0
我已经创建了一个基于数据库表的列表框,其中列表框的DisplayMember项是通过字符串连接创建的,而ValueMember项表示表中的bigInt PK。列表框被绑定到文本/值对象,如下所示。设置SelectedValue后,C#Listbox值为空
List<ComboSearchItems> csi = new List<ComboSearchItems>();
foreach(var i in q)
{
ComboSearchItems ci = new ComboSearchItems(String.Concat(i.Id, " - ", i.Name, " - ", i.CompanyName), i.Id);
csi.Add(ci);
}
lstCompany.DataSource = csi;
lstCompany.DisplayMember = "Text";
lstCompany.ValueMember = "Value";
lstCompany.SelectedIndex = 0;
lstCompany.Refresh();
public class ComboSearchItems
{
public string Text { get; set; }
public Int64 Value { get; set; }
//Constructor
public ComboSearchItems(string t, Int64 v)
{
Text = t;
Value = v;
}
}
列表框填充和显示正确,但是当我试图通过下面的列表框中的的SelectedValue变化的代码来设置SelectedValue属性为null。
lstCompany.SelectedValue = 16844;