Question

所有

我正在尝试在我的模型中保存一个对象列表，当我逐步执行它时，执行着陆

db.Entry(model.Sponsors).State = EntityState.Modified;

然后被抓住了：

实体类型List`1不是当前上下文模型的一部分。

列表在视图模型中声明，数据被拉入视图确定。这是我保存数据时发生的情况。我该如何解决？

包含表单的视图

for (var i = 0; i < Model.Sponsors.Count; i++)
         {
             string sponsorDivId = "sponsorclubname" + i.ToString();
             string deleteLink = "<a class=\"icon delete cosponsor\" data-attr-divid=\""+@sponsorDivId+"\" data-attr-id=" + @Model.Sponsors[i].Id + "></a>";

             <div id="@sponsorDivId">
                 @Html.HiddenFor(x => x.Sponsors[i].Id)
                 <div class="formColumn1"><label for="sponsorclubname1">Sponsor club name</label></div>
                 <div class="formColumn2">@Html.EditorFor(x => x.Sponsors[i].SponsorContactName) 
                     <div class="messageBottom"> 
                         @Html.ValidationMessageFor(model => model.Sponsors[i].SponsorContactName)
                     </div>
                 </div>
                 <div class="formColumn3">@Html.EditorFor(x => x.Sponsors[i].SponsorContactEmail)
                     <div class="messageBottom"> 
                         @Html.ValidationMessageFor(model => model.Sponsors[i].SponsorContactEmail)
                     </div>
                 </div>
                 <div class="formColumn4">@Html.EditorFor(x => x.Sponsors[i].SponsorContactPhone)@(i > 0 ? Html.Raw(deleteLink) : Html.Raw(""))
                     <div class="messageBottom"> 
                         @Html.ValidationMessageFor(model => model.Sponsors[i].SponsorContactPhone)
                     </div>
                 </div>
             </div>
             <div class="clear"></div>

         }

视图模型中列表的声明

public List<NewClubSponsor> Sponsors { get; set; }

执行处理的控制器

    [HttpPost]
    public ActionResult ProcessFormANewClubTeam(FormANewClubTeamViewModel model)
    {
    if (ModelState.IsValid)
    {
        try
        { 
            db.Entry(model.Sponsors).State = EntityState.Modified;
            db.SaveChanges();
        }
        catch (Exception ex)
        {


            {
                var err = "Error: " + ex.ToString();
                Console.WriteLine("Error: "+ err);
            }

        }
     }
    [...]
 }

Answer 1

它的含义是List<NewClubSponsor>不是由您的数据库或代码生成的模型。

您真正想要的是保存个人NewClubSponsor，因此您需要更改每个对象的状态。您还只想更改现有对象的对象状态。你想添加新的。

foreach(var sponser in model.Sponsors)
{
      if(sponser.ID <= 0)
      {
         db.Sponsors.Add(sponser);
      }
      else if(db.Entry(sponser).State == EntityState.Detached)
      {
         db.Sponsors.Attach(sponser);
         db.Entry(sponser).State = EntityState.Modified;
      }

}
db.SaveChanges();

保存对象列表

1 个答案: