使用数据源添加项组合框
本文关键字:组合 添加 数据源 | 更新日期: 2023-09-27 18:36:12
我有一个方法(LoadCustomers()),它返回一个元素字典,如下所示:
Dictionary<int, string>()
我将其连接到组合框的数据源,如下所示:
Myclass m = new Myclass();
combo1.DataSource = new BindingSource(m.LoadCustomers(), null);
combo1.DisplayMember = "Value";
combo1.ValueMember = "Key";
现在我想在组合框列表的前面放一个项目,例如:
<select one customer>
如何在 WinForms 上的 c# 中执行此操作?
很多
将此选项添加到客户字典
const int EMPTYCUSTOMERKEY = -1; //be sure Customers will not contain this value
const string EMPTYCUSTOMERVALUE = "<select one customer>";
Myclass m = new Myclass();
Dictionary<int, string> customerSource = m.LoadCustomers();
customerSource.Add(EMPTYCUSTOMERKEY, EMPTYCUSTOMERVALUE);
combo1.DataSource = new BindingSource(customerSource, null);
combo1.DisplayMember = "Value";
combo1.ValueMember = "Key";