近期开发支付平台的时候有运用到各国的实时汇率之间的转换问题，于是在往上找了很多相关资料，以下就是一些参考网址：
1、提供API接口的网站：https://www.showapi.com；这个网站有提供API的接口，本人换算了下与中国人民银行的汇算率相差不大。1万的换算率相差几块钱。（例：CNY（人民币）-->AUD（澳币））；
该网站提供的汇率换算结果是：1万人民币=1987.5579澳元；
中国人民银行换算结果是：1万人民币=1980.0100澳元；
（这个换算率是比较准确的，我是比较强烈的推荐使用这个API接口，由于个人只做笔记的问题，暂时还没研究这个API;）
2、谷歌汇率网站：http://www.google.com；这个网站我在测试的时候服务器没有连接通无法进行测试，也不清楚汇率到底是否准确。
3、雅虎汇率网站：http://finance.yahoo.com；这篇博客注重写的是这个网站的API接口，希望对大家开发有帮助，不过雅虎毕竟已经被Verizon收购了。服务器也是自然架设在国外，因此每个国家的汇率可能因此不同。测试的时候测试出汇率跟中国人民银行提供的还是差距蛮大的，因此本来是不想写出来的，但毕竟是花了时间编译 的，还是贴出来跟大家共享下。
该网站提供的汇率换算结果是：1万人民币=1940.00澳元；
中国人民银行换算结果是：1万人民币=1980.0100澳元；
看见了吗？差距1万元就会差了40元，oh my god！这个其实比起跨行转账手续费贵多了。所以是不推荐使用，只推荐学习。
准备材料：
1：页面准备：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ccYHOO.aspx.cs" Inherits="ExpressCheckout.ccYHOO" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Realtime Currency Converter ASP.NET Yahoo API</title>
<link rel="stylesheet" href="css/cc.css" />
<script src="JQuery/jquery-1.7.2.min.js" type="text/javascript"></script>
<script src="JQuery/ccYHOO.js" type="text/javascript"></script>
</head>
<body>
<form id="form1" runat="server">
<table class="main">
<tr>
<th colspan="">
Realtime Currency Converter ASP.NET Yahoo API
</th>
</tr>
<tr>
<td>
Convert this amount
</td>
<td>
<input id="txtAmount" maxlength="" size="" value="" class="controls" />
</td>
</tr>
<tr>
<td>
From this currency:
</td>
<td>
<select id="drpFrom" class="controls">
<option value="AED">United Arab Emirates Dirham (AED)</option>
<option value="ANG">Netherlands Antillean Guilder (ANG)</option>
<option value="ARS">Argentine Peso (ARS)</option>
<option value="AUD">Australian Dollar (AUD)</option>
<option value="BDT">Bangladeshi Taka (BDT)</option>
<option value="BGN">Bulgarian Lev (BGN)</option>
<option value="BHD">Bahraini Dinar (BHD)</option>
<option value="BND">Brunei Dollar (BND)</option>
<option value="BOB">Bolivian Boliviano (BOB)</option>
<option value="BRL">Brazilian Real (BRL)</option>
<option value="BWP">Botswanan Pula (BWP)</option>
<option value="CAD">Canadian Dollar (CAD)</option>
<option value="CHF">Swiss Franc (CHF)</option>
<option value="CLP">Chilean Peso (CLP)</option>
<option value="CNY">Chinese Yuan (CNY)</option>
<option value="COP">Colombian Peso (COP)</option>
<option value="CRC">Costa Rican Colón (CRC)</option>
<option value="CZK">Czech Republic Koruna (CZK)</option>
<option value="DKK">Danish Krone (DKK)</option>
<option value="DOP">Dominican Peso (DOP)</option>
<option value="DZD">Algerian Dinar (DZD)</option>
<option value="EEK">Estonian Kroon (EEK)</option>
<option value="EGP">Egyptian Pound (EGP)</option>
<option value="EUR">Euro (EUR)</option>
<option value="FJD">Fijian Dollar (FJD)</option>
<option value="GBP">British Pound Sterling (GBP)</option>
<option value="HKD">* Dollar (HKD)</option>
<option value="HNL">Honduran Lempira (HNL)</option>
<option value="HRK">Croatian Kuna (HRK)</option>
<option value="HUF">Hungarian Forint (HUF)</option>
<option value="IDR">Indonesian Rupiah (IDR)</option>
<option value="ILS">Israeli New Sheqel (ILS)</option>
<option value="INR">Indian Rupee (INR)</option>
<option value="JMD">Jamaican Dollar (JMD)</option>
<option value="JOD">Jordanian Dinar (JOD)</option>
<option value="JPY">Japanese Yen (JPY)</option>
<option value="KES">Kenyan Shilling (KES)</option>
<option value="KRW">South Korean Won (KRW)</option>
<option value="KWD">Kuwaiti Dinar (KWD)</option>
<option value="KYD">Cayman Islands Dollar (KYD)</option>
<option value="KZT">Kazakhstani Tenge (KZT)</option>
<option value="LBP">Lebanese Pound (LBP)</option>
<option value="LKR">Sri Lankan Rupee (LKR)</option>
<option value="LTL">Lithuanian Litas (LTL)</option>
<option value="LVL">Latvian Lats (LVL)</option>
<option value="MAD">Moroccan Dirham (MAD)</option>
<option value="MDL">Moldovan Leu (MDL)</option>
<option value="MKD">Macedonian Denar (MKD)</option>
<option value="MUR">Mauritian Rupee (MUR)</option>
<option value="MVR">Maldivian Rufiyaa (MVR)</option>
<option value="MXN">Mexican Peso (MXN)</option>
<option value="MYR">Malaysian Ringgit (MYR)</option>
<option value="NAD">Namibian Dollar (NAD)</option>
<option value="NGN">Nigerian Naira (NGN)</option>
<option value="NIO">Nicaraguan Córdoba (NIO)</option>
<option value="NOK">Norwegian Krone (NOK)</option>
<option value="NPR">Nepalese Rupee (NPR)</option>
<option value="NZD">New Zealand Dollar (NZD)</option>
<option value="OMR">Omani Rial (OMR)</option>
<option value="PEN">Peruvian Nuevo Sol (PEN)</option>
<option value="PGK">Papua New Guinean Kina (PGK)</option>
<option value="PHP">Philippine Peso (PHP)</option>
<option value="PKR">Pakistani Rupee (PKR)</option>
<option value="PLN">Polish Zloty (PLN)</option>
<option value="PYG">Paraguayan Guarani (PYG)</option>
<option value="QAR">Qatari Rial (QAR)</option>
<option value="RON">Romanian Leu (RON)</option>
<option value="RSD">Serbian Dinar (RSD)</option>
<option value="RUB">Russian Ruble (RUB)</option>
<option value="SAR">Saudi Riyal (SAR)</option>
<option value="SCR">Seychellois Rupee (SCR)</option>
<option value="SEK">Swedish Krona (SEK)</option>
<option value="SGD">Singapore Dollar (SGD)</option>
<option value="SKK">Slovak Koruna (SKK)</option>
<option value="SLL">Sierra Leonean Leone (SLL)</option>
<option value="SVC">Salvadoran Colón (SVC)</option>
<option value="THB">Thai Baht (THB)</option>
<option value="TND">Tunisian Dinar (TND)</option>
<option value="TRY">Turkish Lira (TRY)</option>
<option value="TTD">Trinidad and Tobago Dollar (TTD)</option>
<option value="TWD">New * Dollar (TWD)</option>
<option value="TZS">Tanzanian Shilling (TZS)</option>
<option value="UAH">Ukrainian Hryvnia (UAH)</option>
<option value="UGX">Ugandan Shilling (UGX)</option>
<option value="USD">US Dollar (USD)</option>
<option value="UYU">Uruguayan Peso (UYU)</option>
<option value="UZS">Uzbekistan Som (UZS)</option>
<option value="VEF">Venezuelan Bolívar (VEF)</option>
<option value="VND">Vietnamese Dong (VND)</option>
<option value="XOF">CFA Franc BCEAO (XOF)</option>
<option value="YER">Yemeni Rial (YER)</option>
<option value="ZAR">South African Rand (ZAR)</option>
<option value="ZMK">Zambian Kwacha (ZMK)</option>
</select>
</td>
</tr>
<tr>
<td>
To this currency:
</td>
<td>
<select id="drpTo" class="controls">
<option value="AED">United Arab Emirates Dirham (AED)</option>
<option value="ANG">Netherlands Antillean Guilder (ANG)</option>
<option value="ARS">Argentine Peso (ARS)</option>
<option value="AUD">Australian Dollar (AUD)</option>
<option value="BDT">Bangladeshi Taka (BDT)</option>
<option value="BGN">Bulgarian Lev (BGN)</option>
<option value="BHD">Bahraini Dinar (BHD)</option>
<option value="BND">Brunei Dollar (BND)</option>
<option value="BOB">Bolivian Boliviano (BOB)</option>
<option value="BRL">Brazilian Real (BRL)</option>
<option value="BWP">Botswanan Pula (BWP)</option>
<option value="CAD">Canadian Dollar (CAD)</option>
<option value="CHF">Swiss Franc (CHF)</option>
<option value="CLP">Chilean Peso (CLP)</option>
<option value="CNY">Chinese Yuan (CNY)</option>
<option value="COP">Colombian Peso (COP)</option>
<option value="CRC">Costa Rican Colón (CRC)</option>
<option value="CZK">Czech Republic Koruna (CZK)</option>
<option value="DKK">Danish Krone (DKK)</option>
<option value="DOP">Dominican Peso (DOP)</option>
<option value="DZD">Algerian Dinar (DZD)</option>
<option value="EEK">Estonian Kroon (EEK)</option>
<option value="EGP">Egyptian Pound (EGP)</option>
<option value="EUR">Euro (EUR)</option>
<option value="FJD">Fijian Dollar (FJD)</option>
<option value="GBP">British Pound Sterling (GBP)</option>
<option value="HKD">* Dollar (HKD)</option>
<option value="HNL">Honduran Lempira (HNL)</option>
<option value="HRK">Croatian Kuna (HRK)</option>
<option value="HUF">Hungarian Forint (HUF)</option>
<option value="IDR">Indonesian Rupiah (IDR)</option>
<option value="ILS">Israeli New Sheqel (ILS)</option>
<option value="INR">Indian Rupee (INR)</option>
<option value="JMD">Jamaican Dollar (JMD)</option>
<option value="JOD">Jordanian Dinar (JOD)</option>
<option value="JPY">Japanese Yen (JPY)</option>
<option value="KES">Kenyan Shilling (KES)</option>
<option value="KRW">South Korean Won (KRW)</option>
<option value="KWD">Kuwaiti Dinar (KWD)</option>
<option value="KYD">Cayman Islands Dollar (KYD)</option>
<option value="KZT">Kazakhstani Tenge (KZT)</option>
<option value="LBP">Lebanese Pound (LBP)</option>
<option value="LKR">Sri Lankan Rupee (LKR)</option>
<option value="LTL">Lithuanian Litas (LTL)</option>
<option value="LVL">Latvian Lats (LVL)</option>
<option value="MAD">Moroccan Dirham (MAD)</option>
<option value="MDL">Moldovan Leu (MDL)</option>
<option value="MKD">Macedonian Denar (MKD)</option>
<option value="MUR">Mauritian Rupee (MUR)</option>
<option value="MVR">Maldivian Rufiyaa (MVR)</option>
<option value="MXN">Mexican Peso (MXN)</option>
<option value="MYR">Malaysian Ringgit (MYR)</option>
<option value="NAD">Namibian Dollar (NAD)</option>
<option value="NGN">Nigerian Naira (NGN)</option>
<option value="NIO">Nicaraguan Córdoba (NIO)</option>
<option value="NOK">Norwegian Krone (NOK)</option>
<option value="NPR">Nepalese Rupee (NPR)</option>
<option value="NZD">New Zealand Dollar (NZD)</option>
<option value="OMR">Omani Rial (OMR)</option>
<option value="PEN">Peruvian Nuevo Sol (PEN)</option>
<option value="PGK">Papua New Guinean Kina (PGK)</option>
<option value="PHP">Philippine Peso (PHP)</option>
<option value="PKR">Pakistani Rupee (PKR)</option>
<option value="PLN">Polish Zloty (PLN)</option>
<option value="PYG">Paraguayan Guarani (PYG)</option>
<option value="QAR">Qatari Rial (QAR)</option>
<option value="RON">Romanian Leu (RON)</option>
<option value="RSD">Serbian Dinar (RSD)</option>
<option value="RUB">Russian Ruble (RUB)</option>
<option value="SAR">Saudi Riyal (SAR)</option>
<option value="SCR">Seychellois Rupee (SCR)</option>
<option value="SEK">Swedish Krona (SEK)</option>
<option value="SGD">Singapore Dollar (SGD)</option>
<option value="SKK">Slovak Koruna (SKK)</option>
<option value="SLL">Sierra Leonean Leone (SLL)</option>
<option value="SVC">Salvadoran Colón (SVC)</option>
<option value="THB">Thai Baht (THB)</option>
<option value="TND">Tunisian Dinar (TND)</option>
<option value="TRY">Turkish Lira (TRY)</option>
<option value="TTD">Trinidad and Tobago Dollar (TTD)</option>
<option value="TWD">New * Dollar (TWD)</option>
<option value="TZS">Tanzanian Shilling (TZS)</option>
<option value="UAH">Ukrainian Hryvnia (UAH)</option>
<option value="UGX">Ugandan Shilling (UGX)</option>
<option value="USD">US Dollar (USD)</option>
<option value="UYU">Uruguayan Peso (UYU)</option>
<option value="UZS">Uzbekistan Som (UZS)</option>
<option value="VEF">Venezuelan Bolívar (VEF)</option>
<option value="VND">Vietnamese Dong (VND)</option>
<option value="XOF">CFA Franc BCEAO (XOF)</option>
<option value="YER">Yemeni Rial (YER)</option>
<option value="ZAR">South African Rand (ZAR)</option>
<option value="ZMK">Zambian Kwacha (ZMK)</option>
</select>
</td>
</tr>
<tr>
<td colspan="" class="center">
<input id="submit" type="button" value="Convert" />
</td>
</tr>
<tr class="result">
<td colspan="" id="results" class="center">
Result: ..........
</td>
</tr>
</table>
</form>
</body>
</html>
2：后台不需要写任何代码，完全是通过JS调用Webservice的;
3：需要添加两个关键的JS文件（ccYHOO.js和jquery-1.7.2.min.js）;
4：如果页面需要好看的话，那就多引用一个CSS文件；(css.cs);
这是下载地址： http://files.cnblogs.com/files/BarryJames/JQuery.zip（3-4的文件都在里面可自行下载）。
5：准备Webservice:代码如下
using System.Net;
using System.Text.RegularExpressions;
using System.Web.Script.Services;
namespace CurrencyConverter
{
/// <summary>
/// Summary description for WebService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[ScriptService]
public class WebService : System.Web.Services.WebService
{
[WebMethod]
public decimal ConvertYHOO(decimal amount, string fromCurrency, string toCurrency)
{
WebClient web = new WebClient();
string url = string.Format("http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={0}{1}=X", fromCurrency.ToUpper(), toCurrency.ToUpper());
string response = web.DownloadString(url);
string[] values = Regex.Split(response, ",");
decimal rate = System.Convert.ToDecimal(values[]);
return rate * amount;
}
}
}
准备工作完成之后就可以开始调试了，调试的页面结果如下：