1

我现在一直在四处寻找。我尝试了几种解决方案，包括捕获 OptimisticConcurrency 并添加：

“@Html.HiddenFor(model => model.OrganizationID)”

到我的删除页面。我的索引（列表）、创建和编辑页面就像一个魅力。但是，当我去删除一行时，它给了我以下错误：

DbUpdateConcurrencyException
存储更新、插入或删除语句影响了意外数量的行 (0)。自加载实体后，实体可能已被修改或删除。刷新 ObjectStateManager 条目。

我按照教程构建了 Database First 应用程序。目前，我只是从我的组织表中引入数据，直到我可以让它顺利运行。我的组织模型如下所示（从“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 Delete 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();
    }
}

在我的索引页面上，它声明了主键：

@Html.ActionLink("Delete", "Delete", new { id=item.OrganizationID })

出于好奇，我决定尝试添加

“@Html.HiddenFor(model => model.OrganizationID)”

到底部，在 BeginForm 下，而不是在字段集和图例标签下的页面顶部：

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

低头看——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——有人可以解释一下吗？

4

1 回答 1

1

当你使用 from 助手时

@using (Html.BeginForm()) {

它吐出以下输出

<form>

</form>

如果要发布隐藏字段，则需要将其放入表单中，否则将不会发布，这就是OrganizationID将0隐藏字段放在表单之外的原因...

于 2012-11-08T06:31:46.033 回答