Question

我有100个具有id和名称的区域对象我想在组合框中显示名称，并且它们的id是组合框的索引但是这段代码不起作用

private void Areadropdown()//show Areadropdown
    {
        List<Area> list = Area.Dropdown();


        foreach (Area a in list)
        {

          metroComboBox1.Items.Insert(a.Id,a.Areaname);
        }
    }

Answer 1

 List<Area> list = new  List<Area>();

 metroComboBox1.DisplayMember = "PropertyName" //for you want to display in dropdown so give that class property name
 metroComboBox1.ValueMember = "ProprtyName" // use for take  value of those selection 

  metroComboBox1.DataSource = list; //your data list

this code help to solve your problem

FYI 请参考以下示例

  districtComboBox.DisplayMember = "Name";
  districtComboBox.ValueMember = "Id";
  districtComboBox.DataSource = districts.Where(d => d.StateId == (int)stateComboBox.SelectedValue).ToList()

Answer 2

试试这个

使用类中定义的属性名称作为显示成员和成员值

districtComboBox.DisplayMember = "Areaname";
districtComboBox.ValueMember = "Id";

Answer 3

试试这个（使用BindingList）：

private void Areadropdown()
{
  List<Area> list = Area.Dropdown();
  BindingList<Area> areas = new BindingList<Area>(list); 
  metroComboBox1.ValueMember = "Id";
  metroComboBox1.DisplayMember = "Areaname";
  metroComboBox1.DataSource = areas ;
}

在c＃中更改Windows应用程序中的组合框的索引

3 个答案: