Question

Visual Studio 2013，ASP.NEt MVC 5 Identity 请有人帮助我如何通过控制器保存数据库中的信息。让我解释一下......我想要发生以下事情：记录的用户可以更新他的教育信息。在字段中进行更改后，他将按下保存按钮，信息将保存在数据库中。当我使用默认的aspnet用户类这样做时，这工作正常，我采取用户管理器。更新方法和信息已保存，但我无法使用任何其他表。如果有人帮助我，我会非常感激。这是控制器类编辑方法

   public async Task<ActionResult> Edit(string id, Education education)
    {

        if (!User.Identity.IsAuthenticated)
        {
            Response.Redirect("~/Account/Login");
        }

        var db = new ApplicationDbContext();
        var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);

        educationdb.Qualification = education.Qualification;
        educationdb.School = education.School;
        educationdb.SchFrom = education.SchFrom;
        educationdb.SchTo = education.SchTo;
        educationdb.College = education.College;
        educationdb.ClgFrom = education.ClgFrom;
        educationdb.ClgTo = education.ClgTo;
        educationdb.University = education.University;
        educationdb.UniFrom = education.UniTo;
        educationdb.Description = education.Description;


        db.Entry(educationdb).State = System.Data.Entity.EntityState.Modified;
        await db.SaveChangesAsync();
        //return RedirectToAction("Index");
        return View();
    }

这是模型类：

namespace theme1.Models
{
public class Education
{
    public string EducationID { get; set; }

    public string UserID { get; set; }
    public ApplicationUser User { get; set; }

    public string Qualification { get; set; }

    public string School { get; set; }
    [DataType(DataType.Date)]
    public DateTime SchFrom { get; set; }
    [DataType(DataType.Date)]
    public DateTime SchTo { get; set; }

    public string College { get; set; }
    [DataType(DataType.Date)]
    public DateTime ClgFrom { get; set; }
    [DataType(DataType.Date)]
    public DateTime ClgTo { get; set; }

    public string University { get; set; }
    [DataType(DataType.Date)]
    public DateTime UniFrom { get; set; }
    [DataType(DataType.Date)]
    public DateTime UniTo { get; set; }

    public string Description { get; set; }
 }
}

var educationdb = db.Edu.First（u =＆gt; u.EducationID == education.EducationID）;此行给出了一个错误异常详细信息：System.InvalidOperationException：Sequence不包含任何元素

来源错误：第109行：var educationdb = db.Edu.First（u =＆gt; u.EducationID == education.EducationID）;

Answer 1

而不是：

var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);

试试这个：

var educationdb = db.Edu.Where(u => u.EducationID == education.EducationID).FirstOrDefault();

OR

而不是：

var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);

试试这个：

var educationdb = db.Edu.FirstOrDefault(u => u.EducationID == education.EducationID);

Answer 2

我怀疑你在ApplicationContext中错过了DBSet for Education模型。

如果这不能解决问题，请提供ApplicationContext类的代码吗？

Answer 3

我不能评论你与Kartikeya的讨论，因为我不熟悉stackoverflow并缺乏声誉。

但是在你改变了你的lambda之后：

var educationdb = db.Edu.Where(u => u.EducationID == 
education.EducationID).FirstOrDefault();

从您与Kartikeya的讨论听起来您正在考虑创建而不是编辑。你不能编辑不存在的东西。

    // GET: Model
    public ActionResult Create()
    {
         return View();
    }

在MVC 5中，通过右键单击Action并选择“添加视图”并插入所需信息来构建视图非常容易，当您创建视图时，为Create创建post方法： p>

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include ="EducationID, UserId....")] Education education)
    {
        if (ModelState.IsValid)
        {
            //any extra logic you might want

            db.Edu.Add(education);
            db.SaveChanges();

            return RedirectToAction("Index");
        }
    return View(education);
    }

保存数据库控制器类asp.net mvc5标识的更改

3 个答案: