遍历list，字典

        private void Form1_Load(object sender, EventArgs e)
        {
            List<int> ids = new List<int>();
            ids.Add();
            string str = "";
            Array.ForEach(ids.ToArray(), i => str += i + ",");
 
            Dictionary<int, int> IdAndStyle = new Dictionary<int, int>();
            IdAndStyle.Add(, );
            IdAndStyle.Add(, );
 
            foreach (KeyValuePair<int, int> kvp in IdAndStyle)
            {
                str = str + string.Format("ID = {0}, style = {1}；", kvp.Key, kvp.Value);
            }
        }