我需要在我的应用程序上显示当前汇率。
是否可以从http://www.xe.com（XE 转换器）中检索汇率
在这里我尝试了什么：
public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
{
string Output = "";
string fromCurrency1 = comboBox1.Text;
string toCurrency1 = comboBox2.Text;
decimal amount1 = Convert.ToDecimal(textBox1.Text);
// For other currency symbols see http://finance.yahoo.com/currency-converter/
// Construct URL to query the Yahoo! Finance API
const string urlPattern = "http://finance.yahoo.com/d/quotes.csv?s={0}{1}=X&f=l1";
string url = string.Format(urlPattern, fromCurrency1, toCurrency1);
// Get response as string
string response = new Web().DownloadString(url);
// Convert string to number
decimal exchangeRate =
decimal.P(response, System.Globalization.CultureInfo.InvariantCulture);
// Output the result
Output = (amount1 * exchangeRate).ToString();
textBox2.Text = Output;
return Output;
}
有了这个代码，我没有完整的输出...小数部分不是
显示...
3
是的，XE 提供API，但它是付费的。不允许使用自动工具提取数据。(source)
我试过你的代码，它为我工作。你到底是什么意思the decimal part is not showing？
public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
{
string url = string.Format(urlPattern, fromCurrency, toCurrency);
using (var wc = new Web())
{
var response = wc.DownloadString(url);
decimal exchangeRate = decimal.P(response, CultureInfo.InvariantCulture);
return (amount * exchangeRate).ToString("N3");
}
}
测试代码:
Console.WriteLine($"$ 5 = € {CurrencyConversion(5m, "USD", "EUR")}");
Console.WriteLine($"£ 20 = $ {CurrencyConversion(20m, "GBP", "USD")}");
结果：
$ 5 = € 4,661
£ 20 = $ 25,616
使用 NuGet 获取 Newtonsoft.Json
PM> Install-Package Newtonsoft.Json
代码：
private const string urlPattern = "http://rate-exchange-1.appspot.com/currency?from={0}&to={1}";
public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
{
string url = string.Format(urlPattern, fromCurrency, toCurrency);
using (var wc = new Web())
{
var json = wc.DownloadString(url);
Newtonsoft.Json.Linq.JToken token = Newtonsoft.Json.Linq.JObject.P(json);
decimal exchangeRate = (decimal)token.SelectToken("rate");
return (amount * exchangeRate).ToString();
}
}
本站系公益性非盈利分享网址，本文来自用户投稿，不代表码文网立场，如若转载，请注明出处
![cv人生履历：从零开始，一步步走向成功——[姓名]的职业生涯](/titimg/mwenw_article_thumb_32902.jpg)
评论列表（61条）