HasColumnType("nvarchar(max)");

                    b.HasKey("Id");

                    b.ToTable("Customers");
                });
            //Product
            modelBuilder.Entity("Product", b =>
                {
                    b.Property<int>("Id")
                        .ValueGeneratedOnAdd()
                        .HasColumnType("int");

                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"), 1L, 1);

                    b.Property<string>("Name")
                        .IsRequired()
                        .HasColumnType("nvarchar(max)");

                    b.Property<float>("Price")
                        .HasColumnType("real");

                    b.Property<int>("Quantity")
                        .HasColumnType("int");

                    b.HasKey("Id");

                    b.ToTable("Products");
                });
#pragma warning restore 612, 618
        }
    }

　　

調用：

//初始化表格至數據庫
ECommerceDbContext context = new();
await context.Database.MigrateAsync();

//
context = new ECommerceDbContext();
List<Customer> customers = new List<Customer>();
//添加
Customer customer=new Customer();
customer.FirstName= "塗";
customer.LastName = "聚文";
customers.Add(customer);
customer = new Customer();
customer.FirstName = "Du";
customer.LastName = "geovind";
customers.Add(customer);
context.Customers.AddRange(customers);
int k=context.SaveChanges();
if (k > 0)
{
    Console.WriteLine("ok");
}
//查詢
var custer=context.Customers.FirstOrDefault();
Console.WriteLine(custer.FirstName+","+custer.LastName);

　　

輸出：