Question

我一直在寻找一下。我尝试了一些涉及捕获OptimisticConcurrency并添加：

的解决方案

“@ Html.HiddenFor（model =＆gt; model.OrganizationID）”

到我的删除页面。我的索引（列表），创建和编辑页面就像魅力一样。但是，当我去删除一行时，它给出了以下错误：

DbUpdateConcurrencyException
存储更新，插入或删除语句会影响意外行数（0）。自那以后，实体可能已被修改或删除实体已加载。刷新ObjectStateManager条目。

我已经按照教程构建了Database First应用程序。目前，我只是从我的组织表中引入数据，直到我能够顺利运行。我的组织模型看起来像这样（由“添加代码生成项”自动生成）：

//------------------------------------------------------------------------------
// <auto-generated>
//    This code was generated from a template.
//
//    Manual changes to this file may cause unexpected behavior in your application.
//    Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace VAGTC.Models
{
    using System;
    using System.Collections.Generic;

    public partial class Organization
    {
        public Organization()
        {
            this.Contact_Title = new HashSet<Contact_Title>();
            this.Organization_Address = new HashSet<Organization_Address>();
            this.Organization_Business_Type = new HashSet<Organization_Business_Type>();
            this.Organization_Country = new HashSet<Organization_Country>();
            this.Organization_Email = new HashSet<Organization_Email>();
            this.Organization_Membership = new HashSet<Organization_Membership>();
            this.Organization_Notes = new HashSet<Organization_Notes>();
            this.Organization_Phone = new HashSet<Organization_Phone>();
            this.Organization_Website = new HashSet<Organization_Website>();
            this.Contacts = new HashSet<Contact>();
            this.Organization_Industry_Code = new HashSet<Organization_Industry_Code>();
        }

        public int OrganizationID { get; set; }
        public string Name { get; set; }

        public virtual ICollection<Contact_Title> Contact_Title { get; set; }
        public virtual ICollection<Organization_Address> Organization_Address { get; set; }
        public virtual ICollection<Organization_Business_Type> Organization_Business_Type { get; set; }
        public virtual ICollection<Organization_Country> Organization_Country { get; set; }
        public virtual ICollection<Organization_Email> Organization_Email { get; set; }
        public virtual ICollection<Organization_Membership> Organization_Membership { get; set; }
        public virtual ICollection<Organization_Notes> Organization_Notes { get; set; }
        public virtual ICollection<Organization_Phone> Organization_Phone { get; set; }
        public virtual ICollection<Organization_Website> Organization_Website { get; set; }
        public virtual ICollection<Contact> Contacts { get; set; }
        public virtual ICollection<Organization_Industry_Code> Organization_Industry_Code { get; set; }
    }
}

这是我的组织控制器中的删除ActionResult：

//
// GET: /Organization/Delete/5

public ActionResult Delete(int id)
{
    using (var db = new VAGTCEntities())
    {
        return View(db.Organizations.Find(id));
    }
}

//
// POST: /Organization/Delete/5

[HttpPost]
public ActionResult Delete(int id, Organization organization)
{
    try
    {
        // TODO: Add delete logic here
        using (var db = new VAGTCEntities())
        {
            db.Entry(organization).State = System.Data.EntityState.Deleted;
                db.SaveChanges();

        }
            return RedirectToAction("Index");
    }
    catch
    {
        return View();
    }
}

并在我的索引页面上声明主键：

@ Html.ActionLink（“删除”，“删除”，新{id = item.OrganizationID}）

出于好奇，我决定尝试添加

“@ Html.HiddenFor（model =＆gt; model.OrganizationID）”

在BeginForm下面的底部，而不是在fieldset中的页面顶部和legend标签下面：

@using (Html.BeginForm()) {
    <p>
        @Html.HiddenFor(model => model.OrganizationID)
        <input type="submit" value="Delete" /> |
        @Html.ActionLink("Back to List", "Index")
    </p>
}

低，看哪 - 它奏效了。我还想发这个！也许其他人会找到它，它会帮助他们。虽然我不知道100％为什么会这样 - 有人可以解释一下这个问题吗？

Answer 1

当您使用from helper

时

@using (Html.BeginForm()) {

它吐出以下输出

<form>

</form>

如果你想要发布隐藏字段，你需要在表单内部获取它，否则它不会被发布，这就是当你把隐藏字段放在外面时OrganizationID是0的原因形式......

修改数据时出现DbUpdateConcurrencyException

1 个答案: