Odata-expand (#12206)

* adding project files

* Upgrate to 2.2 and file ending

* improving grades

aspnetcore/web-api/advanced/odata-advanced/sample/odata-expand/ContosoUniversity.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.AspNetCore.OData" Version="7.1.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.2.3" />
+  </ItemGroup>
+
+</Project>

aspnetcore/web-api/advanced/odata-advanced/sample/odata-expand/Controllers/EnrollmentController.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using ContosoUniversity.Models;
+using ContosoUniversity.ODataValidators;
+using Microsoft.AspNet.OData;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace ContosoUniversity.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class EnrollmentController : ControllerBase
+    {
+        private readonly SchoolContext context;
+        public EnrollmentController(SchoolContext context)
+        {
+            this.context = context;
+        }
+
+        [HttpGet]
+        [MyEnableQuery]
+        public IQueryable<Enrollment> Get() => context.Enrollment;
+    }
+}

aspnetcore/web-api/advanced/odata-advanced/sample/odata-expand/Data/DbInitializer.cs

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+#define Final // Final // or Final // or Intro
+
+#if Intro
+#region snippet_Intro
+using ContosoUniversity.Models;
+using System;
+using System.Linq;
+
+namespace ContosoUniversity.Models
+{
+    public static class DbInitializer
+    {
+        public static void Initialize(SchoolContext context)
+        {
+            // context.Database.EnsureCreated();
+
+            // Look for any students.
+            if (context.Student.Any())
+            {
+                return;   // DB has been seeded
+            }
+
+            var students = new Student[]
+            {
+            new Student{FirstMidName="Carson",LastName="Alexander",EnrollmentDate=DateTime.Parse("2005-09-01")},
+            new Student{FirstMidName="Meredith",LastName="Alonso",EnrollmentDate=DateTime.Parse("2002-09-01")},
+            new Student{FirstMidName="Arturo",LastName="Anand",EnrollmentDate=DateTime.Parse("2003-09-01")},
+            new Student{FirstMidName="Gytis",LastName="Barzdukas",EnrollmentDate=DateTime.Parse("2002-09-01")},
+            new Student{FirstMidName="Yan",LastName="Li",EnrollmentDate=DateTime.Parse("2002-09-01")},
+            new Student{FirstMidName="Peggy",LastName="Justice",EnrollmentDate=DateTime.Parse("2001-09-01")},
+            new Student{FirstMidName="Laura",LastName="Norman",EnrollmentDate=DateTime.Parse("2003-09-01")},
+            new Student{FirstMidName="Nino",LastName="Olivetto",EnrollmentDate=DateTime.Parse("2005-09-01")}
+            };
+            foreach (Student s in students)
+            {
+                context.Student.Add(s);
+            }
+            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}
+            };
+            foreach (Course c in courses)
+            {
+                context.Course.Add(c);
+            }
+            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.D},
+            new Enrollment{StudentID=2,CourseID=2021,Grade=Grade.C},
+            new Enrollment{StudentID=3,CourseID=1050},
+            new Enrollment{StudentID=4,CourseID=1050},
+            new Enrollment{StudentID=4,CourseID=4022,Grade=Grade.D},
+            new Enrollment{StudentID=5,CourseID=4041,Grade=Grade.C},
+            new Enrollment{StudentID=6,CourseID=1045},
+            new Enrollment{StudentID=7,CourseID=3141,Grade=Grade.A},
+            };
+            foreach (Enrollment e in enrollments)
+            {
+                context.Enrollment.Add(e);
+            }
+            context.SaveChanges();
+        }
+    }
+}
+#endregion
+
+#elif Final
+#region snippet_Final
+using System;
+using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using ContosoUniversity.Models;
+
+namespace ContosoUniversity.Data
+{
+    public static class DbInitializer
+    {
+        public static void Initialize(SchoolContext context)
+        {
+            //context.Database.EnsureCreated();
+
+            // Look for any students.
+            if (context.Student.Any())
+            {
+                return;   // DB has been seeded
+            }
+
+            var students = new Student[]
+            {
+                new Student { FirstMidName = "Carson",   LastName = "Alexander",
+                    EnrollmentDate = DateTime.Parse("2010-09-01") },
+                new Student { FirstMidName = "Meredith", LastName = "Alonso",
+                    EnrollmentDate = DateTime.Parse("2012-09-01") },
+                new Student { FirstMidName = "Arturo",   LastName = "Anand",
+                    EnrollmentDate = DateTime.Parse("2013-09-01") },
+                new Student { FirstMidName = "Gytis",    LastName = "Barzdukas",
+                    EnrollmentDate = DateTime.Parse("2012-09-01") },
+                new Student { FirstMidName = "Yan",      LastName = "Li",
+                    EnrollmentDate = DateTime.Parse("2012-09-01") },
+                new Student { FirstMidName = "Peggy",    LastName = "Justice",
+                    EnrollmentDate = DateTime.Parse("2011-09-01") },
+                new Student { FirstMidName = "Laura",    LastName = "Norman",
+                    EnrollmentDate = DateTime.Parse("2013-09-01") },
+                new Student { FirstMidName = "Nino",     LastName = "Olivetto",
+                    EnrollmentDate = DateTime.Parse("2005-09-01") }
+            };
+
+            foreach (Student s in students)
+            {
+                context.Student.Add(s);
+            }
+            context.SaveChanges();
+
+            var instructors = new Instructor[]
+            {
+                new Instructor { FirstMidName = "Kim",     LastName = "Abercrombie",
+                    HireDate = DateTime.Parse("1995-03-11") },
+                new Instructor { FirstMidName = "Fadi",    LastName = "Fakhouri",
+                    HireDate = DateTime.Parse("2002-07-06") },
+                new Instructor { FirstMidName = "Roger",   LastName = "Harui",
+                    HireDate = DateTime.Parse("1998-07-01") },
+                new Instructor { FirstMidName = "Candace", LastName = "Kapoor",
+                    HireDate = DateTime.Parse("2001-01-15") },
+                new Instructor { FirstMidName = "Roger",   LastName = "Zheng",
+                    HireDate = DateTime.Parse("2004-02-12") }
+            };
+
+            foreach (Instructor i in instructors)
+            {
+                context.Instructors.Add(i);
+            }
+            context.SaveChanges();
+
+            var departments = new Department[]
+            {
+                new Department { Name = "English",     Budget = 350000,
+                    StartDate = DateTime.Parse("2007-09-01"),
+                    InstructorID  = instructors.Single( i => i.LastName == "Abercrombie").ID },
+                new Department { Name = "Mathematics", Budget = 100000,
+                    StartDate = DateTime.Parse("2007-09-01"),
+                    InstructorID  = instructors.Single( i => i.LastName == "Fakhouri").ID },
+                new Department { Name = "Engineering", Budget = 350000,
+                    StartDate = DateTime.Parse("2007-09-01"),
+                    InstructorID  = instructors.Single( i => i.LastName == "Harui").ID },
+                new Department { Name = "Economics",   Budget = 100000,
+                    StartDate = DateTime.Parse("2007-09-01"),
+                    InstructorID  = instructors.Single( i => i.LastName == "Kapoor").ID }
+            };
+
+            foreach (Department d in departments)
+            {
+                context.Departments.Add(d);
+            }
+            context.SaveChanges();
+
+            var courses = new Course[]
+            {
+                new Course {CourseID = 1050, Title = "Chemistry",      Credits = 3,
+                    DepartmentID = departments.Single( s => s.Name == "Engineering").DepartmentID
+                },
+                new Course {CourseID = 4022, Title = "Microeconomics", Credits = 3,
+                    DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
+                },
+                new Course {CourseID = 4041, Title = "Macroeconomics", Credits = 3,
+                    DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
+                },
+                new Course {CourseID = 1045, Title = "Calculus",       Credits = 4,
+                    DepartmentID = departments.Single( s => s.Name == "Mathematics").DepartmentID
+                },
+                new Course {CourseID = 3141, Title = "Trigonometry",   Credits = 4,
+                    DepartmentID = departments.Single( s => s.Name == "Mathematics").DepartmentID
+                },
+                new Course {CourseID = 2021, Title = "Composition",    Credits = 3,
+                    DepartmentID = departments.Single( s => s.Name == "English").DepartmentID
+                },
+                new Course {CourseID = 2042, Title = "Literature",     Credits = 4,
+                    DepartmentID = departments.Single( s => s.Name == "English").DepartmentID
+                },
+            };
+
+            foreach (Course c in courses)
+            {
+                context.Courses.Add(c);
+            }
+            context.SaveChanges();
+
+            var officeAssignments = new OfficeAssignment[]
+            {
+                new OfficeAssignment {
+                    InstructorID = instructors.Single( i => i.LastName == "Fakhouri").ID,
+                    Location = "Smith 17" },
+                new OfficeAssignment {
+                    InstructorID = instructors.Single( i => i.LastName == "Harui").ID,
+                    Location = "Gowan 27" },
+                new OfficeAssignment {
+                    InstructorID = instructors.Single( i => i.LastName == "Kapoor").ID,
+                    Location = "Thompson 304" },
+            };
+
+            foreach (OfficeAssignment o in officeAssignments)
+            {
+                context.OfficeAssignments.Add(o);
+            }
+            context.SaveChanges();
+
+            var courseInstructors = new CourseAssignment[]
+            {
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Kapoor").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Harui").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Microeconomics" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Macroeconomics" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Zheng").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Calculus" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Fakhouri").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Trigonometry" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Harui").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Composition" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
+                    },
+                new CourseAssignment {
+                    CourseID = courses.Single(c => c.Title == "Literature" ).CourseID,
+                    InstructorID = instructors.Single(i => i.LastName == "Abercrombie").ID
+                    },
+            };
+
+            foreach (CourseAssignment ci in courseInstructors)
+            {
+                context.CourseAssignments.Add(ci);
+            }
+            context.SaveChanges();
+
+            var enrollments = new Enrollment[]
+            {
+                new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Alexander").ID,
+                    CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID,
+                    Grade = Grade.A
+                },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Alexander").ID,
+                    CourseID = courses.Single(c => c.Title == "Microeconomics" ).CourseID,
+                    Grade = Grade.C
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Alexander").ID,
+                    CourseID = courses.Single(c => c.Title == "Macroeconomics" ).CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                        StudentID = students.Single(s => s.LastName == "Alonso").ID,
+                    CourseID = courses.Single(c => c.Title == "Calculus" ).CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                        StudentID = students.Single(s => s.LastName == "Alonso").ID,
+                    CourseID = courses.Single(c => c.Title == "Trigonometry" ).CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Alonso").ID,
+                    CourseID = courses.Single(c => c.Title == "Composition" ).CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Anand").ID,
+                    CourseID = courses.Single(c => c.Title == "Chemistry" ).CourseID
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Anand").ID,
+                    CourseID = courses.Single(c => c.Title == "Microeconomics").CourseID,
+                    Grade = Grade.B
+                    },
+                new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Barzdukas").ID,
+                    CourseID = courses.Single(c => c.Title == "Chemistry").CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Li").ID,
+                    CourseID = courses.Single(c => c.Title == "Composition").CourseID,
+                    Grade = Grade.B
+                    },
+                    new Enrollment {
+                    StudentID = students.Single(s => s.LastName == "Justice").ID,
+                    CourseID = courses.Single(c => c.Title == "Literature").CourseID,
+                    Grade = Grade.B
+                    }
+            };
+
+            foreach (Enrollment e in enrollments)
+            {
+                var enrollmentInDataBase = context.Enrollment.Where(
+                    s =>
+                            s.Student.ID == e.StudentID &&
+                            s.Course.CourseID == e.CourseID).SingleOrDefault();
+                if (enrollmentInDataBase == null)
+                {
+                    context.Enrollment.Add(e);
+                }
+            }
+            context.SaveChanges();
+        }
+    }
+}
+#endregion
+#endif