在Windows Form Combobox中的默认值

Question

我在Windows窗体应用程序中创建Combobox我希望在第0个索引处选择“选择”我该怎么办？我试过了

 cbxWeigtType Item = new cbxWeigtType();
 Item.Text = "my string";
 this.DropDownList1.SelectedItem = Item;

Answer 1

你可以这样做：

comboBox1.Items.Insert(0, "Select");
comboBox1.SelectedIndex = 0;

在第0个索引处插入，然后将其设置为selectedIndex。

Answer 2

private void BindComboBoxItem()
{
    ItemRepository repo = new ItemRepository();
    List<Item> items = repo.GetAll();
    List<KeyValuePair<int, string>> allitems = new List<KeyValuePair<int, string>>();
    KeyValuePair<int, string> first = new KeyValuePair<int, string>(0, "Please Select");
    allitems.Add(first);
    foreach (Item item in items)
    {
        KeyValuePair<int, string> obj = new KeyValuePair<int, string>(item.Id, item.Name);
        allitems.Add(obj);
    }
    cbxSelectItem.DataSource = allitems;
    cbxSelectItem.DisplayMember = "Value";
    cbxSelectItem.ValueMember = "Key";
}