Question

我创建了一个实体评估师，并且有方法可以选择值，显示数据等。现在我想保存数据显示后所做的更改，我有一个名为SAVE的按钮，它将用于保存更改。我无法获得如何保存此实体的更改？

实体名称是Appraiser，我在DAL，BL中创建了get AppriaserDetails等方法，并在aspx.cs中使用它们。

这是我的代码：

 public void UpdateData(Appraiser appId)
    {

        var Appsave = context.Appraisers.FirstOrDefault(App => App.AppraiserId == appId.AppraiserId);
        Appsave.AppraiserName = appId.AppraiserName;
        Appsave.AppraiserPhones = appId.AppraiserPhones;
        Appsave.AppraiserAppraiserCompanyId = appId.AppraiserAppraiserCompanyId;
        Appsave.Address = appId.Address;
        Appsave.City = appId.City;
        Appsave.ProvinceState = appId.ProvinceState;
        Appsave.Email = appId.Email;
        context.SaveChanges();
    }

Answer 1

如果你想插入新记录，那么可以使用

        MyContext.Appraisers.AddObject(appraiserEntityObject);
        MyContext.SaveChanges();

如果有更新

        if (appraiserEntityObject.EntityState == EntityState.Detached)
        {
            // In case of web, we got an existing record back from the browser. That                object is not attached to the context yet.
            MyContext.Appraisers.Attach(appraiserEntityObject);
            MyContext.ObjectStateManager.ChangeObjectState(appraiserEntityObject,  EntityState.Modified);
        }
        MyContext.SaveChanges();

这里MyContext是你的ObjectContext

在Asp.Net中保存实体框架的更改

1 个答案: