在C#中将HashTable转换为Dictionary

Question

如何在C#中将HashTable转换为Dictionary？可能吗？例如,如果我在HashTable中有对象集合,并且如果我想将其转换为具有特定类型的对象的字典,该怎么做？

Answer 1

public static Dictionary<K,V> HashtableToDictionary<K,V> (Hashtable table)
{
   return table
     .Cast<DictionaryEntry> ()
     .ToDictionary (kvp => (K)kvp.Key, kvp => (V)kvp.Value);
}

Answer 2

var table = new Hashtable();

table.Add(1, "a");
table.Add(2, "b");
table.Add(3, "c");


var dict = table.Cast<DictionaryEntry>().ToDictionary(d => d.Key, d => d.Value);

Answer 3

Agent-j 答案的扩展方法版本：

using System.Collections;
using System.Collections.Generic;
using System.Linq;

public static class Extensions {

    public static Dictionary<K,V> ToDictionary<K,V> (this Hashtable table)
    {
       return table
         .Cast<DictionaryEntry> ()
         .ToDictionary (kvp => (K)kvp.Key, kvp => (V)kvp.Value);
    }
}