Question

我知道如何将查询中的值分配给ListBox的Display和Value成员：

using (SqlConnection con = new SqlConnection(ReportRunnerConstsAndUtils.CPSConnStr))
{
    using (SqlCommand cmd = new SqlCommand(ReportRunnerConstsAndUtils.SelectUnitsQuery, con))
    {
        cmd.CommandType = CommandType.Text;
        using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
        {
            DataTable dt = new DataTable();
            sda.Fill(dt);
            ((ListBox)checkedListBoxUnits).DataSource = dt;
            ((ListBox)checkedListBoxUnits).DisplayMember = "Unit";
            ((ListBox)checkedListBoxUnits).ValueMember = "Unit";
        }
    }
}

...以及如何将单个值分配给ComboBox，如下所示：

List<String> schedulableWeeks = PlatypusUtils.GetWeekBeginnings(WEEKS_COUNT).ToList();
BindingSource bs = new BindingSource();
bs.DataSource = schedulableWeeks;
comboBoxWeekToSchedule.DataSource = bs;

...但是如何将Dictionary分配给组合框，我的Dictionary的字符串值为Display值，DateTime为ValueMember？我试过这个：

Dictionary<String, DateTime> schedulableWeeks = 
    PlatypusUtils.GetWeekBeginningsDict(WEEKS_TO_OFFER_COUNT);
BindingSource bs = new BindingSource();
bs.DataSource = schedulableWeeks;
comboBoxWeekToSchedule.DataSource = bs;
comboBoxWeekToSchedule.DisplayMember = schedulableWeeks[0];
comboBoxWeekToSchedule.ValueMember = schedulableWeeks[1];

...认为我可以通过Dictionary元素0访问字符串，并通过元素1访问DateTime，但它甚至不编译（“参数1：无法从'int'转换为'string'”） - 两条线的错误信息相同。

Answer 1

您是否尝试过使用toDictionary()？我不确定PlatypusUtils.GetWeekBeginningsDict究竟返回了什么，但我猜这可以解决问题。

Dictionary<String, DateTime> schedulableWeeks = PlatypusUtils.GetWeekBeginningsDict(WEEKS_TO_OFFER_COUNT).ToDictionary(x => x.Key);

也可能是KeyValuePair的绑定源问题：

comboBoxWeekToSchedule.DisplayMember = "Key";
comboBoxWeekToSchedule.ValueMember = "Value";

Answer 2

这样的事情应该有效：

std::signbit

基本上，字典中的每个项目都有一个“键”和一个“值”，因为字典中的每个项目都是BindingSource bs = new BindingSource(); bs.DataSource = schedulableWeeks; comboBoxWeekToSchedule.DataSource = bs; comboBoxWeekToSchedule.DisplayMember = "Key"; comboBoxWeekToSchedule.ValueMember = "Value";

Answer 3

尝试设置组合框的键和值，如下所示：

comboBoxWeekToSchedule.DisplayMember = "Key";
comboBoxWeekToSchedule.ValueMember = "Value";

如何将字典分配给组合框的项目（显示和值成员）？

3 个答案: