Dictionary<string, int>dic = newDictionary<string, int>();

方法1
foreach (var item in dic)
{
Console.WriteLine(dic.Key + dic.Value);
}
方法2
//KeyValuePair<T,K>
foreach (KeyValuePair<string, int> kv in dic)
{
Console.WriteLine(kv.Key + kv.Value);
}
方法3
//通过键的集合取
foreach (string key indic.Keys)
{
Console.WriteLine(key + list[key]);
}