KeyValuePair<TKey, TValue>是DictionaryEntry的泛型版本

最新推荐文章于 2022-10-16 10:51:22 发布

albertliangyg

最新推荐文章于 2022-10-16 10:51:22 发布

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本文通过对比Dictionary与HashTable、KeyValuePair与DictionaryEntry，解释了泛型集合与非泛型集合之间的区别，并展示了如何使用这些集合来存储键值对数据。

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如同Dictionary<TKey, TValue>是HashTable的泛型版本一样，KeyValuePair<TKey, TValue>是DictionaryEntry的泛型版本。

Dictionary与HashTable内部是基于hash算法的，而SortedDictionary和SortedList是基于Red Black Tree(红黑树)的。

DictionaryEntry:

	Hashtable openWith = new Hashtable();

        // Add some elements to the hash table. There are no  
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // When you use foreach to enumerate hash table elements, 
        // the elements are retrieved as KeyValuePair objects.
        Console.WriteLine();
        foreach (DictionaryEntry de in openWith)
        {
            Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
        }

KeyValuePair<TKey, TValue>:

	Dictionary<string, string> openWith = 
            new Dictionary<string, string>();

        // Add some elements to the dictionary. There are no  
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");
        foreach( KeyValuePair<string, string> kvp in myDictionary )
        {
            Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
        }

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