C#遍历访问Dictionary和HashTable

最新推荐文章于 2023-08-02 23:35:07 发布

转载最新推荐文章于 2023-08-02 23:35:07 发布 · 1k 阅读

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#c# #遍历 #hashtable #dictionary

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本文通过示例对比了C#中Dictionary与Hashtable两种集合类型的使用方式与输出顺序的差异，Dictionary按照添加顺序输出，而Hashtable则不保证顺序。

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一般地Dictionary是按照元素的添加顺序输出的，这和HashTable不同。

Dictionary<int, string> dictionary = new Dictionary<int, string>();
dictionary.Add(1, "xiaowang");
dictionary.Add(21, "dsd");
dictionary.Add(33, "dsfdfd");
dictionary.Add(4, "liusang");

foreach (KeyValuePair<int, string> kvp in dictionary)
{
Console.WriteLine("key={0},value={1}", kvp.Key, kvp.Value);
}

foreach (int j in dictionary.Keys)
{
Console.WriteLine("key={0},value={1}", j, dictionary[j]);
}

Hashtable table = new Hashtable();

table.Add(1, "wang gang");
table.Add(21, "xiao li");
table.Add(33, "xiao fan");
table.Add(4, "fff");

foreach (int i in table.Keys)
{
Console.WriteLine("key={0},value={1}", i, table[i]);
}

foreach (string str in table.Values)
{
Console.WriteLine("value={0}", str);
}

System.Collections.IDictionaryEnumerator d = table.GetEnumerator();
while (d.MoveNext())
{
System.Console.WriteLine("key={0},value={1}",d.Entry.Key,d.Entry.Value);
}

foreach (DictionaryEntry entry in table)
{
Console.WriteLine("key={0},value={1}", entry.Key, entry.Value);
}

Console.ReadLine();

输出结果：

key=1,value=xiaowang
key=21,value=dsd
key=33,value=dsfdfd
key=4,value=liusang
key=1,value=xiaowang
key=21,value=dsd
key=33,value=dsfdfd
key=4,value=liusang
key=21,value=xiao li
key=4,value=fff
key=1,value=wang gang
key=33,value=xiao fan
value=xiao li
value=fff
value=wang gang
value=xiao fan
key=21,value=xiao li
key=4,value=fff
key=1,value=wang gang
key=33,value=xiao fan
key=21,value=xiao li
key=4,value=fff
key=1,value=wang gang
key=33,value=xiao fan