您好,我正在使用 Linq to SQl 来绑定(bind)组合框控件。如何在组合框列表的顶部添加项目?
var items = from c in db.Contacts
orderby c.Name ascending
select c;
if (items.ToList().Count > 0)
{
cmb1.BindingContext = new BindingContext();
cmb1.DataSource = items;
cmb1.DisplayMember = "Name";
cmb1.ValueMember = "ID";
}
cmb1.Items.Insert(0, "--Select--");
上面的代码失败了。
最佳答案
一种方法是在绑定(bind)之前将“--Select--”联系人占位符插入到结果中:
var items = (from c in db.Contacts
orderby c.Name ascending
select c).ToList();
items.Insert(0, new Contact { ID = 0, Name = "--Select--" });
cmb1.BindingContext = new BindingContext();
cmb1.DataSource = items;
cmb1.DisplayMember = "Name";
cmb1.ValueMember = "ID";
或者您可以对结果的匿名版本执行相同的操作:
var items = (from c in db.Contacts
orderby c.Name ascending
select new { c.ID, c.Name }).ToList();
items.Insert(0, new { ID = 0, Name = "--Select--" });
cmb1.BindingContext = new BindingContext();
cmb1.DataSource = items;
cmb1.DisplayMember = "Name";
cmb1.ValueMember = "ID";
关于c# - 如何在组合框的顶部插入项目?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5518233/