Question

我正在使用按钮尝试linq to sql查询，但更改未提交。

这是我正在使用的代码：

using (Property_dbDataContext context = new Property_dbDataContext())
        {
            var user = (from a in context.User_profiles
                        where a.user_id == Convert.ToInt32(Request.QueryString["user_id"])
                        select a).FirstOrDefault();


            user.email = _Email.Text;
            user.first_name = _FirstName.Text;
            user.last_name = _LastName.Text;
            user.phone = _Phone.Text;
            user.cell = _Cell.Text;
            user.fax = _Fax.Text;
            user.address = _Address.Text;
            user.zip_code = _ZipCode.Text;
            user.country = _Country.SelectedItem.Text;

            context.SubmitChanges();
         }

Answer 1

您的代码似乎正确无误。我想你错过了别的东西。所以我建议你应该尝试一些调试;
首先确保将代码始终包含在null check中;

if(user !=null)
{
       user.email = _Email.Text;
            user.first_name = _FirstName.Text;
            user.last_name = _LastName.Text;
            user.phone = _Phone.Text;
            user.cell = _Cell.Text;
            user.fax = _Fax.Text;
            user.address = _Address.Text;
            user.zip_code = _ZipCode.Text;
            user.country = _Country.SelectedItem.Text;

            context.User_profiles.Attach(user);
            context.ObjectStateManager.ChangeObjectState(user, EntityState.Modified);
            context.SubmitChanges();
}

其次，出于调试目的，编写一些const字符串值以查看是否真的发布了这样的数据;

user.email = _Email.Text;
            user.first_name = "test1";
            user.last_name = _LastName.Text;
           .........
            context.SubmitChanges();

第三，不要忘记，调试器是你最好的朋友：）

Answer 2

你试过这个吗？

using (Property_dbDataContext context = new Property_dbDataContext())
        {
            var user = (from a in context.User_profiles
                        where a.user_id == Convert.ToInt32(Request.QueryString["user_id"])
                        select a).FirstOrDefault();


            user.email = _Email.Text;
            user.first_name = _FirstName.Text;
            user.last_name = _LastName.Text;
            user.phone = _Phone.Text;
            user.cell = _Cell.Text;
            user.fax = _Fax.Text;
            user.address = _Address.Text;
            user.zip_code = _ZipCode.Text;
            user.country = _Country.SelectedItem.Text;

            context.User_profiles.Attach(user);
            context.ObjectStateManager.ChangeObjectState(user, EntityState.Modified);
            context.SubmitChanges();
         }

使用LINQ to SQL更改（更新）未提交到多个列

2 个答案: