用户代码未处理DBUpdateConcurrencyException

Question

An exception of type 'System.Data.Entity.Infrastructure.DbUpdateConcurrencyException' occurred in EntityFramework.dll but was not handled in user code

Additional information: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted

Hi I am using code first database implementation and whenever I am trying to edit my document references I get the above error. Code below.

Controller Edit Method

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "DocTitle,RevisionNumber", Exclude = "DocumentID,DocumentAuthor,CreationDate,DocumentStatus")] Document document)
{
    if (ModelState.IsValid)
    {
        db.Entry(document).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(document);
}

Class

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Text;
using System.Linq;
using System.Web;

namespace IP3Latest.Models
{
    public class Document
    {
        [Key]
        [ScaffoldColumn(false)]
        public int DocumentID { get; set; }

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

       [Required]
       [Index("IX_RevisionNumberUnique", 1, IsUnique = true)]
       public int RevisionNumber { get; set; }

       [ScaffoldColumn(false)]
       public string DocumentAuthor { get; set; } 

       [ScaffoldColumn(false)]
       public DateTime CreationDate { get; set; }

       [ScaffoldColumn(false)]
       public string FilePath { get; set; }

       [ScaffoldColumn(false)]
       public string DocumentStatus { get; set; }
    }
}

view

@model IP3Latest.Models.Document

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>


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

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

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

        @Html.HiddenFor(model => model.DocumentID)
        @Html.HiddenFor(model => model.DocumentAuthor)
        @Html.HiddenFor(model => model.CreationDate)
        @Html.HiddenFor(model => model.FilePath)
        @Html.HiddenFor(model => model.DocumentStatus)

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

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

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

Answer 1

Hi I know this may not be the answer others are looking for but I fixed my own problem simply by remaking my project and copying the code over so i'm assuming on of the auto generated properties was causing my problem. Thanks everyone who attempted to help me.