Question

我想添加一个列，该人提供的项目数量预先感谢

BindingSource bindingSource1 = new BindingSource();

bindingSource1.DataSource = (from l in db.Loans.Where(item => item.Items.Any())
                                         from i in db.Items.Where(loan => loan.Loans.Contains(l))
                                         from p in db.People.Where(person => person.Id == l.PersonId)
                                         select new
                                         {
                                             p.FirstName,
                                             l.LoanId,
                                             i.ItemId,
                                             i.ItemName
                                         }).ToList();


            dataGridView1.DataSource = bindingSource1;

我的结果：

Answer 1

我在网络上找不到任何东西，例如...实际可行的任何东西！所以我编辑了数据库->我在“表格之间”添加了一列，添加了QuantityLoaned

My database

然后我必须对代码进行一些更改，现在看起来像这样：

BindingSource bindingSource1 = new BindingSource();

bindingSource1.DataSource = (from l in db.LoanItems.Where(item => item.Item.LoanItems.Any())
                                         from p in db.People.Where(person => person.Id == l.Loan.PersonId)
                                         orderby l.LoanId ascending
                                         select new
                                         {
                                             p.Id,
                                             p.FirstName,
                                             l.LoanId,
                                             l.Item.ItemId,
                                             Dagenoud = SqlFunctions.DateDiff("Weekday", l.Loan.StartDate, DateTime.Now),
                                             l.QuantityLoaned
                                         }).ToList();


            dataGridView1.DataSource = bindingSource1;

这给了我下一个结果：

My result

如何添加我借出的物品数量栏？

1 个答案: