C#-对象值正在丢失

我试图通过以下方法将我的对象放入另一个对象：-

for (int i = 0; i < NewTblList.Count; i++)
{
    var ItObj = NewTblList[i];

    InternShip It = new InternShip();
    It.Name = NewTblList[i].Name;
    It.Amount = NewTblList[i].Amount;
    It.CreatedDate = NewTblList[i].CreatedDate;
    It.Descr = NewTblList[i].Descr;
    It.Duration = NewTblList[i].Duration;
    It.ExpiryDate = NewTblList[i].ExpiryDate;
    It.StartDate = NewTblList[i].StartDate;

    It = db.Interns.FirstOrDefault(x => x.ID == ItObj.ID);
    results = UtilityMethods<InternShip, int>.EditEntity(db, It);
}

---

我的“It”价值已丢失。我不知道我做错了什么。请帮忙

您正在用

实习生

数据库中的Id

ItObj.Id

覆盖您的

It

因此，您需要将其更改为：

foreach (var internship in NewTblList)
{
    // get the existing internship from the database
    InternShip It = db.Interns.FirstOrDefault(x => x.ID == internship.ID);

    // update the values from your list
    It.Name = internship.Name;
    It.Amount = internship.Amount;
    It.CreatedDate = internship.CreatedDate;
    It.Descr = internship.Descr;
    It.Duration = internship.Duration;
    It.ExpiryDate = internship.ExpiryDate;
    It.StartDate = internship.StartDate;

    results = UtilityMethods<InternShip, int>.EditEntity(db, It);
}

foreach（在newtbl列表中的var实习）
{
//从数据库中获取现有实习信息
实习It=db.实习生.FirstOrDefault（x=>x.ID==interpaint.ID）；
//更新列表中的值
It.Name=实习.Name；
It.Amount=实习.Amount；
It.CreatedDate=实习.CreatedDate；
It.Descr=实习.Descr；
It.Duration=实习期.Duration；
It.ExpiryDate=实习期。ExpiryDate；
It.StartDate=实习期.StartDate；
结果=效用方法.EditEntity（db，It）；
}

因为您正在用

Interns

数据库中

ItObj.ID

的任何内容覆盖

It

obejct。感谢您的回复。实际上，我正在将新值传递给var ItObj=newtblist[I]；如果我想要一个特定ID的值，那么解决方案是什么？如果您试图用

newbllist

中的新值更新

Interns

，那么移动

It=db.Interns.FirstOrDefault（x=>x.ID==ItObj.ID）行到顶部并删除
实习It=新实习（）哦，正确！！那是一个愚蠢的错误。谢谢你的快速回复。现在可以用了吗？
foreach (var internship in NewTblList)
{
    // get the existing internship from the database
    InternShip It = db.Interns.FirstOrDefault(x => x.ID == internship.ID);

    // update the values from your list
    It.Name = internship.Name;
    It.Amount = internship.Amount;
    It.CreatedDate = internship.CreatedDate;
    It.Descr = internship.Descr;
    It.Duration = internship.Duration;
    It.ExpiryDate = internship.ExpiryDate;
    It.StartDate = internship.StartDate;

    results = UtilityMethods<InternShip, int>.EditEntity(db, It);
}