通过ADO.Net实体框架将数据插入SQL Compact时出现问题 [英] Problem when inserting data into SQL Compact by ADO.Net Entity Framework

问题描述

        DatabaseEntities de = new DatabaseEntities();
        Income income = de.Incomes.CreateObject();            
        income.Id = de.Incomes.Max(f => f.Id) + 1;            
        income.Person = Users.SelectedValue.ToString();
        income.Value = value;
        income.Unit = Unit.SelectedValue.ToString();
        income.Description = Desc.Text;
        de.Incomes.AddObject(income);
        de.SaveChanges();           

在使用完上述代码段后，我使用了上面的代码段将Income对象插入SQL Compact数据库中下面的语句将数据绑定到DataGridView：

I have used the code section above to insert an Income object into SQL Compact database after that i have used the following statement to bind data to a DataGridView:

        IncomeGridView.DataSource = de.Incomes;

我看到了新数据，但是在关闭程序之后，表中没有看到新数据。有人可以向我解释吗？

I saw the new data but after I closed my program I did not see the new data in table. Can anyone explain me?

推荐答案

可能是这样- http://erikej.blogspot.com/2010/05/faq-why-does-my-changes -not-get-saved.html

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