如何实现货币转换

Question

我已尝试执行以下代码，但它返回了一个空值。

[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;
}

从下面的代码中，我得到的 val 值为 null。我在这里尝试将 1 美元兑换成 INR。

我也试过这段代码，但出现 403 forbidden 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;

我已经尝试GoogleAPI进行代码转换，但它仍然返回空值。

如何将 1 美元兑换成印度卢比？

[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;
        }

这是货币换算的最终方法。 var 值具有转换后的值。

Answer 1

请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return转换货币

Google 已停止使用 http://www.google.com/ig/calculator?hl=en&q={2}{0}%3D%3F{1}

如何实现货币转换

How to implement currency conversion

c#

asp.net

api

asp.net-mvc

currency