c#遍历HashTable

 foreach (System.Collections.DictionaryEntry objDE in objHasTab)
{
    Console.WriteLine(objDE.Key.ToString());
    Console.WriteLine(objDE.Value.ToString());
}

System.Collections.IDictionaryEnumerator enumerator = objHashTablet.GetEnumerator();
while (enumerator.MoveNext())
{
    Console.WriteLine(enumerator.Key);         // Hashtable关健字
    Console.WriteLine(enumerator.Value);      // Hashtable值
}

查看缓存项
    Cache.Insert("key1", "key1");
    Cache.Insert("key2", "key2");
    Cache.Insert("key3", "key3");   
    StringBuilder sb = new StringBuilder();
    sb.Append("缓存中的项数：").Append(Cache.Count.ToString() + "</br>");
    foreach (DictionaryEntry Caches in Cache)
    {
        sb.Append("键：").Append(Caches.Key.ToString());
        sb.Append("值：").Append(Caches.Value.ToString()).Append("</br>");
    }
    Response.Write(sb.ToString());
    Cache.Remove("key1");
    Cache.Remove("key2");
    Cache.Remove("key3");

　　

检索缓存项 
    string cachedString;                                                                 
    cachedString = (string)Cache["CacheItem"];
    if (cachedString == null)
    {                                                                                    
        Response.Write("缓存项不存在，添加！");
        cachedString = "Hello, World.";
        Cache.Insert("CacheItem", cachedString);
    }
说明：
(1) 通过在Cache对象中进行检查来确定该项是否不为null，如果该项存在，则将它分配给变量。否则，重新创建该项，将它添加到缓存中，然后访问它。