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[英]Error: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key
[英]Error An object with the same key already exists in the ObjectStateManager. with ViewModel
我知道這個錯誤有很多問題,但是我無法解決他們的問題。
所以我得到了錯誤:
InvalidOperationException
具有相同鍵的對象已存在於ObjectStateManager中。
ObjectStateManager無法使用相同的鍵跟蹤多個對象。
我什至不知道哪個鍵是相同的? 我能以某種方式查找它嗎?
我的控制器 :
[HttpPost]
public ActionResult Meeting(ViewModel ViewModel)
{
var ALL = db.Sites.Where(p => p.Content.Any(a => a.Date.CompareTo(DateTime.Now) <= 0)).OrderBy(l => l.Customer.Service).ToList();
//Adding informations that arnt added by user
ViewModel.Changing.LastUpdate = DateTime.Now;
ViewModel.Changing.LastUpdaterId = UpdaterID;
Site current = ViewModel.Changing;
if (ModelState.IsValid)
{
db.Entry(current).State = EntityState.Modified; //Here is the error
db.SaveChanges();
}
//...
}
我的ViewModel
public class ViewModel
{
public managementtool.Models.Site Changing { get; set; }
public int[] AvailableSelected { get; set; }
public int[] RequestedSelected { get; set; }
public string SavedRequested { get; set; }
public List<managementtool.Models.Issue> OpenIssue { get; set; }
public List<managementtool.Models.Issue> ClosedIssue { get; set; }
public managementtool.Models.Site Site { get; set; }
public int ID { get; set; }
}
謝謝您的幫助。
不幸的是,我以前在該操作中使用過站點模型,如下所示:
[HttpPost]
public ActionResult Meeting(ViewModel ViewModel)
{
//The Error appears if the following part isnt commented out -->
//var ALL = db.Sites.Where(p => p.Content.Any(a => a.Date.CompareTo(DateTime.Now) <= 0)).OrderBy(l => l.Customer.Service).ToList();
//Adding informations that arnt added by user
ViewModel.Changing.LastUpdate = DateTime.Now;
ViewModel.Changing.LastUpdaterId = UpdaterID;
Site current = ViewModel.Changing;
if (ModelState.IsValid)
{
db.Entry(current).State = EntityState.Modified; //Here is the error
db.SaveChanges();
}
//...
}
因此,有了第二個鍵,因此ObjectStateManager無法使用同一鍵跟蹤多個對象。
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