如何实施货币转换

Question

我试图实现下面的代码，但它返回一个空值。

[WebMethod]
public decimal ConvertGOOG(decimal amount, string fromCurrency, string toCurrency)
{
    WebClient web = new WebClient();
    string url = string.Format("http://www.google.com/ig/calculator?hl=en&q={2}{0}%3D%3F{1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);
    string response = web.DownloadString(url);
    Regex regex = new Regex("rhs: \\\"(\\d*.\\d*)");
    var val = regex.Match(response).Groups[1].Value;
    decimal rate = System.Convert.ToDecimal(regex.Match(response).Groups[1].Value);
    return rate;
}

从下面的代码我得到val值为null。在这里，我试图将1美元兑换成INR。

我也试过这段代码，但是获得了403禁止错误。

var request = WebRequest.Create(apiURL);

//Get the Response
var streamReader = new StreamReader(request.GetResponse().GetResponseStream(), System.Text.Encoding.ASCII);

//Grab your converted value (ie 2.45 USD)
var result = Regex.Matches(streamReader.ReadToEnd(), "<span class=\"?bld\"?>([^<]+)</span>")[0].Groups[1].Value;

我曾尝试使用Google API进行代码转换，但仍然返回空值。

如何将1美元转换为INR？

[WebMethod]
        public decimal ConvertGOOG(decimal amount, string fromCurrency, string toCurrency)
        {
            WebClient web = new WebClient();
            string apiURL = String.Format("http://finance.google.com/finance/converter?a={0}&from={1}&to={2}", amount, fromCurrency.ToUpper(), toCurrency.ToUpper());
            string response = web.DownloadString(apiURL);
            var split = response.Split((new string[] { "<span class=bld>" }), StringSplitOptions.None);
            var value = split[1].Split(' ')[0];
            decimal rate = decimal.Parse(value, CultureInfo.InvariantCulture);
            return rate;
        }

这是货币转换的最终方法。 var值具有转换后的值。

Answer 1

请使用以下代码更改您的代码

    [WebMethod]
    public decimal ConvertGOOG(decimal amount, string fromCurrency, string toCurrency)
    {
        WebClient web = new WebClient();
        string apiURL = String.Format("http://finance.google.com/finance/converter?a={0}&from={1}&to={2}", amount, fromCurrency.ToUpper(), toCurrency.ToUpper());
        string response = web.DownloadString(apiURL);
        var split = response.Split((new string[] { "<span class=bld>" }), StringSplitOptions.None);
        var value = split[1].Split(' ')[0];
        decimal rate = decimal.Parse(value, CultureInfo.InvariantCulture);
        return rate;
    }

这将返回转换货币

Google已停止使用 {2} {0}％3D％3F {1}