CSharp: donet 6 database create view with EF Core 6

 

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[Keyless] public class PersonOrderCount {     public string Name { get; set; }     public int Count { get; set; } } public class Person {     public int PersonId { get; set; }     public string Name { get; set; }       public ICollection<Order> Orders { get; set; } } public class Order {     public int OrderId { get; set; }     public int PersonId { get; set; }     public string Description { get; set; }     public int Price { get; set; }       public Person Person { get; set; } }     class ApplicationDbContext : DbContext {     public DbSet<Person> Persons { get; set; }     public DbSet<Order> Orders { get; set; }     public DbSet<PersonOrderCount> PersonOrderCounts { get; set; }     protected override void OnModelCreating(ModelBuilder modelBuilder)     {         modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());           modelBuilder.Entity<Person>()             .HasMany(p => p.Orders)             .WithOne(o => o.Person)             .HasForeignKey(o => o.PersonId);         //创建视图         modelBuilder.Entity<PersonOrderCount>()             .HasNoKey()             .ToView("vw_PersonOrderCount");     }       protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)     {         optionsBuilder.UseSqlServer("Server=DESKTOP-NQK85G5\\GEOVIN2008;Database=geovinduDBA;User ID=SA;Password=geovindu;TrustServerCertificate=True");     } }     [DbContext(typeof(ApplicationDbContext))]     partial class ApplicationDbContextModelSnapshot : ModelSnapshot     {         protected override void BuildModel(ModelBuilder modelBuilder)         { #pragma warning disable 612, 618             modelBuilder                 .HasAnnotation("ProductVersion", "7.0.0")                 .HasAnnotation("Relational:MaxIdentifierLength", 128);               SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);               modelBuilder.Entity("Order", b =>                 {                     b.Property<int>("OrderId")                         .ValueGeneratedOnAdd()                         .HasColumnType("int");                       SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("OrderId"));                       b.Property<string>("Description")                         .IsRequired()                         .HasColumnType("nvarchar(max)");                       b.Property<int>("PersonId")                         .HasColumnType("int");                       b.Property<int>("Price")                         .HasColumnType("int");                       b.HasKey("OrderId");                       b.HasIndex("PersonId");                       b.ToTable("Orders");                       b.HasData(                         new                         {                             OrderId = 1,                             Description = "...",                             PersonId = 1,                             Price = 10                         },                         new                         {                             OrderId = 2,                             Description = "...",                             PersonId = 2,                             Price = 20                         },                         new                         {                             OrderId = 3,                             Description = "...",                             PersonId = 4,                             Price = 30                         },                         new                         {                             OrderId = 4,                             Description = "...",                             PersonId = 5,                             Price = 40                         },                         new                         {                             OrderId = 5,                             Description = "...",                             PersonId = 1,                             Price = 50                         },                         new                         {                             OrderId = 6,                             Description = "...",                             PersonId = 6,                             Price = 60                         },                         new                         {                             OrderId = 7,                             Description = "...",                             PersonId = 7,                             Price = 70                         },                         new                         {                             OrderId = 8,                             Description = "...",                             PersonId = 1,                             Price = 80                         },                         new                         {                             OrderId = 9,                             Description = "...",                             PersonId = 8,                             Price = 90                         },                         new                         {                             OrderId = 10,                             Description = "...",                             PersonId = 9,                             Price = 100                         },                         new                         {                             OrderId = 11,                             Description = "...",                             PersonId = 1,                             Price = 110                         },                         new                         {                             OrderId = 12,                             Description = "...",                             PersonId = 2,                             Price = 120                         },                         new                         {                             OrderId = 13,                             Description = "...",                             PersonId = 2,                             Price = 130                         },                         new                         {                             OrderId = 14,                             Description = "...",                             PersonId = 3,                             Price = 140                         },                         new                         {                             OrderId = 15,                             Description = "...",                             PersonId = 1,                             Price = 150                         },                         new                         {                             OrderId = 16,                             Description = "...",                             PersonId = 4,                             Price = 160                         },                         new                         {                             OrderId = 17,                             Description = "...",                             PersonId = 1,                             Price = 170                         },                         new                         {                             OrderId = 18,                             Description = "...",                             PersonId = 1,                             Price = 180                         },                         new                         {                             OrderId = 19,                             Description = "...",                             PersonId = 5,                             Price = 190                         },                         new                         {                             OrderId = 20,                             Description = "...",                             PersonId = 6,                             Price = 200                         },                         new                         {                             OrderId = 21,                             Description = "...",                             PersonId = 1,                             Price = 210                         },                         new                         {                             OrderId = 22,                             Description = "...",                             PersonId = 7,                             Price = 220                         },                         new                         {                             OrderId = 23,                             Description = "...",                             PersonId = 7,                             Price = 230                         },                         new                         {                             OrderId = 24,                             Description = "...",                             PersonId = 8,                             Price = 240                         },                         new                         {                             OrderId = 25,                             Description = "...",                             PersonId = 1,                             Price = 250                         },                         new                         {                             OrderId = 26,                             Description = "...",                             PersonId = 1,                             Price = 260                         },                         new                         {                             OrderId = 27,                             Description = "...",                             PersonId = 9,                             Price = 270                         },                         new                         {                             OrderId = 28,                             Description = "...",                             PersonId = 9,                             Price = 280                         },                         new                         {                             OrderId = 29,                             Description = "...",                             PersonId = 9,                             Price = 290                         },                         new                         {                             OrderId = 30,                             Description = "...",                             PersonId = 2,                             Price = 300                         },                         new                         {                             OrderId = 31,                             Description = "...",                             PersonId = 3,                             Price = 310                         },                         new                         {                             OrderId = 32,                             Description = "...",                             PersonId = 1,                             Price = 320                         },                         new                         {                             OrderId = 33,                             Description = "...",                             PersonId = 1,                             Price = 330                         },                         new                         {                             OrderId = 34,                             Description = "...",                             PersonId = 1,                             Price = 340                         },                         new                         {                             OrderId = 35,                             Description = "...",                             PersonId = 5,                             Price = 350                         },                         new                         {                             OrderId = 36,                             Description = "...",                             PersonId = 1,                             Price = 360                         },                         new                         {                             OrderId = 37,                             Description = "...",                             PersonId = 5,                             Price = 370                         },                         new                         {                             OrderId = 38,                             Description = "...",                             PersonId = 1,                             Price = 380                         },                         new                         {                             OrderId = 39,                             Description = "...",                             PersonId = 1,                             Price = 390                         },                         new                         {                             OrderId = 40,                             Description = "...",                             PersonId = 1,                             Price = 400                         });                 });               modelBuilder.Entity("Person", b =>                 {                     b.Property<int>("PersonId")                         .ValueGeneratedOnAdd()                         .HasColumnType("int");                       SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("PersonId"));                       b.Property<string>("Name")                         .IsRequired()                         .HasColumnType("nvarchar(max)");                       b.HasKey("PersonId");                       b.ToTable("Persons");                       b.HasData(                         new                         {                             PersonId = 1,                             Name = "Ayşe"                         },                         new                         {                             PersonId = 2,                             Name = "Hilmi"                         },                         new                         {                             PersonId = 3,                             Name = "Raziye"                         },                         new                         {                             PersonId = 4,                             Name = "Süleyman"                         },                         new                         {                             PersonId = 5,                             Name = "Fadime"                         },                         new                         {                             PersonId = 6,                             Name = "Şuayip"                         },                         new                         {                             PersonId = 7,                             Name = "geovindu"                         },                         new                         {                             PersonId = 8,                             Name = "Geovin Du"                         },                         new                         {                             PersonId = 9,                             Name = "涂聚文"                         },                         new                         {                             PersonId = 10,                             Name = "Muaviye"                         });                 });               modelBuilder.Entity("PersonOrderCount", b =>                 {                     b.Property<int>("Count")                         .HasColumnType("int");                       b.Property<string>("Name")                         .IsRequired()                         .HasColumnType("nvarchar(max)");                       b.ToTable((string)null);                       b.ToView("vw_PersonOrderCount", (string)null);                 });               modelBuilder.Entity("Order", b =>                 {                     b.HasOne("Person", "Person")                         .WithMany("Orders")                         .HasForeignKey("PersonId")                         .OnDelete(DeleteBehavior.Cascade)                         .IsRequired();                       b.Navigation("Person");                 });               modelBuilder.Entity("Person", b =>                 {                     b.Navigation("Orders");                 }); #pragma warning restore 612, 618         }     }

　　

调用：

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//创建表和初始化数据 ApplicationDbContext context = new();   await context.Database.MigrateAsync();     var datas = await context.PersonOrderCounts.ToListAsync(); foreach(var data in datas) {     Console.WriteLine(data.Name+"\t\n"); } Console.WriteLine();

　　

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