如何哈希表绑定到一个下拉列表？ [英] How can a hashtable be bound to a drop down list?

问题描述

在vb.net /的WinForms，怎能一个Hashtable绑定到一个下拉列表或任何其他数据源驱动的控制？

In vb.net / winforms, how can a hashtable be bound to a drop down list or any other datasource-driven control?

推荐答案

这是的WinForms，WPF，或asp.net？ [更新：啊...的WinForms ;-p]

Is this winforms, wpf, or asp.net? [update: ahh... winforms ;-p]

的WinForms想要的数据是的IList （或间接地通过 IListSource ） - 所以我猜（从评论）所使用的WinForms。没有一个内置字典的集合实施的IList ，但说实话这并不重要：如果你是数据绑定，体积大概是相当小的，所以常规列表应该就可以了。

winforms wants data to be IList (or, indirectly, via IListSource) - so I'm guessing (from the comment) that you are using winforms. None of the inbuilt dictionary-like collections implement IList, but to be honest it doesn't matter: if you are data-binding, the volume is probably fairly small, so a regular list should be fine.

最好的办法是像一个名单，其中，T＆GT; 或的BindingList＆LT; T＆GT; ，其中 T 拥有所有你要绑定的属性。这是一个选择吗？如果你被卡住1.1（因为你提到的HashTable ，而不是词典＆LT;，＆GT; ），然后使用的ArrayList 。

The best option is something like a List<T> or BindingList<T>, where T has all the properties you want to bind to. Is this an option? If you are stuck with 1.1 (since you mention HashTable rather than Dictionary<,>), then use ArrayList.

例（在C＃）：​​

class MyData
{
    public int Key { get; set; }
    public string Text { get; set; }
}
[STAThread]
static void Main()
{
    var data = new List<MyData>
    {
        new MyData { Key = 1, Text = "abc"},
        new MyData { Key = 2, Text = "def"},
        new MyData { Key = 3, Text = "ghi"},
    };
    ComboBox cbo = new ComboBox
    {
            DataSource = data,
            DisplayMember = "Text",
            ValueMember = "Key"
    };
    cbo.SelectedValueChanged += delegate {
        Debug.WriteLine(cbo.SelectedValue);
    };
    Application.Run(new Form {Controls = {cbo}});
}

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