实体框架更新在更新记录时显示dbconcurrency？

Question

在我的代码中，更新发生在视图和控制器中。用于创建和更新的相同控制器和视图。创建个人资料工作正常但在更新时显示DbConcurrency异常消息。请帮我找。

异常更新记录时的消息： 存储更新，插入或删除语句影响了意外数量的行（0）。自实体加载后，实体可能已被修改或删除。刷新ObjectStateManager条目。

我更新个人资料页中（Profile.cshtml）

@model Sitecss.Models.Profile 
      @using Microsoft.Web.Helpers; 
@{ 
    ViewBag.Title = "CreateProfile"; 
    Layout = "~/Views/Shared/_HomeLay.cshtml"; 
} 



@{ 
    var GT = new SelectList(new[] { 
     new {ID ="Team DeathMatch", Name="Team DeathMatch"}, 
     new {ID ="Search & Destroy", Name="Search & Destroy"}, 
     new {ID ="Flag Runner", Name="Flag Runner"}, 
     new {ID ="Domination", Name="Domination"}, 
     new {ID ="Kill Confirmed", Name="Kill Confirmed"} 
    },"ID","Name"); 
    var Spec = new SelectList(new []{ 
     new {ID ="Assault", Name="Assault"}, 
     new {ID ="Tactical", Name="Tactical"}, 
     new {ID ="Long-Range Eliminations", Name="Long-Range Eliminations"}, 
     new {ID ="Noob", Name="Noob"} 
    }, "ID", "Name"); 

} 


<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script> 
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script> 


@using (Html.BeginForm("CreateProfile", "Home", FormMethod.Post, new { @encType = "multipart/form-data" })) 
{ 

    <div id="content1"> 
    @Html.ValidationSummary(true) 
<h4>Create a Profile</h4> 

    <div> 
    @Html.LabelFor(m => m.SteamName) 
    </div> 
    <div> 
    @Html.TextBoxFor(m => m.SteamName, new { @class = "wide" }) 
    @Html.ValidationMessageFor(m => m.SteamName) 
    </div> 

    <div> 
    @Html.LabelFor(m =>m.UserImg) 
    </div> 
    <div> 

    <input type="file" name="image" class="image" /> <br /> 
    </div> 

    <div> 
    @Html.LabelFor(m => m.GameType) 
    </div> 
    <div> 
    @Html.DropDownListFor(m => m.GameType, GT, new { @class = "wide" }) 
    @Html.ValidationMessageFor(m => m.GameType) 
    </div> 

    <div> 
    @Html.LabelFor(m => m.Specialist) 
    </div> 
    <div> 
    @Html.DropDownListFor(m => m.Specialist, Spec, new { @class = "wide" }) 
    @Html.ValidationMessageFor(m => m.Specialist) 
    </div> 

    <div> 
    @Html.LabelFor(m => m.FavGun) 
    </div> 
    <div> 
    @Html.TextBoxFor(m => m.FavGun, new { @class = "wide" }) 
    @Html.ValidationMessageFor(m => m.FavGun) 
    </div> 
    <p><input type="submit" class="button" value="Ok" /></p> 
    </div> 
} 

，而我的控制器功能

public ActionResult CreateProfile() 
     { 
      if (db.Profiles.Any(u => u.Username == User.Identity.Name)) 
      { 
       Profile pro = (from usr in db.Profiles where usr.Username == User.Identity.Name select usr).Single(); 
       olf = pro.UserImg; 
       Profile p = db.Profiles.Find(pro.Id); 
       ViewBag.ProfilePic = olf; 
       return View(p); 
      } 
      else 
      { 
       ViewBag.Name = User.Identity.Name; 
       return View(); 
      } 
     } 


    [HttpPost] 
     public ActionResult CreateProfile(Profile m) 
     { 
      WebImage photo = WebImage.GetImageFromRequest(); 

      string newFileName = ""; 
      string thumbs = ""; 
      if (photo != null) 
      { 
       string ext = Path.GetExtension(photo.FileName); 
       newFileName = User.Identity.Name+ ext; 
       thumbs = @"Images/" + newFileName; 
       photo.Resize(width: 120, height: 120, preserveAspectRatio: true, preventEnlarge: true); 
       photo.Save(@"~/"+thumbs); 
       m.UserImg = newFileName; 
      } 

      if (ModelState.IsValid) 
      {  
       if (db.Profiles.Any(u => u.Username == User.Identity.Name)) 
       { 

        db.Entry(m).State = System.Data.EntityState.Modified; 
        db.SaveChanges(); 
        return RedirectToAction("Index"); 

       } 
       else 
       { 
        m.Username = User.Identity.Name; 
        db.Profiles.Add(m); 
        db.SaveChanges(); 
        return RedirectToAction("Index"); 
       } 
      } 
      return View(m); 
     } 

Answer 1

，同时增加断点在我的编辑器的更新语句，我才知道，为了解决这个问题，在更新主键ID = 0我已经在修复了DbConcurrency更新的视图中添加了隐藏字段