Question

我正在尝试使用ASP MVC从ViewModel向数据库添加记录。该代码仅允许添加某些模型。其他人抛出异常：

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。刷新ObjectStateManager条目。

查看型号：

public class FamilyApplicationViewModel
{
    public FamilyApplicationViewModel()
    {

    }
    public int ID { get; set; }
    public Family Family { get; set; }
    public FamilyApp FamilyApp { get; set; }
    public List<FamilyIncome> FamilyIncomes { get; set; }
    public List<FamilyMember> FamilyMembers { get; set;}
}

获取控制器：

    public ActionResult Create()
    {
        return View();
    }

此控制器有效：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";
    model.Family.CreatedBy = user;
    model.Family.ModifiedBy = user;
    //all other props set in view

    var fam = db.Families.Add(model.Family);

    db.SaveChanges();
    return RedirectToAction("Index");
}

此控制器没有：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";
    model.Family.CreatedBy = user;
    model.Family.ModifiedBy = user;

    var app = new FamilyApp();

    app.AppYear = DateTime.Now.Year;
    app.ModifiedBy = user;
    app.CreatedBy = user;
    // other family app props set

    model.Family.FamilyApps.Add(app);

    db.Families.Add(model.Family);
    db.SaveChanges();
}

此控制器没有：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";
    model.Family.CreatedBy = user;
    model.Family.ModifiedBy = user;

    var fam = db.Families.Add(model.Family);

    db.SaveChanges();

    model.FamilyApp.AppYear = DateTime.Now.Year;
    model.FamilyApp.ModifiedBy = user;
    model.FamilyApp.CreatedBy = user;

    var app = model.FamilyApp;

    model.FamilyApp.FamilyId = fam.FamilyId;

    db.FamilyApps.Add(app);
    db.SaveChanges(); ///////Exception Here///////
}

此控制器没有：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";
    model.Family.CreatedBy = user;
    model.Family.ModifiedBy = user;

    model.FamilyApp.AppYear = DateTime.Now.Year;
    model.FamilyApp.ModifiedBy = user;
    model.FamilyApp.CreatedBy = user;

    var app = model.FamilyApp;

    model.Family.FamilyApps.Add(app);
    db.Families.Add(model.Family);
    db.SaveChanges(); ///////Exception Here///////
}

此控制器没有：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";

    model.FamilyApp.AppYear = DateTime.Now.Year;
    model.FamilyApp.ModifiedBy = user;
    model.FamilyApp.CreatedBy = user;
    model.FamilyApp.FamilyId = 1; //this does exist in db

    db.FamilyApps.Add(model.FamilyApp);
    db.SaveChanges(); ///////Exception Here///////
}

此控制器没有：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";

    model.FamilyApp.AppYear = DateTime.Now.Year;
    model.FamilyApp.ModifiedBy = user;
    model.FamilyApp.CreatedBy = user;
    model.FamilyApp.FamilyId = 1; //this does exist in db

    db.FamilyApps.Add(model.FamilyApp);

    try
    {
        db.SaveChanges();
    }
    catch
    {
        ((IObjectContextAdapter)db).ObjectContext.Refresh(RefreshMode.ClientWins, db.Families);
        ((IObjectContextAdapter)db).ObjectContext.Refresh(RefreshMode.ClientWins, db.FamilyApps);
        db.SaveChanges(); ///////Exception Here///////
    }
}

我还看到另一个显示为db.Refresh的Refresh方法，但我无法使用。

我已经研究过：

这些链接都没有帮助。我已经尝试过将隐藏字段添加到我的视图中。

@Html.HiddenFor(m => m.ID);
@Html.HiddenFor(m => m.Family.FamilyId);
@Html.HiddenFor(m => m.FamilyApp.FamilyAppId);
@for (int i = 0; i < 10; i++)
{
    @Html.HiddenFor(m => m.FamilyIncomes[i].FamilyIncomeId);
    @Html.HiddenFor(m => m.FamilyMembers[i].FamilyMemberId);
}

有谁知道如何修复此异常？

Answer 1

我相信您正在寻找的正确方法是这样的： （请注意，我在stackoverflow上写了这个，但没有运行代码）

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(FamilyApplicationViewModel model)
{
    var user = "Sam";
    model.Family.CreatedBy = user;
    model.Family.ModifiedBy = user;

    model.Family.FamilyApp = new FamilyApp();        

    model.Family.FamilyApp.AppYear = DateTime.Now.Year;
    model.Family.FamilyApp.ModifiedBy = user;
    model.Family.FamilyApp.CreatedBy = user;

    db.Family.Add(model.Family);
    db.SaveChanges();
}

如果我是正确的，Family和FamilyApp有一对一的关系。您可以轻松创建整个对象结构，然后添加＆＃34; root＆＃34;对象，或者只是其中一个对象，也应该添加其他对象。

Answer 2

我通过将EF版本从5更新到6来解决此问题。

＆＃34;存储更新，插入或删除语句影响了意外的行数（0）。＆＃34;

2 个答案: