＆＃34;类型＆＃39; System.Data.Entity.Infrastructure.DbUpdateConcurrencyException＆＃39;发生在EntityFramework.dll中但未在用户代码中处理
其他信息：存储更新，插入或删除语句会影响意外的行数（0）。自实体加载后，实体可能已被修改或删除。有关理解和处理乐观并发异常的信息，请参阅http://go.microsoft.com/fwlink/?LinkId=472540。＆＃34;
您好我在尝试编辑系统中的订单时遇到此错误。创建和删除订单工作正常，只有在尝试编辑订单时才会收到此错误。
我简要了解为什么会导致错误，但似乎无法修复错误。
来自系统的代码
编辑方法
// POST: Orders/Edit/5
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(CustomerOrder order)
{
if (ModelState.IsValid)
{
db.Entry(order).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(order);
}
模型
[Bind(Exclude = "Id")]
public class CustomerOrder
{
[ScaffoldColumn(false)]
public int Id { get; set; }
[Required(ErrorMessage = "First Name is required")]
[DisplayName("First Name")]
[StringLength(160)]
public string FirstName { get; set; }
[Required(ErrorMessage = "Last Name is required")]
[DisplayName("Last Name")]
[StringLength(160)]
public string LastName { get; set; }
[Required(ErrorMessage = "Address is required")]
[StringLength(70)]
public string Address { get; set; }
[Required(ErrorMessage = "City is required")]
[StringLength(40)]
public string City { get; set; }
[Required(ErrorMessage = "State is required")]
[StringLength(40)]
public string State { get; set; }
[Required(ErrorMessage = "Postal Code is required")]
[DisplayName("Postal Code")]
[StringLength(10)]
public string PostalCode { get; set; }
[Required(ErrorMessage = "Country is required")]
[StringLength(40)]
public string Country { get; set; }
[Required(ErrorMessage = "Phone is required")]
[StringLength(24)]
public string Phone { get; set; }
[Required(ErrorMessage = "Email Address is required")]
[DisplayName("Email Address")]
[RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}",
ErrorMessage = "Email is is not valid.")]
[DataType(DataType.EmailAddress)]
public string Email { get; set; }
[ScaffoldColumn(false)]
[Column(TypeName = "datetime2")]
public DateTime DateCreated { get; set; }
[ScaffoldColumn(false)]
public Decimal Amount { get; set; }
[ScaffoldColumn(false)]
public string CustomerUserName { get; set; }
[ScaffoldColumn(false)]
public decimal Total { get; set; }
public List<OrderedProduct> Products { get; set; }
public string ToString(CustomerOrder order)
{
StringBuilder bob = new StringBuilder();
bob.Append("<p>Order Information for Order: " + order.Id + "<br>Placed at: " + order.DateCreated + "</p>").AppendLine();
bob.Append("<p>Name: " + order.FirstName + " " + order.LastName + "<br>");
bob.Append("Address: " + order.Address + " " + order.City + " " + order.State + " " + order.PostalCode + "<br>");
bob.Append("Contact: " + order.Email + " " + order.Phone + "</p>");
bob.Append("<br>").AppendLine();
bob.Append("<Table>").AppendLine();
// Display header
string header = "<tr> <th>Item Name</th>" + "<th>Quantity</th>" + "<th>Price</th> <th></th> </tr>";
bob.Append(header).AppendLine();
String output = String.Empty;
try
{
foreach (var item in order.Products)
{
bob.Append("<tr>");
output = "<td>" + item.Product.Name + "</td>" + "<td>" + item.Quantity + "</td>" + "<td>" + item.Quantity * item.Product.Price + "</td>";
bob.Append(output).AppendLine();
Console.WriteLine(output);
bob.Append("</tr>");
}
}
catch (Exception ex)
{
output = "No items ordered.";
}
bob.Append("</Table>");
bob.Append("<b>");
// Display footer
string footer = String.Format("{0,-12}{1,12}\n",
"Total", order.Total);
bob.Append(footer).AppendLine();
bob.Append("</b>");
return bob.ToString();
}
}
}
编辑视图
@model bob.Models.CustomerOrder
@{
ViewBag.Title = "Edit";
}
<h2>Edit</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Order</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.Id)
<div class="form-group">
@Html.LabelFor(model => model.FirstName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.FirstName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.FirstName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.LastName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.LastName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.LastName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Address, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Address, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Address, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.City, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.City, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.City, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.State, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.State, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.State, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.PostalCode, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.PostalCode, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.PostalCode, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Country, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Country, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Country, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Phone, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Phone, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Phone, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
任何帮助都会很棒，因为我即将完成这个网站，并且在完成后会非常高兴。
答案 0 :(得分：1)
[在CustomerOrder类中绑定（排除=＆＃34; Id＆＃34;）]导致您的问题。删除并尝试它。如果有效，请给我反馈