Hashtable的遍历

两种方法：
1.DictionaryEntry

foreach( DictionaryEntry de in hashTable)
{
console.WriteLine("Key -- {0}; Value --{1}.", de.Key, de.Value);
}

2.IDictionaryEnumerator

Hashtable food = new Hashtable();
IDictionaryEnumerator myEnumerator  = food.GetEnumerator();
while(myEnumerator.MoveNext())
{
       strfoodlist = strfoodlist + "\n\n" + myEnumerator.Key.ToString();
       strfoodlist = strfoodlist + ":\t" +myEnumerator.Value.ToString();
}