ArrayList list = new ArrayList();
        Dictionary<string, string> useragents = new Dictionary<string, string>();

        /// <summary>
        /// 初始化combox
        /// </summary>
        private void InitCbUserAgent()
        {
           
            cbUserAgent.Items.Clear();
            list.Clear();
            useragents.Clear();
            //方法1：
            useragents.Add("IE7", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)");
            useragents.Add("IE8", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)");
            useragents.Add("IE9", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)");
            useragents.Add("IE10", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)");
            useragents.Add("Chrome39.0", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36");
            useragents.Add("Firefox34.0", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0");

            foreach (KeyValuePair<string, string> a in useragents)
            {
                list.Add(a);
            }

            //方法2
          
            //Hashtable myHash = null;
            //myHash = new Hashtable();
            //myHash.Add("JIANBING", "我是中国人1");
            //myHash.Add("CH", "我爱我的祖国2");
            //myHash.Add("U", "你是傻大木3");
            //myHash.Add("M", "我想找个MM谈恋爱4");
            //myHash.Add("MM", "因为我想有人疼爱我5");
            //myHash.Add("MI", "我想要个真心对我好的的女孩6");
            //System.Collections.ArrayList list = new System.Collections.ArrayList();
            //foreach (DictionaryEntry entry in myHash)
            //list.Add(entry);

            //绑定这该死的 下拉列表 
            cbUserAgent.DataSource = list;
            cbUserAgent.DisplayMember = "Key";
            cbUserAgent.ValueMember = "Value";

           //方法三：
            //KeyValuePair<string, string> ukp = new KeyValuePair<string, string>();
            //foreach (string key in useragents.Keys)
            //{
            //    ukp = new KeyValuePair<string, string>(key, useragents[key]);
            //    cbUserAgent.Items.Add(ukp);
            //}

        }