用洋葱架构重构

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/A.cs

@@ -1,15 +1,10 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace EFcoreOneToOneBug
+namespace EFcoreOneToOneBug
 {
     class A
     {
         public Guid Id { get; set; }
         public string Name { get; set; }
         public B? B { get; set; }
+        public Guid? BId { get; set; }
     }
 }

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/B.cs

@@ -1,15 +1,10 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace EFcoreOneToOneBug
+namespace EFcoreOneToOneBug
 {
     class B
     {
         public Guid Id { get; set; }
         public int Age { get; set; }
         public A A { get; set; }
+        public Guid AId { get; set; }
     }
 }

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/Migrations/20211029113915_Init.cs

@@ -0,0 +1,59 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace EFcoreOneToOneBug.Migrations
+{
+    public partial class Init : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "A",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    Name = table.Column<string>(type: "nvarchar(max)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_A", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "B",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    Age = table.Column<int>(type: "int", nullable: false),
+                    AId = table.Column<Guid>(type: "uniqueidentifier", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_B", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_B_A_AId",
+                        column: x => x.AId,
+                        principalTable: "A",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_B_AId",
+                table: "B",
+                column: "AId",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "B");
+
+            migrationBuilder.DropTable(
+                name: "A");
+        }
+    }
+}

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/Migrations/20211029115239_Init2.cs

@@ -0,0 +1,26 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace EFcoreOneToOneBug.Migrations
+{
+    public partial class Init2 : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<Guid>(
+                name: "BId",
+                table: "A",
+                type: "uniqueidentifier",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "BId",
+                table: "A");
+        }
+    }
+}

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/Migrations/MyDbContextModelSnapshot.cs

@@ -0,0 +1,81 @@
+// <auto-generated />
+using System;
+using EFcoreOneToOneBug;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace EFcoreOneToOneBug.Migrations
+{
+    [DbContext(typeof(MyDbContext))]
+    partial class MyDbContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.0-rc.2.21480.5")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder, 1L, 1);
+
+            modelBuilder.Entity("EFcoreOneToOneBug.A", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid?>("BId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("A");
+                });
+
+            modelBuilder.Entity("EFcoreOneToOneBug.B", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("AId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<int>("Age")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AId")
+                        .IsUnique();
+
+                    b.ToTable("B");
+                });
+
+            modelBuilder.Entity("EFcoreOneToOneBug.B", b =>
+                {
+                    b.HasOne("EFcoreOneToOneBug.A", "A")
+                        .WithOne("B")
+                        .HasForeignKey("EFcoreOneToOneBug.B", "AId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("A");
+                });
+
+            modelBuilder.Entity("EFcoreOneToOneBug.A", b =>
+                {
+                    b.Navigation("B");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

最后一章非项目代码/最后一章非项目代码/EFcoreOneToOneBug/MyDbContext.cs

@@ -9,13 +9,16 @@ class MyDbContext:DbContext
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
         {
             base.OnConfiguring(optionsBuilder);
+            optionsBuilder.LogTo(Console.WriteLine);
             optionsBuilder.UseSqlServer("Server=.;Database=testbug;Trusted_Connection=True;");
         }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
             base.OnModelCreating(modelBuilder);
-            modelBuilder.Entity<A>().HasOne(x => x.B).WithOne(x=>x.A);
+            modelBuilder.Entity<A>().HasOne(x => x.B).WithOne(x => x.A)
+                //.IsRequired(false)
+                .HasForeignKey<B>(x => x.AId);//.HasPrincipalKey<A>(x=>x.BId);
         }
     }
 }