币种转换汇率获取（实时）

/// <summary>
        /// 汇率转换
        /// </summary>
        /// <param name="Currency">当前币种：CNY</param>
        /// <param name="ToCurrency">目标币种:USD</param>
        /// <returns>汇率</returns>
        public string GetExchangeRate(string Currency, string ToCurrency)
        {

            int Number = 0;
            one:
            string Price = null;
            string url = string.Format("http://hk.finance.yahoo.com/q/bc?s={0}=X&t=5d&l=on&z=m&q=l&c=", Currency + ToCurrency);
            System.Net.WebRequest request = System.Net.WebRequest.Create(url);
            request.Method = "Get";
            request.ContentType = "application/x-www-form-urlencoded";
            try
            {
                using (System.Net.WebResponse response = request.GetResponse())
                {
                    using (System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8))
                    {
                        string str = reader.ReadToEnd();
                        if (!string.IsNullOrEmpty(str))
                            Price = str.Substring(str.IndexOf("<span class="time_rtq_ticker"") + 30, 5);
                    }
                }
            }
            catch (Exception)
            {
                if (Number == 0)
                {
                    Number++;
                    goto one;
                }
            }
            return Price;
        }

　

 /// <summary>
    /// 币种码
    /// </summary>
    enum Currency
    {
        /// <summary> 
        ///澳大利亚元   
        /// </summary>
        AUD,
        /// <summary>
        ///英镑
        /// </summary>
        GBP,
        /// <summary>
        ///欧元
        /// </summary>
        EUR,
        /// <summary>
        ///日元
        /// </summary>
        JPY,
        /// <summary>
        ///瑞士法郎
        /// </summary>
        CHF,
        /// <summary>
        ///美元
        /// </summary>
        USD,
        /// <summary>
        ///阿富汗尼
        /// </summary>
        AFN,
        /// <summary>
        ///阿尔巴尼亚列克
        /// </summary>
        ALL,
        /// <summary>
        ///阿尔及利亚第纳尔
        /// </summary>
        DZD,
        /// <summary>
        ///安哥拉宽扎
        /// </summary>
        AOA,
        /// <summary>
        ///阿根廷比索
        /// </summary>
        ARS,
        /// <summary>
        ///亚美尼亚德拉姆
        /// </summary>
        AMD,
        /// <summary>
        ///阿鲁巴弗罗林
        /// </summary>
        AWG,
        /// <summary>
        ///澳大利亚元
        /// </summary>
        AUD,
        /// <summary>
        ///阿塞拜疆马纳特
        /// </summary>
        AZN,
        /// <summary>
        ///巴哈马元
        /// </summary>
        BSD,
        /// <summary>
        ///巴林第纳尔
        /// </summary>
        BHD,
        /// <summary>
        ///孟加拉塔卡
        /// </summary>
        BDT,
        /// <summary>
        ///巴巴多斯元
        /// </summary>
        BBD,
        /// <summary>
        ///白俄罗斯卢布
        /// </summary>
        BYR,
        /// <summary>
        ///伯利兹元
        /// </summary>
        BZD,
        /// <summary>
        ///百慕大元
        /// </summary>
        BMD,
        /// <summary>
        ///不丹努尔特鲁姆
        /// </summary>
        BTN,
        /// <summary>
        ///玻利维亚币
        /// </summary>
        BOB,
        /// <summary>
        ///波斯尼亚马克
        /// </summary>
        BAM,
        /// <summary>
        ///博茨瓦纳普拉
        /// </summary>
        BWP,
        /// <summary>
        ///巴西里尔
        /// </summary>
        BRL,
        /// <summary>
        ///英镑
        /// </summary>
        GBP,
        /// <summary>
        ///文莱元
        /// </summary>
        BND,
        /// <summary>
        ///保加利亚列弗
        /// </summary>
        BGN,
        /// <summary>
        ///布隆迪法郎
        /// </summary>
        BIF,
        /// <summary>
        ///多哥非洲共同体法郎
        /// </summary>
        XOF,
        /// <summary>
        ///刚果中非共同体法郎
        /// </summary>
        XAF,
        /// <summary>
        ///太平洋法兰西共同体法郎
        /// </summary>
        XPF,
        /// <summary>
        ///柬埔寨瑞尔
        /// </summary>
        KHR,
        /// <summary>
        ///加拿大元
        /// </summary>
        CAD,
        /// <summary>
        ///埃斯库多
        /// </summary>
        CVE,
        /// <summary>
        ///开曼群岛元
        /// </summary>
        KYD,
        /// <summary>
        ///智利比索
        /// </summary>
        CLP,
        /// <summary>
        ///人民币
        /// </summary>
        CNY,
        /// <summary>
        ///哥伦比亚比索/// </summary>
        COP,
        /// <summary>
        ///科摩罗法郎
        /// </summary>
        KMF,
        /// <summary>
        ///刚果法郎
        /// </summary>
        CDF,
        /// <summary>
        ///哥斯达黎加科朗/// </summary>
        CRC,
        /// <summary>
        ///克罗地亚库纳/// </summary>
        HRK,
        /// <summary>
        ///古巴可兑换比索/// </summary>
        CUC,
        /// <summary>
        ///古巴比索
        /// </summary>
        CUP,
        /// <summary>
        ///塞浦路斯镑
        /// </summary>
        CYP,
        /// <summary>
        ///捷克克朗
        /// </summary>
        CZK,
        /// <summary>
        ///丹麦克朗
        /// </summary>
        DKK,
        /// <summary>
        ///吉布提法郎
        /// </summary>
        DJF,
        /// <summary>
        ///多米尼加比索
        /// </summary>
        DOP,
        /// <summary>
        ///东加勒比元
        /// </summary>
        XCD,
        /// <summary>
        ///埃及镑/// </summary>
        EGP,
        /// <summary>
        ///萨尔瓦多科朗
        /// </summary>
        SVC,
        /// <summary>
        ///爱沙尼亚伦尼
        /// </summary>
        EEK,
        /// <summary>
        ///埃塞俄比亚比尔
        /// </summary>
        ETB,
        /// <summary>
        ///欧元
        /// </summary>
        EUR,
        /// <summary>
        ///福克兰群岛镑
        /// </summary>
        FKP,
        /// <summary>
        ///斐济元
        /// </summary>
        FJD,
        /// <summary>
        ///冈比亚达拉西
        /// </summary>
        GMD,
        /// <summary>
        ///格鲁吉亚拉里
        /// </summary>
        GEL,
        /// <summary>
        ///加纳新赛地
        /// </summary>
        GHS,
        /// <summary>
        ///直布罗陀镑
        /// </summary>
        GIP,
        /// <summary>
        ///黄金(盎司)
        /// </summary>
        XAU,
        /// <summary>
        ///危地马拉查尔
        /// </summary>
        GTQ,
        /// <summary>
        ///几内亚法郎
        /// </summary>
        GNF,
        /// <summary>
        ///圭亚那元
        /// </summary>
        GYD,
        /// <summary>
        ///海地古德
        /// </summary>
        HTG,
        /// <summary>
        ///洪都拉斯皮拉
        /// </summary>
        HNL,
        /// <summary>
        ///港币
        /// </summary>
        HKD,
        /// <summary>
        ///匈牙利福林
        /// </summary>
        HUF,
        /// <summary>
        ///冰岛克朗
        /// </summary>
        ISK,
        /// <summary>
        ///印度卢比
        /// </summary>
        INR,
        /// <summary>
        ///印度尼西亚卢比
        /// </summary>
        IDR,
        /// <summary>
        ///伊朗里亚尔
        /// </summary>
        IRR,
        /// <summary>
        ///伊拉克第纳尔
        /// </summary>
        IQD,
        /// <summary>
        ///以色列新谢克尔
        /// </summary>
        ILS,
        /// <summary>
        ///牙买加元
        /// </summary>
        JMD,
        /// <summary>
        ///日元
        /// </summary>
        JPY,
        /// <summary>
        ///约旦第纳尔
        /// </summary>
        JOD,
        /// <summary>
        ///哈萨克斯坦腾格
        /// </summary>
        KZT,
        /// <summary>
        ///肯尼亚先令
        /// </summary>
        KES,
        /// <summary>
        ///科威特第纳尔
        /// </summary>
        KWD,
        /// <summary>
        ///吉尔吉斯斯坦索姆
        /// </summary>
        KGS,
        /// <summary>
        ///老挝基普
        /// </summary>
        LAK,
        /// <summary>
        ///拉脱维亚拉特
        /// </summary>
        LVL,
        /// <summary>
        ///黎巴嫩镑
        /// </summary>
        LBP,
        /// <summary>
        ///莱索托洛蒂
        /// </summary>
        LSL,
        /// <summary>
        ///利比里亚元
        /// </summary>
        LRD,
        /// <summary>
        ///利比亚第纳尔
        /// </summary>
        LYD,
        /// <summary>
        ///立陶宛立特
        /// </summary>
        LTL,
        /// <summary>
        ///澳门元
        /// </summary>
        MOP,
        /// <summary>
        ///马其顿第纳尔
        /// </summary>
        MKD,
        /// <summary>
        ///马达加斯加阿里亚里
        /// </summary>
        MGA,
        /// <summary>
        ///马拉维克瓦查
        /// </summary>
        MWK,
        /// <summary>
        ///马来西亚林吉特
        /// </summary>
        MYR,
        /// <summary>
        ///马尔代夫拉菲亚
        /// </summary>
        MVR,
        /// <summary>
        ///马耳他镑
        /// </summary>
        MTL,
        /// <summary>
        ///毛里塔尼亚乌吉亚
        /// </summary>
        MRO,
        /// <summary>
        ///毛里求斯卢比
        /// </summary>
        MUR,
        /// <summary>
        ///墨西哥比索
        /// </summary>
        MXN,
        /// <summary>
        ///摩尔多瓦列伊 
        /// </summary>
        MDL,
        /// <summary>
        ///蒙古图格里克
        /// </summary>
        MNT,
        /// <summary>
        ///摩洛哥迪拉姆
        /// </summary>
        MAD,
        /// <summary>
        ///莫桑比克美提卡
        /// </summary>
        MZN,
        /// <summary>
        ///缅甸元    
        /// </summary>
        MMK,
        /// <summary>
        ///荷属安的列斯盾
        /// </summary>
        ANG,
        /// <summary>
        ///纳米比亚元
        /// </summary>
        NAD,
        /// <summary>
        ///尼泊尔卢比
        /// </summary>
        NPR,
        /// <summary>
        ///新西兰元  
        /// </summary>
        NZD,
        /// <summary>
        ///尼加拉瓜科多巴
        /// </summary>
        NIO,
        /// <summary>
        ///尼日利亚奈拉 
        /// </summary>
        NGN,
        /// <summary>
        ///南韩元
        /// </summary>
        KPW,
        /// <summary>
        ///挪威克朗
        /// </summary>
        NOK,
        /// <summary>
        ///阿曼里亚尔
        /// </summary>
        OMR,
        /// <summary>
        ///巴基斯坦卢比
        /// </summary>
        PKR,
        /// <summary>
        ///巴拿马巴波亚 
        /// </summary>
        PAB,
        /// <summary>
        ///巴布亚新几内亚基那
        /// </summary>
        PGK,
        /// <summary>
        ///巴拉圭瓜尼
        /// </summary>
        PYG,
        /// <summary>
        ///秘鲁新索尔
        /// </summary>
        PEN,
        /// <summary>
        ///菲律宾比索
        /// </summary>
        PHP,
        /// <summary>
        ///波兰兹罗提
        /// </summary>
        PLN,
        /// <summary>
        ///卡塔尔里亚尔
        /// </summary>
        QAR,
        /// <summary>
        ///罗马尼亚塑胶币
        /// </summary>
        RON,
        /// <summary>
        ///俄罗斯卢布
        /// </summary>
        RUB,
        /// <summary>
        ///卢旺达法郎
        /// </summary>
        RWF,
        /// <summary>
        ///萨摩亚塔拉
        /// </summary>
        WST,
        /// <summary>
        ///圣多美/普林西比   
        /// </summary>
        STD,
        /// <summary>
        ///沙特里亚尔
        /// </summary>
        SAR,
        /// <summary>
        ///塞尔维亚第纳尔
        /// </summary>
        RSD,
        /// <summary>
        ///塞舌尔卢比
        /// </summary>
        SCR,
        /// <summary>
        ///塞拉利昂利昂 
        /// </summary>
        SLL,
        /// <summary>
        ///白银（盎司） 
        /// </summary>
        XAG,
        /// <summary>
        ///新加坡元  
        /// </summary>
        SGD,
        /// <summary>
        ///斯洛伐克克朗 
        /// </summary>
        SKK,
        /// <summary>
        ///斯洛文尼亚拉捷夫  
        /// </summary>
        SIT,
        /// <summary>
        ///所罗门群岛元 
        /// </summary>
        SBD,
        /// <summary>
        ///索马里先令
        /// </summary>
        SOS,
        /// <summary>
        ///南非兰特  
        /// </summary>
        ZAR,
        /// <summary>
        ///北韩元    
        /// </summary>
        KRW,
        /// <summary>
        ///斯里兰卡卢比 
        /// </summary>
        LKR,
        /// <summary>
        ///圣赫勒拿群岛镑
        /// </summary>
        SHP,
        /// <summary>
        ///苏丹第纳尔
        /// </summary>
        SDG,
        /// <summary>
        ///苏里南元
        /// </summary>
        SRD,
        /// <summary>
        ///斯威士兰里兰吉尼  
        /// </summary>
        SZL,
        /// <summary>
        ///瑞典克朗
        /// </summary>
        SEK,
        /// <summary>
        ///瑞士法郎
        /// </summary>
        CHF,
        /// <summary>
        ///叙利亚镑
        /// </summary>
        SYP,
        /// <summary>
        ///台币      
        /// </summary>
        TWD,
        /// <summary>
        ///坦桑尼亚先令 
        /// </summary>
        TZS,
        /// <summary>
        ///泰铢
        /// </summary>
        THB,
        /// <summary>
        ///汤加潘加  
        /// </summary>
        TOP,
        /// <summary>
        ///特立尼达/多巴哥元 
        /// </summary>
        TTD,
        /// <summary>
        ///突尼斯第纳尔
        /// </summary>
        TND,
        /// <summary>
        ///突尼斯新里拉
        /// </summary>
        TRY,
        /// <summary>
        ///土库曼斯坦纳特
        /// </summary>
        TMM,
        /// <summary>
        ///乌干达先令
        /// </summary>
        UGX,
        /// <summary>
        ///乌克兰赫夫米 
        /// </summary>
        UAH,
        /// <summary>
        ///乌拉圭比索
        /// </summary>
        UYU,
        /// <summary>
        ///阿联酋迪拉姆 
        /// </summary>
        AED,
        /// <summary>
        ///瓦努阿图瓦图
        /// </summary>
        VUV,
        /// <summary>
        ///委内瑞拉博利瓦
        /// </summary>
        VEB,
        /// <summary>
        ///越南盾
        /// </summary>
        VND,
        /// <summary>
        ///也门里亚尔
        /// </summary>
        YER,
        /// <summary>
        ///赞比亚克瓦查 
        /// </summary>
        ZMK,
        /// <summary>
        ///津巴布韦元
        /// </summary>
        ZWD
    }