如何在这段代码中传递 "CourseTitle" 和 "FullName"？

Question

我想传递两个实体的名称而不是 ID， “AppUser”的实体

public class AppUser
{
    public int Id { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public string Password { get; set; }

    public string UserName { get; set; }


    [NotMapped]
    public string FullName => $"{FirstName} {LastName}";

    public virtual ICollection<SelectCourse> SelectCourses { get; set; }
}

“课程”实体

public class Course
    {
        public int Id { get; set; }

        public string CourseName { get; set; }

        public string CourseSubject { get; set; }

        public string Content { get; set; }
        


        public int TeacherId { get; set; }

        public virtual Teacher Teacher { get; set; }



        public int CategoryCourseId { get; set; }

        public CategoryCourse CategoryCourse { get; set; }



        public ICollection<SelectCourse> SelectCourses { get; set; }

    }

以及“SelectCourse”的实体

public class SelectCourse
{
    public int Id { get; set; }



    public AppUser AppUser { get; set; }
   
    public int AppUserId { get; set; }




    public Course Course { get; set; }

    public int CourseId { get; set; }
}

索引页面的代码（这是SelectCourse的索引年龄）

 @model IEnumerable<SelectCourseDto>
    @{
        ViewData["Title"] = "Selected Courses List";
    }

<div class="container-fluid py-4">
    <div class="row">
        <div class="col-12">
            <div class="card">
                <div class="card-header">
                    <p>Selected Courses</p>
                    <a asp-controller="SelectCourse" asp-action="Create" class="btn btn-success">Create</a>
                </div>
                <div class="card-body">
                    <table class="table">
                        <thead>
                            <tr>
                                <th><a asp-controller="SelectCourse" asp-action="OrderByFirstName">Course Title</a></th>
                                <th><a asp-controller="SelectCourse" asp-action="OrderByFirstName">User</a></th>
                                <th></th>
                            </tr>
                        </thead>
                        <tbody>
                            @foreach (var item in Model)
                            {
                                <tr>
                                    
                                    <td>@item.CourseId</td>
                                    <td>@item.AppUserId</td>
                                    <td>
                                        <a asp-controller="SelectCourse" asp-action="Edit" asp-route-id="@item.Id" class="btn btn-primary">Edit</a> |
                                        <a asp-controller="SelectCourse" asp-action="Details" asp-route-id="@item.Id" class="btn btn-warning">Details</a> |
                                        <a asp-controller="SelectCourse" asp-action="Delete" asp-route-id="@item.Id" class="btn btn-danger">Delete</a>
                                    </td>
                                </tr>
                            }
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>
</div>

And this is the Controller 

        [HttpGet]
        public IActionResult Index()
        {
            var results = _selectCourseService.GetAll();

            var resultDtos = results.Select(pr => new SelectCourseDto()
            {
                Id = pr.Id,
                AppUserId = pr.AppUserId,
                CourseId = pr.CourseId
            });


            return View(resultDtos);
        }

....................... 基于上面index[dot]cshtml age的代码，它returns课程的Id和AppUser，我想显示两个实体的名称。

Answer 1

正如 Metro Smurf 所说，您可以添加两个属性来存储两个实体的名称，然后从控制器中获取它们并 return 以查看页面。这可能是最简单的方法。

此外，从你的代码中，AppUser和Course class配置了many to many relationship. So, in the controller, you could load the related entities using the Include method, see Loading Related Data，那么你可以得到一个SelectCourse的列表，其中包含相关的AppUser和Course。

然后，在视图页面中，要显示相关实体的属性，您可以使用导航属性，所以，尝试修改代码如下：

@model IEnumerable<SelectCourse>
...

@foreach (var item in Model)
{
    <tr>
        
        <td>@item.Course.CourseName</td>
        <td>@item.AppUser.UserName</td>
        <td>
            <a asp-controller="SelectCourse" asp-action="Edit" asp-route-id="@item.Id" class="btn btn-primary">Edit</a> |
            <a asp-controller="SelectCourse" asp-action="Details" asp-route-id="@item.Id" class="btn btn-warning">Details</a> |
            <a asp-controller="SelectCourse" asp-action="Delete" asp-route-id="@item.Id" class="btn btn-danger">Delete</a>
        </td>
    </tr>
}

注意：在这种情况下，return模型是SelectCourse，而不是SelectCourseDto。

更多详细信息，请参阅Tutorial: Read related data - ASP.NET MVC with EF Core。

如何在这段代码中传递 "CourseTitle" 和 "FullName"？

How to pass the "CourseTitle" and the "FullName" in this code?

c#

asp.net-core

.net-5

.net-6.0