c# - 谷歌货币转换器

Question

我在过去几年中使用过此代码，但谷歌似乎更改了其中的一些链接。出于某种原因，我收到此错误消息:

"Input string was not in a correct format."

在下一行:

decimal rate = System.Convert.ToDecimal(match.Groups[1].Value);

我的代码:

try
{
    WebClient web = new WebClient();
    string url = string.Format("https://www.google.com/finance/converter?a={2}&from={0}&to={1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);

    string response = web.DownloadString(url);

    Regex regex = new Regex("rhs: \\\"(\\d*.\\d*)");
    Match match = regex.Match(response);
    decimal rate = System.Convert.ToDecimal(match.Groups[1].Value);

    return rate;
}
catch
{
    return 0;
}

Answer 1

您可能不喜欢这种方法，但它已经完成了工作。

WebClient web = new WebClient();
string url = string.Format("https://www.google.com/finance/converter?a={2}&from={0}&to={1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);

string response = web.DownloadString(url);

var split  = response.Split((new string[] { "<span class=bld>"}),StringSplitOptions.None);
var value = split[1].Split(' ')[0];
decimal rate = decimal.Parse(value,CultureInfo.InvariantCulture);