Copy .NET 6 code to .NET 9 folder

aspnetcore/data/ef-rp/intro/samples/cu90/ContosoUniversity.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+      <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+<!-- -->
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+	  <DefineConstants>$(DefineConstants)TRACE;SQLiteVersion</DefineConstants>
+	</PropertyGroup>
+
+  <ItemGroup>
+	  <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="6.0.0" />
+	  <PackageReference Include="Microsoft.EntityFrameworkCore.SQLite" Version="6.0.0" />
+	  <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>

aspnetcore/data/ef-rp/intro/samples/cu90/Data/DbInitializer1.cs

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+#define FIRST
+#if FIRST  // First DbInitializer used
+// <snippet>
+using ContosoUniversity.Models;
+
+namespace ContosoUniversity.Data
+{
+    public static class DbInitializer
+    {
+        public static void Initialize(SchoolContext context)
+        {
+            // Look for any students.
+            if (context.Students.Any())
+            {
+                return;   // DB has been seeded
+            }
+
+            var students = new Student[]
+            {
+                new Student{FirstMidName="Carson",LastName="Alexander",EnrollmentDate=DateTime.Parse("2019-09-01")},
+                new Student{FirstMidName="Meredith",LastName="Alonso",EnrollmentDate=DateTime.Parse("2017-09-01")},
+                new Student{FirstMidName="Arturo",LastName="Anand",EnrollmentDate=DateTime.Parse("2018-09-01")},
+                new Student{FirstMidName="Gytis",LastName="Barzdukas",EnrollmentDate=DateTime.Parse("2017-09-01")},
+                new Student{FirstMidName="Yan",LastName="Li",EnrollmentDate=DateTime.Parse("2017-09-01")},
+                new Student{FirstMidName="Peggy",LastName="Justice",EnrollmentDate=DateTime.Parse("2016-09-01")},
+                new Student{FirstMidName="Laura",LastName="Norman",EnrollmentDate=DateTime.Parse("2018-09-01")},
+                new Student{FirstMidName="Nino",LastName="Olivetto",EnrollmentDate=DateTime.Parse("2019-09-01")}
+            };
+
+            context.Students.AddRange(students);
+            context.SaveChanges();
+
+            var courses = new Course[]
+            {
+                new Course{CourseID=1050,Title="Chemistry",Credits=3},
+                new Course{CourseID=4022,Title="Microeconomics",Credits=3},
+                new Course{CourseID=4041,Title="Macroeconomics",Credits=3},
+                new Course{CourseID=1045,Title="Calculus",Credits=4},
+                new Course{CourseID=3141,Title="Trigonometry",Credits=4},
+                new Course{CourseID=2021,Title="Composition",Credits=3},
+                new Course{CourseID=2042,Title="Literature",Credits=4}
+            };
+
+            context.Courses.AddRange(courses);
+            context.SaveChanges();
+
+            var enrollments = new Enrollment[]
+            {
+                new Enrollment{StudentID=1,CourseID=1050,Grade=Grade.A},
+                new Enrollment{StudentID=1,CourseID=4022,Grade=Grade.C},
+                new Enrollment{StudentID=1,CourseID=4041,Grade=Grade.B},
+                new Enrollment{StudentID=2,CourseID=1045,Grade=Grade.B},
+                new Enrollment{StudentID=2,CourseID=3141,Grade=Grade.F},
+                new Enrollment{StudentID=2,CourseID=2021,Grade=Grade.F},
+                new Enrollment{StudentID=3,CourseID=1050},
+                new Enrollment{StudentID=4,CourseID=1050},
+                new Enrollment{StudentID=4,CourseID=4022,Grade=Grade.F},
+                new Enrollment{StudentID=5,CourseID=4041,Grade=Grade.C},
+                new Enrollment{StudentID=6,CourseID=1045},
+                new Enrollment{StudentID=7,CourseID=3141,Grade=Grade.A},
+            };
+
+            context.Enrollments.AddRange(enrollments);
+            context.SaveChanges();
+        }
+    }
+}
+// </snippet>
+#endif

aspnetcore/data/ef-rp/intro/samples/cu90/Data/SchoolContext.cs

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+#define First // LAST First
+#if First
+// <snippet_first>
+using ContosoUniversity.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace ContosoUniversity.Data
+{
+    public class SchoolContext : DbContext
+    {
+        public SchoolContext (DbContextOptions<SchoolContext> options)
+            : base(options)
+        {
+        }
+
+        public DbSet<Student> Students { get; set; }
+        public DbSet<Enrollment> Enrollments { get; set; }
+        public DbSet<Course> Courses { get; set; }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Course>().ToTable("Course");
+            modelBuilder.Entity<Enrollment>().ToTable("Enrollment");
+            modelBuilder.Entity<Student>().ToTable("Student");
+        }
+    }
+}
+// </snippet_first>
+#elif LAST
+#endif

aspnetcore/data/ef-rp/intro/samples/cu90/Models/Course.cs

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+#define FIRST
+#if FIRST
+// <snippet_first>
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Course
+    {
+        [DatabaseGenerated(DatabaseGeneratedOption.None)]
+        public int CourseID { get; set; }
+        public string Title { get; set; }
+        public int Credits { get; set; }
+
+        public ICollection<Enrollment> Enrollments { get; set; }
+    }
+}
+// </snippet_first>
+#elif LAST
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+// <snippet_last>
+    public class Course
+    {
+        [DatabaseGenerated(DatabaseGeneratedOption.None)]
+        [Display(Name = "Number")]
+        public int CourseID { get; set; }
+
+        [StringLength(50, MinimumLength = 3)]
+        public string Title { get; set; }
+
+        [Range(0, 5)]
+        public int Credits { get; set; }
+
+        public int DepartmentID { get; set; }
+
+        public Department Department { get; set; }
+        public ICollection<Enrollment> Enrollments { get; set; }
+        public ICollection<Instructor> Instructors { get; set; }
+    }
+}
+// </snippet_last>
+#endif

aspnetcore/data/ef-rp/intro/samples/cu90/Models/Department.cs

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+#define FIRST
+#if FIRST
+// <snippet1>
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Department
+    {
+        public int DepartmentID { get; set; }
+
+        [StringLength(50, MinimumLength = 3)]
+        public string Name { get; set; }
+
+        [DataType(DataType.Currency)]
+        [Column(TypeName = "money")]
+        public decimal Budget { get; set; }
+
+        [DataType(DataType.Date)]
+        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}",
+                       ApplyFormatInEditMode = true)]
+        [Display(Name = "Start Date")]
+        public DateTime StartDate { get; set; }
+
+        public int? InstructorID { get; set; }
+
+        public Instructor Administrator { get; set; }
+        public ICollection<Course> Courses { get; set; }
+    }
+}
+// </snippet1>
+#else
+#if SQLiteVersion
+// <snippetSL>
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Department
+    {
+        public int DepartmentID { get; set; }
+
+        [StringLength(50, MinimumLength = 3)]
+        public string Name { get; set; }
+
+        [DataType(DataType.Currency)]
+        [Column(TypeName = "money")]
+        public decimal Budget { get; set; }
+
+        [DataType(DataType.Date)]
+        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}",
+                       ApplyFormatInEditMode = true)]
+        [Display(Name = "Start Date")]
+        public DateTime StartDate { get; set; }
+
+        public int? InstructorID { get; set; }
+
+        public Guid ConcurrencyToken { get; set; } = Guid.NewGuid();
+
+        public Instructor Administrator { get; set; }
+        public ICollection<Course> Courses { get; set; }
+    }
+}
+// </snippetSL>
+#else   // SQL Server version with concurrency token
+// <snippet3>
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Department
+    {
+        public int DepartmentID { get; set; }
+
+        [StringLength(50, MinimumLength = 3)]
+        public string Name { get; set; }
+
+        [DataType(DataType.Currency)]
+        [Column(TypeName = "money")]
+        public decimal Budget { get; set; }
+
+        [DataType(DataType.Date)]
+        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}",
+                       ApplyFormatInEditMode = true)]
+        [Display(Name = "Start Date")]
+        public DateTime StartDate { get; set; }
+
+        public int? InstructorID { get; set; }
+
+        [Timestamp]
+        public byte[] ConcurrencyToken { get; set; }
+
+        public Instructor Administrator { get; set; }
+        public ICollection<Course> Courses { get; set; }
+    }
+}
+// </snippet3>
+#endif
+#endif

aspnetcore/data/ef-rp/intro/samples/cu90/Models/Enrollment.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace ContosoUniversity.Models
+{
+    public enum Grade
+    {
+        A, B, C, D, F
+    }
+
+    public class Enrollment
+    {
+        public int EnrollmentID { get; set; }
+        public int CourseID { get; set; }
+        public int StudentID { get; set; }
+        [DisplayFormat(NullDisplayText = "No grade")]
+        public Grade? Grade { get; set; }
+
+        public Course Course { get; set; }
+        public Student Student { get; set; }
+    }
+}

aspnetcore/data/ef-rp/intro/samples/cu90/Models/Instructor.cs

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+//#define BeforeInheritance
+#if BeforeInheritance
+// <snippet_BeforeInheritance>
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Instructor
+    {
+        public int ID { get; set; }
+
+        [Required]
+        [Display(Name = "Last Name")]
+        [StringLength(50)]
+        public string LastName { get; set; }
+
+        [Required]
+        [Column("FirstName")]
+        [Display(Name = "First Name")]
+        [StringLength(50)]
+        public string FirstMidName { get; set; }
+
+        [DataType(DataType.Date)]
+        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
+        [Display(Name = "Hire Date")]
+        public DateTime HireDate { get; set; }
+
+        [Display(Name = "Full Name")]
+        public string FullName
+        {
+            get { return LastName + ", " + FirstMidName; }
+        }
+
+        public ICollection<Course> Courses { get; set; }
+        public OfficeAssignment OfficeAssignment { get; set; }
+    }
+}
+// </snippet_BeforeInheritance>
+#else
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class Instructor : Person
+    {
+        [DataType(DataType.Date)]
+        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
+        [Display(Name = "Hire Date")]
+        public DateTime HireDate { get; set; }
+
+        [Display(Name = "Full Name")]
+        public string FullName
+        {
+            get { return LastName + ", " + FirstMidName; }
+        }
+
+        public ICollection<Course> Courses { get; set; }
+        public OfficeAssignment OfficeAssignment { get; set; }
+    }
+}
+#endif

aspnetcore/data/ef-rp/intro/samples/cu90/Models/OfficeAssignment.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ContosoUniversity.Models
+{
+    public class OfficeAssignment
+    {
+        [Key]
+        public int InstructorID { get; set; }
+        [StringLength(50)]
+        [Display(Name = "Office Location")]
+        public string Location { get; set; }
+
+        public Instructor Instructor { get; set; }
+    }
+}