以下是" C# .net实现货币转换示例"的完整攻略。我们可以按照以下步骤进行:
- 创建一个C# .net项目
首先,在Visual Studio中创建一个C# .net项目。可以创建一个控制台应用程序或Windows窗体应用程序,具体看你需要使用哪种界面来展示货币转换结果。
- 导入外部货币汇率数据
为了实现货币转换,我们需要导入外部货币汇率数据。可以使用一些开源的API,例如Foreign Exchange Rates与OpenExchangeRates等,这些API可以提供实时的货币汇率数据。在这个示例中,我们将使用换算网站提供的CSV格式的货币汇率数据文件来进行示范,例如以下CSV文件:
"CountryCode","Currency","ExchangeRate"
"USD","US Dollar","1"
"EUR","Euro","0.844000"
"GBP","British Pound","0.734000"
"JPY","Japanese Yen","106.794000"
"CNY","Chinese Yuan","6.771000"
可以将此文件读入内存,存储在C# .net的数据结构中,并且使用LINQ进行数据筛选和过滤。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace CurrencyConversionExample
{
class Program
{
static void Main(string[] args)
{
//read CSV file into memory
List<Currency> currencyList = new List<Currency>();
var fileLines = File.ReadAllLines("ExchangeRate.csv");
for (int i = 1; i < fileLines.Length; i++)
{
string[] values = fileLines[i].Split(',');
currencyList.Add(new Currency(values[0], values[1], Double.Parse(values[2])));
}
//filter currency data by country code
var usdCurrency = currencyList.Where(c => c.CountryCode == "USD").FirstOrDefault();
var cnyCurrency = currencyList.Where(c => c.CountryCode == "CNY").FirstOrDefault();
//convert currency
double usdAmount = 100.0;
double cnyAmount = usdAmount * cnyCurrency.ExchangeRate / usdCurrency.ExchangeRate;
Console.WriteLine(cnyAmount.ToString("F"));
Console.ReadLine();
}
}
public class Currency
{
public string CountryCode { get; set; }
public string CurrencyName { get; set; }
public Double ExchangeRate { get; set; }
public Currency(string countryCode, string currencyName, Double exchangeRate)
{
this.CountryCode = countryCode.Replace("\"", "");
this.CurrencyName = currencyName.Replace("\"", "");
this.ExchangeRate = exchangeRate;
}
}
}
在上述代码中,我们首先读入CSV文件,并将其存储在一个名为currencyList的List
- 进行多种货币之间的转换
现在我们已经完成了从USD到CNY的货币转换,但是如何进行不同货币之间的转换呢?我们可以参考以下代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace CurrencyConversionExample
{
class Program
{
static void Main(string[] args)
{
//read CSV file into memory
List<Currency> currencyList = new List<Currency>();
var fileLines = File.ReadAllLines("ExchangeRate.csv");
for (int i = 1; i < fileLines.Length; i++)
{
string[] values = fileLines[i].Split(',');
currencyList.Add(new Currency(values[0], values[1], Double.Parse(values[2])));
}
//convert currency
double fromAmount = 100.0;
double toAmount = ConvertCurrency(currencyList, "USD", "EUR", fromAmount);
Console.WriteLine(toAmount.ToString("F"));
Console.ReadLine();
}
static double ConvertCurrency(List<Currency> currencyList, string fromCurrency, string toCurrency, double amount)
{
//filter currency data by country code
var fromCurrencyData = currencyList.Where(c => c.CountryCode == fromCurrency).FirstOrDefault();
var toCurrencyData = currencyList.Where(c => c.CountryCode == toCurrency).FirstOrDefault();
//convert currency
double toAmount = amount * toCurrencyData.ExchangeRate / fromCurrencyData.ExchangeRate;
return toAmount;
}
}
public class Currency
{
public string CountryCode { get; set; }
public string CurrencyName { get; set; }
public Double ExchangeRate { get; set; }
public Currency(string countryCode, string currencyName, Double exchangeRate)
{
this.CountryCode = countryCode.Replace("\"", "");
this.CurrencyName = currencyName.Replace("\"", "");
this.ExchangeRate = exchangeRate;
}
}
}
这个示例中,我们将ConvertCurrency方法以及汇率计算公式从Main方法中抽离出来,并且接受3个参数:货币列表,转换的源货币,目标货币,以及需要转换的金额。因此,现在我们可以根据需要进行多个货币之间的转换。
总结:
通过以上示例的演示,我们可以实现一个简单的C# .net货币转换功能,包括如下几个步骤:
1.创建C# .net项目
2.导入外部货币汇率数据
3.进行多种货币之间的转换
希望对您有所帮助。
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