添加 @code{ private List BindItems { get; set; } = new List { new SelectedItem{ Text="北京",Value="0"}, new SelectedItem{ Text="上海",Value="1"}, new SelectedItem{ Text="广州",Value="2"}, }; private void AddItem() { BindItems.Add(new SelectedItem($"{BindItems.Count()}", $"城市 {BindItems.Count()}")); } }