如何在Blazor客戶端的列表中顯示外鍵名稱

我試圖顯示一門課程的主題名稱，該課程是在客戶端Blazor應用程序中從數據庫驅動的下拉列表中保存該主題的。該值返回為Guid而不是主題名稱。有誰與Blazor完成此任務？在Blazor文檔或任何可以解決我遇到的問題的教程中，我找不到任何內容。這是在Blazor客戶端，我正在使用Entity Framework Core

這是我的課程模型在共享項目中的樣子：

public class Course
    {
        public Guid CourseID { get; set; }

        [Required]
        public string CourseCode { get; set; }

        [Required]
        public string CourseName { get; set; }

        public string CourseSubject { get; set; }

        public string CourseCredits { get; set; }
    } 

這是我的主題模型在共享項目中的樣子：

public class Subject
    {
        public Guid SubjectID { get; set; }

        public string SubjectName { get; set; }
    } 

這是我在Server項目中的CourseData數據訪問模型：

ApplicationDbContext db = new ApplicationDbContext ();

public IEnumerable<Course> GetAllCourses()
        {
            try
            {
                return db.Courses.ToList();
            }
            catch
            {
                throw;
            }
        } 
        public void AddCourse(Course course)
        {
            try
            {
                db.Courses.Add(course);
                db.SaveChanges();
            }
            catch
            {
                throw;
            }
        } 

這是我在Server項目中的SubjectData數據訪問模型：

ApplicationDbContext db = new ApplicationDbContext ();

        public IEnumerable<Subject> GetAllSubjects()
        {
            try
            {
                return db.Subjects.ToList();
            }
            catch
            {
                throw;
            }
        }    
        public void AddSubject(Subject subject)
        {
            try
            {
                db.Subjects.Add(subject);
                db.SaveChanges();
            }
            catch
            {
                throw;
            }
        } 

這是我在Server項目中的課程控制器：

CourseData objcourse = new CourseData();

        [HttpGet]
        [Route("api/Courses/Courses")]
        public IEnumerable<Course> Index()
        {
            return objcourse.GetAllCourses();
        }
        [HttpPost]
        [Route("api/Courses/Create")]
        public void Create([FromBody] Course course)
        {
            if (ModelState.IsValid)
                objcourse.AddCourse(course);
        } 

這是我如何在客戶項目的“課程創建”頁面中保存值的方法：

@page "/Courses/Create"
@inject HttpClient Http
@inject Microsoft.AspNetCore.Components.NavigationManager NavigationManager

<h1>Add Course</h1>
<hr />
<div class="row">
    <div class="col-md-4">
        <div>
            <div class="form-group">
                <label for="CourseCode" class="control-label">Course Code</label>
                <input for="CourseCode" class="form-control" @bind="@course.CourseCode" />
            </div>
            <div class="form-group">
                <label for="CourseName" class="control-label">Course Name</label>
                <input for="CourseName" class="form-control" @bind="@course.CourseName" />
            </div>
            <div class="form-group">
                <label for="CourseSubject" class="control-label">Subject</label>
                <select class="form-control" @bind="@course.CourseSubject">
                    <option></option>
                    @foreach (var subject in subjectList)
                    {
                        <option value="@subject.SubjectID">@subject.SubjectName</option>
                    }
                </select>
            </div>
            <div class="form-group">
                <label for="CourseCredits" class="control-label">Course Credits</label>
                <input for="CourseCredits" class="form-control" @bind="@course.CourseCredits" />
            </div>
            <div class="form-group">
                <button type="submit" class="btn btn-default" @onclick="@CreateCourse">Save</button>
                <button class="btn" @onclick="@cancel">Cancel</button>
            </div>
        </div>
    </div>
</div>
@functions {
    List<Subject> subjectList = new List<Subject>();

    Course course = new Course();

    protected override async Task OnInitializedAsync()
    {
        subjectList = await Http.GetJsonAsync<List<Subject>>("api/Subjects/Subjects");
    }

    protected async Task CreateCourse()
    {
        await Http.SendJsonAsync(HttpMethod.Post, "/api/Courses/Create", course);
        NavigationManager.NavigateTo("/Courses/Courses");
    }

    void cancel()
    {
        NavigationManager.NavigateTo("/Courses/Courses");
    }
} 

最後，這是我的客戶項目中的“課程”列表頁面，它返回主題名稱的Guid，為此，我想顯示主題名稱而不是Guid：

@page "/Courses/Courses"
@inject HttpClient Http
<h1>Courses</h1>
<p>
    <a href="/Courses/Create">Create New</a>
</p>
@if (courseList == null)
{
    <p><em>Loading...</em></p>
}
else
{
    <table class='table'>
        <thead>
            <tr>
                <th>Course Code</th>
                <th>Course Name</th>
                <th>Subject</th>
                <th>Credits</th>
                <th>Actions</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var course in courseList)
            {
                <tr>
                    <td>@course.CourseCode</td>
                    <td>@course.CourseName</td>
                    <td>@course.CourseSubject</td>
                    <td>@course.CourseCredits</td>
                    <td>
                        <a href='/Courses/Edit/@course.CourseID'>Edit</a>  |
                        <a href='/Courses/Delete/@course.CourseID'>Delete</a>
                    </td>
                </tr>

            }
        </tbody>
    </table>
}
@functions {
    Course[] courseList;

    protected override async Task OnInitializedAsync()
    {
        courseList = await Http.GetJsonAsync<Course[]>
        ("/api/Courses/Courses");
    }
} 

根據要求的數據庫上下文：

public class ApplicationDbContext : DbContext
    {
        public virtual DbSet<Course> Courses { get; set; }
        public virtual DbSet<Subject> Subjects { get; set; }
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlServer(@"REMOVED-FOR-SECURITY");
            }
        }
    } 

幫助將不勝感激。