我需要在员工表的技能列中存储多个技能（动态来自技能表）

问题描述 投票：0回答：1

在 ASP.NET Core 8 MVC 中，表单的其余部分是完美的，但在 

Skill
表中的 
Employee
列中存在问题。我想在提交 
Employee
表单时使用复选框存储多种技能。

我在提交时遇到错误：

SqlException：无效的对象名称“EmployeeSkills”。

ApplicationDbContext
：

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions options) : base(options)
    {
    }

    // Model
    public DbSet<Skill> Skill { get; set; }
    public DbSet<State> State { get; set; }
    public DbSet<City> City { get; set; }
    public DbSet<Employee> Employee { get; set; }
    public DbSet<EmployeeSkill> EmployeeSkills { get; set; }

    // ViewModel
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // modelBuilder.Entity<EmployeeViewModel>().HasNoKey();

        modelBuilder.Entity<EmployeeSkill>()
             .HasKey(es => new { es.EmployeeId, es.SkillId });

        modelBuilder.Entity<EmployeeSkill>()
             .HasOne(es => es.Employee)
             .WithMany(e => e.EmployeeSkills)
             .HasForeignKey(es => es.EmployeeId);
 
        modelBuilder.Entity<EmployeeSkill>()
             .HasOne(es => es.Skill)
             .WithMany(s => s.EmployeeSkills)
             .HasForeignKey(es => es.SkillId);
    }
}


Skill
模型类：

public class Skill
{
    [Key]
    public int SkillId { get; set; }
    [Required]
    public string? SkillName { get; set; }

    // Navigation properties
    public ICollection<EmployeeSkill> EmployeeSkills { get; set; } = new List<EmployeeSkill>();
}


Employee
表定义：

CREATE TABLE [dbo].[Employee] 
(
    [EmployeeId] INT IDENTITY (202401, 1) NOT NULL,
    [Name]       NVARCHAR(50)  NULL,
    [Email]      NVARCHAR(50)  NULL,
    [Mobile]     NVARCHAR(50)  NULL,
    [StateId]    INT           NULL,
    [CityId]     INT           NULL,
    [Address]    NVARCHAR(MAX) NULL,
    [Gender]     NVARCHAR(50)  NULL,
    [Skill]      NVARCHAR(MAX) NULL,
    [Profile]    NVARCHAR(MAX) NULL,

    CONSTRAINT [PK_Employee] 
        PRIMARY KEY CLUSTERED ([EmployeeId] ASC),
    CONSTRAINT [FK_Employee_City] 
        FOREIGN KEY ([CityId]) REFERENCES [dbo].[City] ([CityId]),
    CONSTRAINT [FK_Employee_State] 
        FOREIGN KEY ([StateId]) REFERENCES [dbo].[State] ([StateId])
);


Employee
模型类：

public class Employee
{
    [Key]
    public int EmployeeId { get; set; }
    [Required(ErrorMessage = "Name is required")]
    public string? Name { get; set; }
    [Required(ErrorMessage = "Email is required")]
    [EmailAddress(ErrorMessage = "Invalid email")]
    public string? Email { get; set; }
    [Required(ErrorMessage = "Mobile is required")]
    [MaxLength(10, ErrorMessage = "Mobile should be 10 digits")]
    [MinLength(10, ErrorMessage = "Mobile should be 10 digits")]
    public string? Mobile { get; set; }
    [Required(ErrorMessage = "State is required")]
    public int StateId { get; set; }
    [Required(ErrorMessage = "City is required")]
    public int CityId { get; set; }
    [Required(ErrorMessage = "Address is required")]
    public string? Address { get; set; }
    [Required(ErrorMessage = "Gender is required")]
    public string? Gender { get; set; }
    [Required(ErrorMessage = "Skill is required")]
    
    public string? Profile { get; set; }

    // Navigation properties
    [BindNever]
    public State? State { get; set; }
    [BindNever]
    public City? City { get; set; }
    public ICollection<EmployeeSkill> EmployeeSkills { get; set; } = new List<EmployeeSkill>();
}


EmployeeViewModel
：

public class EmployeeViewModel
{
    [Required (ErrorMessage = "Name is required")]
    public string? Name { get; set; }
    [Required(ErrorMessage = "Email is required")]
    [EmailAddress(ErrorMessage = "Invalid email")]
    public string? Email { get; set; }
    [Required(ErrorMessage = "Mobile is required")]
    [MaxLength(10, ErrorMessage = "Mobile should be 10 digits")]
    [MinLength(10, ErrorMessage = "Mobile should be 10 digits")]
    public string? Mobile { get; set; }
    [Required(ErrorMessage = "State is required")]
    public int? StateId { get; set; }
    [Required(ErrorMessage = "City is required")]
    public int? CityId { get; set; }
    [Required(ErrorMessage = "Address is required")]
    public string? Address { get; set; }
    [Required(ErrorMessage = "Gender is required")]
    public string? Gender { get; set; }
    
    public List<int> SelectedSkillIds { get; set; } = new List<int>();
    public string? Profile { get; set; }

    public SelectList? States { get; set; }
    public SelectList? Cities { get; set; }
    public SelectList? Skills { get; set; }
}


EmployeeSkill
表定义：

CREATE TABLE [dbo].[EmployeeSkill] 
(
    [EmployeeId] INT NOT NULL,
    [SkillId]    INT NOT NULL,
    CONSTRAINT [PK_EmployeeSkill] 
        PRIMARY KEY CLUSTERED ([EmployeeId] ASC, [SkillId] ASC),
    CONSTRAINT [FK_EmployeeSkill_Employee] 
        FOREIGN KEY ([EmployeeId]) REFERENCES [dbo].[Employee] ([EmployeeId]),
    CONSTRAINT [FK_EmployeeSkill_Skill] 
        FOREIGN KEY ([SkillId]) REFERENCES [dbo].[Skill] ([SkillId])
);


EmployeeSkill
模型类：

public class EmployeeSkill
{
    public int EmployeeId { get; set; }
    public Employee Employee { get; set; }

    public int SkillId { get; set; }
    public Skill Skill { get; set; }
}


EmployeeController
：

public class EmployeeController : Controller
{
    private readonly ApplicationDbContext _context;
    private readonly IWebHostEnvironment _hostEnvironment;

    public EmployeeController(ApplicationDbContext context, IWebHostEnvironment hostEnvironment)
    {
        _context = context;
        _hostEnvironment = hostEnvironment;
    }

    public IActionResult Index()
    {
        return View();
    }

    // Employee/Create
    [HttpGet]
    public IActionResult Create()
    {
        var employeeViewModel = new EmployeeViewModel
        {
            States = new SelectList(_context.State.ToList(), "StateId", "StateName"),
            Cities = new SelectList(Enumerable.Empty<City>(), "CityId", "CityName"),
            Skills = new SelectList(_context.Skill.ToList(), "SkillId", "SkillName")
        };

        return View(employeeViewModel);
    }

    [HttpPost]
    public async Task<IActionResult> Create(EmployeeViewModel employeeViewModel, IFormFile profileFile)
    {
        // If a state is selected, populate the cities for that state
        if (employeeViewModel.StateId.HasValue)
        {
            employeeViewModel.Cities = new SelectList(_context.City
                .Where(c => c.StateId == employeeViewModel.StateId).ToList(), "CityId", "CityName");
        }
        else
        {
            employeeViewModel.Cities = new SelectList(Enumerable.Empty<City>(), "CityId", "CityName");
        }

        // Re-populate the states dropdown for the view
        employeeViewModel.States = new SelectList(_context.State.ToList(), "StateId", "StateName");

        // Re-populate the skills for the view
        employeeViewModel.Skills = new SelectList(_context.Skill.ToList(), "SkillId", "SkillName");

        if (ModelState.IsValid)
        {
            var existEmployee = await _context.Employee.FirstOrDefaultAsync(e => e.Email == employeeViewModel.Email);
            if (existEmployee != null)
            {
                ModelState.AddModelError("Email", "Email already exist");
                employeeViewModel.States = new SelectList(_context.State.ToList(), "StateId", "StateName");
                employeeViewModel.Cities = new SelectList(_context.City.Where(c => c.StateId == employeeViewModel.StateId).ToList(), "CityId", "CityName");
                employeeViewModel.States = new SelectList(_context.Skill.ToList(), "SkillId", "SkillName");
                return View(employeeViewModel);
            }

            // Handle file upload
            if (profileFile != null)
            {
                string uploadDir = Path.Combine(_hostEnvironment.WebRootPath, "uploads");
                Directory.CreateDirectory(uploadDir);
                string fileName = Guid.NewGuid().ToString() + Path.GetExtension(profileFile.FileName);
                string filePath = Path.Combine(uploadDir, fileName);

                using (var fileStream = new FileStream(filePath, FileMode.Create))
                {
                    await profileFile.CopyToAsync(fileStream);
                }

                employeeViewModel.Profile = fileName; // Store the file name or path
            }

            var employee = new Employee
            {
                Name = employeeViewModel.Name,
                Email = employeeViewModel.Email,
                Mobile = employeeViewModel.Mobile,
                StateId = employeeViewModel.StateId.Value,
                CityId = employeeViewModel.CityId.Value,
                Address = employeeViewModel.Address,
                Gender = employeeViewModel.Gender,
                Profile = employeeViewModel.Profile
            };

            foreach (var skillId in employeeViewModel.SelectedSkillIds)
            {
                employee.EmployeeSkills.Add(new EmployeeSkill { SkillId = skillId });
            }

            _context.Employee.Add(employee);
            await _context.SaveChangesAsync();

            return RedirectToAction("Index");
        }

        // If model is invalid, reload the form with existing states and cities
        employeeViewModel.States = new SelectList(_context.State.ToList(), "StateId", "StateName");
        employeeViewModel.Cities = new SelectList(_context.City.Where(c => c.StateId == employeeViewModel.StateId).ToList(), "CityId", "CityName");
        employeeViewModel.Skills = new SelectList(_context.Skill.ToList(), "SkillId", "SkillName");
        return View(employeeViewModel);
    }
}


Create.cshtml
EmployeeController
视图：

@model Candidate.ViewModel.EmployeeViewModel

@{
    ViewData["Title"] = "Employee Create";
}

<h3 class="text-center pb-3">EMPLOYEE CREATE</h3>

<form asp-controller="Employee" asp-action="Create" method="post" enctype="multipart/form-data">
    
    <div class="form-group">
        <label for="Name">Name</label>
        <input type="text" id="Name" name="Name" class="form-control" value="@Model.Name"/>
        <span asp-validation-for="Name" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="Email">Email</label>
        <input type="email" id="Email" name="Email" class="form-control" value="@Model.Email" />
        <span asp-validation-for="Email" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="Mobile">Mobile</label>
        <input type="number" id="Mobile" name="Mobile" class="form-control" value="@Model.Mobile" />
        <span asp-validation-for="Mobile" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="StateId">State</label>
        <select id="StateId" name="StateId" class="form-control" asp-for="StateId" asp-items="Model.States" onchange="this.form.submit()">
            <option value="">-- Select State --</option>
        </select>
        <span asp-validation-for="StateId" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="CityId">City</label>
        <select id="CityId" name="CityId" class="form-control" asp-for="CityId" asp-items="Model.Cities">
            <option value="">-- Select City --</option>
        </select>
        <span asp-validation-for="CityId" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="Address">Address</label>
        <textarea id="Address" name="Address" class="form-control">@Model.Address</textarea>
        <span asp-validation-for="Address" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="Gender">Gender</label><br />
        <input type="radio" id="Male" name="Gender" value="Male" />
        <label for="Male">Male</label><br />

        <input type="radio" id="Female" name="Gender" value="Female" />
        <label for="Female">Female</label><br />

        <input type="radio" id="Other" name="Gender" value="Other" />
        <label for="Other">Other</label><br />

        <span asp-validation-for="Gender" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label>Skills:</label>
        @foreach (var skill in Model.Skills)
        {
            <div>
                <input type="checkbox" id="[email protected]" name="SelectedSkillIds" value="@skill.Value" />
                <label for="[email protected]">@skill.Text</label>
            </div>
        }
        <span asp-validation-for="SelectedSkillIds" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label for="Profile">Profile Picture</label>
        <input type="file" id="Profile" name="profileFile" class="form-control" />
        <span asp-validation-for="Profile" class="text-danger"></span>
    </div>

    <button type="submit" class="btn btn-primary">Create</button>
</form>

我尝试在

Employee
和
Skill
表之间没有关系，但是在提交时它将匹配并验证
SkillId
，因为想要存储多个
Skill
它将无法工作。

我想在提交时存储多个技能

c# asp.net-core asp.net-core-mvc
1个回答
0
投票

从您提供的代码中我们可以看到，EF默认会生成一张EmployeeSkills表： enter image description here

因此，应该在数据库中配置

EmployeeSkills
，而不是
EmployeeSkill
。表定义如下：

CREATE TABLE [dbo].[EmployeeSkills] (
[EmployeeId] INT NOT NULL,
[SkillId] INT NOT NULL,
CONSTRAINT [PK_EmployeeSkills] PRIMARY KEY CLUSTERED ([EmployeeId] ASC, [SkillId] ASC),
CONSTRAINT [FK_EmployeeSkills_Employee_EmployeeId] FOREIGN KEY ([EmployeeId]) REFERENCES [dbo].[Employee] ([EmployeeId]) ON DELETE CASCADE,
CONSTRAINT [FK_EmployeeSkills_Skill_SkillId] FOREIGN KEY ([SkillId]) REFERENCES [dbo].[Skill] ([SkillId]) ON DELETE CASCADE
);

当我插入相关数据时：

enter image description here

enter image description here

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