asp.net MVC - 代碼第一外鍵讓我輸入任何東西

Question

我很新的MVC和搜索和檢查多個解決方案，但沒有爲我工作。

我有一個使用Code First製作的數據庫。它有3個表格：俱樂部，比賽和回合。每一輪都有幾場比賽。在每場比賽中打2個俱樂部。 Match包含Round的一個外鍵（這很好用）和兩個單獨的Match（主隊和客隊）的多個鍵。

當我使用EF添加MatchesController與視圖並啓動應用程序並嘗試輸入新的匹配時，我有一個從數據庫的下拉列表 - 作品令人驚歎。我想從數據庫中獲得兩個有團隊名稱/ ID的下拉列表，所以我可以選擇參加比賽的球隊，但出於某種原因，我有兩個文本框讓我寫任何東西，就好像FK約束不存在一樣。

我有一個相當的問題，因爲我不知道我在做什麼錯 - 是外鍵？我在瀏覽其他問題時將它編碼爲這樣，但也許我搞砸了？

回合類：

public class Round : IValidatableObject 
{ 

    public int RoundID { get; set; } 

    [Required] 
    public int RoundNumber { get; set; } 

    public virtual ICollection<Match> Matches { get; set; } 
} 

俱樂部等級：

public class Club 
{ 
    public int ClubID { get; set; } 

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

    public virtual ICollection<Match> HomePlays { get; set; } 
    public virtual ICollection<Match> AwayPlays { get; set; } 
} 

匹配類及其DB上下文類：

public class Match 
{ 

    public int MatchId { get; set; } 

    public int HomeClubId { get; set; } 
    public int AwayClubID { get; set; } 

    public virtual Club HomeClub { get; set; } 
    public virtual Club AwayClub { get; set; } 

    [Required] 
    public int RoundId { get; set; } 

    [ForeignKey("RoundId")] 
    [InverseProperty("Matches")] 
    public virtual Round Round { get; set; } 

} 

public class Context : DbContext 
{ 

    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     modelBuilder.Entity<Match>() 
.HasRequired(m => m.HomeClub) 
.WithMany(m => m.HomePlays) 
.HasForeignKey(m => m.HomeClubId) 
.WillCascadeOnDelete(false); 

     modelBuilder.Entity<Match>() 
      .HasRequired(m => m.AwayClub) 
      .WithMany(m => m.AwayPlays) 
      .HasForeignKey(m => m.AwayClubID) 
      .WillCascadeOnDelete(false); 
    } 
} 

再有就是用行動指標和創建產生MatchesController ：

public class MatchesController : Controller 
{ 
    private ApplicationDbContext db = new ApplicationDbContext(); 

    // GET: Matches 
    public ActionResult Index() 
    { 
     var match = db.Match.Include(m => m.Round); 
     return View(match.ToList()); 
    } 

    // GET: Matches/Create 
    public ActionResult Create() 
    { 
     ViewBag.RoundId = new SelectList(db.Round, "RoundID", "RoundID"); 
     return View(); 
    } 

    // POST: Matches/Create 
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598. 
    [HttpPost] 
    [ValidateAntiForgeryToken] 
    public ActionResult Create([Bind(Include = "MatchId,HomeClubId,AwayClubID,Club1Goals,Club2Goals,RoundId")] Match match) 
    { 
     if (ModelState.IsValid) 
     { 
      db.Match.Add(match); 
      db.SaveChanges(); 
      return RedirectToAction("Index"); 
     } 

     ViewBag.RoundId = new SelectList(db.Round, "RoundID", "RoundID", match.RoundId); 
     return View(match); 
    } 
} 

而創建視圖：

@model ProjSty3Exp.Models.Match 

@{ 
ViewBag.Title = "Create"; 
} 

<h2>Create</h2> 

@using (Html.BeginForm()) 
{ 
@Html.AntiForgeryToken() 

<div class="form-horizontal"> 
    <h4>Match</h4> 
    <hr /> 
    @Html.ValidationSummary(true, "", new { @class = "text-danger" }) 
    <div class="form-group"> 
     @Html.LabelFor(model => model.HomeClubId, htmlAttributes: new { @class = "control-label col-md-2" }) 
     <div class="col-md-10"> 
      @Html.EditorFor(model => model.HomeClubId, new { htmlAttributes = new { @class = "form-control" } }) 
      @Html.ValidationMessageFor(model => model.HomeClubId, "", new { @class = "text-danger" }) 
     </div> 
    </div> 

    <div class="form-group"> 
     @Html.LabelFor(model => model.AwayClubID, htmlAttributes: new { @class = "control-label col-md-2" }) 
     <div class="col-md-10"> 
      @Html.EditorFor(model => model.AwayClubID, new { htmlAttributes = new { @class = "form-control" } }) 
      @Html.ValidationMessageFor(model => model.AwayClubID, "", new { @class = "text-danger" }) 
     </div> 
    </div> 

    <div class="form-group"> 
     @Html.LabelFor(model => model.RoundId, "RoundId", htmlAttributes: new { @class = "control-label col-md-2" }) 
     <div class="col-md-10"> 
      @Html.DropDownList("RoundId", null, htmlAttributes: new { @class = "form-control" }) 
      @Html.ValidationMessageFor(model => model.RoundId, "", new { @class = "text-danger" }) 
     </div> 
    </div> 

    <div class="form-group"> 
     <div class="col-md-offset-2 col-md-10"> 
      <input type="submit" value="Create" class="btn btn-default" /> 
     </div> 
    </div> 
</div> 
} 

<div> 
@Html.ActionLink("Back to List", "Index") 
</div> 

Answer 1

在獲取動作方法

public ActionResult Create() 
    { 
     ViewBag.RoundId = new SelectList(db.Round, "RoundID", "RoundID"); 
     ViewBag.AwayClubID = new SelectList(db.Clubs, "ClubID", "ClubID"); 
     ViewBag.HomeClubId = new SelectList(db.Clubs, "ClubID", "ClubID"); 
     return View(); 
    } 

在Razor視圖

更換

@Html.EditorFor(model => model.HomeClubId, new { htmlAttributes = new { @class = "form-control" } }) 

通過

@Html.DropDownList("HomeClubId", null, htmlAttributes: new { @class = "form-control" }) 

更換

@Html.EditorFor(model => model.AwayClubID, new { htmlAttributes = new { @class = "form-control" } }) 

通過

@Html.DropDownList("AwayClubID", null, htmlAttributes: new { @class = "form-control" }) 

POST操作方法

// POST: Matches/Create 
// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
// more details see http://go.microsoft.com/fwlink/?LinkId=317598. 
[HttpPost] 
[ValidateAntiForgeryToken] 
public ActionResult Create([Bind(Include = "MatchId,HomeClubId,AwayClubID,Club1Goals,Club2Goals,RoundId")] Match match) 
{ 
    if (ModelState.IsValid) 
    { 
     db.Match.Add(match); 
     db.SaveChanges(); 
     return RedirectToAction("Index"); 
    } 

    ViewBag.RoundId = new SelectList(db.Round, "RoundID", "RoundID", match.RoundId); 
    ViewBag.AwayClubID = new SelectList(db.Clubs, "ClubID", "ClubID", match.AwayCludId); 
    ViewBag.HomeClubId = new SelectList(db.Clubs, "ClubID", "ClubID", match.HomeClubId); 
    return View(match); 
}