如何在ASP.NET中获得货币汇率

问题描述

我是dotnet平台的新手......我想知道asp.net中货币兑换率的代码。可以帮助我吗？



我尝试了什么：



这是网络服务代码..它会抛出错误输入字符串格式不正确.. 。或者建议使用不同的代码。

hi I'm new to dotnet platform...I want to know the code for currency exchange rate in asp.net..can any one help me?

What I have tried:

this is web service code..It throws error input string is not in the correct format...or else suggest the different code.

namespace Currency_Exchange
{
    /// <summary>
    /// Summary description for WebService
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
    // [System.Web.Script.Services.ScriptService]
    public class WebService : System.Web.Services.WebService
    {

        [WebMethod]
        public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
        {
            WebClient web = new WebClient();
            string url = string.Format("https://www.google.com/finance/converter?fromCurrency={0}&toCurrency={1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);
            string response = web.DownloadString(url);
            Regex regex = new Regex(@":(?<rhs>.+?),");
            string[] arrDigits = regex.Split(response);
            string rate = arrDigits[3];
            return rate;
        }
    }
}

推荐答案

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

你有金额作为第三个值，但在哪里 {2} ？

You have amount as third value, but where is {2} ?

string url = string.Format("https://www.google.com/finance/converter?from={0}&to={1}&a={2}", "AED", "ANG", 1);
            string response = web.DownloadString(url);
            Regex regex = new Regex("<span class=bld>(.*?)</span>");

            var result = regex.Match(response).Groups[1].Value;

输出：0.4874 ANG



这是HTML标记来自Google转换器，以防你想知道我如何使用正则表达式。

output: 0.4874 ANG

Here is the HTML markup from Google converter, in case you want to know how I come out with the regular expression.

<div id=currency_converter_result>1 AED = <span class=bld>0.4874 ANG</span>

这里有一些例子：

https://www.google.com/finance/converter?from=SGD&to=SKK&a=1

https：// www。 google.com/finance/converter?from=USD&to=CNY&a=100



以下是新的CurrencyConversion方法。

Here are some example :
https://www.google.com/finance/converter?from=SGD&to=SKK&a=1
https://www.google.com/finance/converter?from=USD&to=CNY&a=100

Here is the new CurrencyConversion method will look like.

public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
        {
            WebClient web = new WebClient();
            string url = string.Format("https://www.google.com/finance/converter?from={0}&to={1}&a={2}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);
            string response = web.DownloadString(url);
            Regex regex = new Regex("<span class=bld>(.*?)</span>");

            var result = regex.Match(response).Groups[1].Value;
            return result;
        }

<asp:Label ID="lbl_Amount" runat="server" Text="Amount"></asp:Label>
<asp:TextBox ID="txt_amount" runat="server"></asp:TextBox>

<asp:Label ID="lbl_FromCurrency" runat="server" Text="From Currency"></asp:Label>
<asp:TextBox ID="txt_fromCurrency" runat="server"></asp:TextBox>

<asp:Label ID="lbl_toCurrency" runat="server" Text="To Currency"></asp:Label>
<asp:TextBox ID="txt_ToCurrency" runat="server"></asp:TextBox>
<asp:Label ID="lbl_value" runat="server" Text=""></asp:Label>
<asp:Button ID="Btn_Convert" runat="server" Text="Convert" OnClick="Convert"/>

<asp:Label ID="lblResult" runat="server" Text=""></asp:Label>

.cs /代码背后

.cs/code behind

public string CurrencyConversion(decimal amount, string fromCurrency, string toCurrency)
        {
            WebClient web = new WebClient();
            string url = string.Format("https://www.google.com/finance/converter?from={0}&to={1}&a={2}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);
            string response = web.DownloadString(url);
            Regex regex = new Regex("<span class=bld>(.*?)</span>");

            var result = regex.Match(response).Groups[1].Value;
            return string.Format("{0} {1} = {2}", amount, fromCurrency, result);
        }

        protected void Convert(object sender, EventArgs e)
        {
            lblResult.Text = CurrencyConversion ( decimal.Parse(txt_amount.Text), txt_fromCurrency.Text, txt_ToCurrency.Text);
        }

这篇关于如何在ASP.NET中获得货币汇率的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！