绑定到字典的DataGridView

绑定到字典的DataGridView

有两个问题

Dictionary

; 第一个是（如您所发现的）它没有实现必要的

IList

/

IListSource

。第二个原因是，没有对项目的保证顺序（实际上，也没有索引器），这使得无法通过索引（而不是键）进行随机访问。

但是…可能有些烟和镜子是可行的。如下所示：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Windows.Forms;static class Program{    [STAThread]    static void Main()    {        Dictionary<string, decimal> prices = new Dictionary<string, decimal>();        prices.Add("foo", 123.45M);        prices.Add("bar", 678.90M);        Application.EnableVisualStyles();        Form form = new Form();        DataGridView dgv = new DataGridView();        dgv.Dock = DockStyle.Fill;        form.Controls.Add(dgv);        var bl = prices.ToBindingList();        dgv.DataSource = bl;        Button btn = new Button();        btn.Dock = DockStyle.Bottom;        btn.Click += delegate        { prices.Add(new Random().Next().ToString(), 0.1M); bl.Reset();        };        form.Controls.Add(btn);        Application.Run(form);    }    public static DictionaryBindingList<TKey, TValue>        ToBindingList<TKey, TValue>(this IDictionary<TKey, TValue> data)    {        return new DictionaryBindingList<TKey, TValue>(data);    }    public sealed class Pair<TKey, TValue>    {        private readonly TKey key;        private readonly IDictionary<TKey, TValue> data;        public Pair(TKey key, IDictionary<TKey, TValue> data)        { this.key = key; this.data = data;        }        public TKey Key { get { return key; } }        public TValue Value        { get {     TValue value;     data.TryGetValue(key, out value);     return value; } set { data[key] = value; }        }    }    public class DictionaryBindingList<TKey, TValue>        : BindingList<Pair<TKey, TValue>>    {        private readonly IDictionary<TKey, TValue> data;        public DictionaryBindingList(IDictionary<TKey, TValue> data)        { this.data = data; Reset();        }        public void Reset()        { bool oldRaise = RaiseListChangedEvents; RaiseListChangedEvents = false; try {     Clear();     foreach (TKey key in data.Keys)     {         Add(new Pair<TKey, TValue>(key, data));     } } finally {     RaiseListChangedEvents = oldRaise;     ResetBindings(); }        }    }}

请注意，自定义扩展方法的使用完全是可选的，并且可以在C＃2.0等中通过仅使用

newDictionaryBindingList<string,decimal>(prices)

来删除。