Dollar / Euro Currency Exchange Rate Convertor in C# using JSON

These examples are prepared for converting American dollars into Euro currency and vice verca.

Two seperate samples are made for two seperate JSON sources. JSON Objects in both samples will be different from each other.

Step 1: As the first stage, for analyzing (processing) the JSON files, I constitude the NeWTON library as follows:

Step 2: Add Newtonsoft.Json reference in “using”.


using System;
using System.Net;
using Newtonsoft.Json;

using System;

using System.Net;

using Newtonsoft.Json;

Step3: Choose the currency we want to convert from the address below:

http://www.floatrates.com/json-feeds.html

I choose ” Dollar” because I want to convert dollars into other currencies

http://www.floatrates.com/daily/usd.json

Step 4: code writings and explanations:

You can see all currencies in the dynamic “currency” object


string url = "http://www.floatrates.com/daily/usd.json";
string json = new WebClient().DownloadString(url);
var currency = JsonConvert.DeserializeObject<dynamic>(json);

string url = "http://www.floatrates.com/daily/usd.json";

string json = new WebClient().DownloadString(url);

var currency = JsonConvert.DeserializeObject<dynamic>(json);

Printing “currency” object will be sufficient for seeing all currencies


Console.WriteLine(currency);

Console.WriteLine(currency);

To Read the Euro currency rate, you must write the first line of following code (currency.eur.rate).
if you also want to convert Euro to Dollar ,you must write the second line of following code (currency.eur.inverseRate).


Console.WriteLine(currency.eur.rate);
Console.WriteLine(currency.eur.inverseRate);

Console.WriteLine(currency.eur.rate);

Console.WriteLine(currency.eur.inverseRate);

Sample Application 1: If we want to show the code in a simple console application, we can do the following.


using System;
using System.Net;
using Newtonsoft.Json;


namespace currencyexample
{
    class Program
    {
       static void Main(string[] args)
       {
            double amount, curAmount;
            int exchangeType;
            string url = "http://www.floatrates.com/daily/usd.json";
            string json = new WebClient().DownloadString(url);
            var currency = JsonConvert.DeserializeObject<dynamic>(json);
            

            Console.Write("Enter Your Amount:");
            amount = Convert.ToSingle(Console.ReadLine());
            Console.Write("\nPress(1) for Dollar->Euro \nPress(2) for Euro->Dollar \nEnter exchange type: ");
            exchangeType = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("*************************");
            if(exchangeType==1)
            {
                curAmount = amount * Convert.ToSingle(currency.eur.rate);
                Console.WriteLine("{0:N2}{1}", curAmount,currency.eur.code);
            }
            else if(exchangeType == 2)
            {
                curAmount = amount * Convert.ToSingle(currency.eur.inverseRate);
                Console.WriteLine("{0:N2}{1}", curAmount, "USD");
            }
            
            Console.ReadLine();
       }        
    }
}

using System;

using System.Net;

using Newtonsoft.Json;

namespace currencyexample

{

class Program

{

static void Main(string[] args)

{

double amount, curAmount;

int exchangeType;

string url = "http://www.floatrates.com/daily/usd.json";

string json = new WebClient().DownloadString(url);

var currency = JsonConvert.DeserializeObject<dynamic>(json);

Console.Write("Enter Your Amount:");

amount = Convert.ToSingle(Console.ReadLine());

Console.Write("\nPress(1) for Dollar->Euro \nPress(2) for Euro->Dollar \nEnter exchange type: ");

exchangeType = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("*************************");

if(exchangeType==1)

{

curAmount = amount * Convert.ToSingle(currency.eur.rate);

Console.WriteLine("{0:N2}{1}", curAmount,currency.eur.code);

}

else if(exchangeType == 2)

{

curAmount = amount * Convert.ToSingle(currency.eur.inverseRate);

Console.WriteLine("{0:N2}{1}", curAmount, "USD");

}

Console.ReadLine();

}

Sample Application 1: The same example created with another JSON API

For Dollar to Euro : http://api.openrates.io/latest?base=USD

For Euro to Dollar : http://api.openrates.io/latest?base=EUR


using System;
using System.Net;
using Newtonsoft.Json;


namespace currencyexample
{
    class Program
    {
       static void Main(string[] args)
       {
            double amount, curAmount;
            string url = "http://api.openrates.io/latest?base=USD";
            string json = new WebClient().DownloadString(url);
            var currency = JsonConvert.DeserializeObject<dynamic>(json);
            

            Console.Write("Enter Your Amount:");
            amount = Convert.ToSingle(Console.ReadLine());
            Console.WriteLine("*************************");

            curAmount = amount * Convert.ToSingle(currency.rates.EUR);
            Console.WriteLine("{0:N2} {1} = {2:N2} {3}",amount, currency["base"],curAmount,"EUR");

            
            Console.ReadLine();
       }        
    }
}

using System;

using System.Net;

using Newtonsoft.Json;

namespace currencyexample

{

class Program

{

static void Main(string[] args)

{

double amount, curAmount;

string url = "http://api.openrates.io/latest?base=USD";

string json = new WebClient().DownloadString(url);

var currency = JsonConvert.DeserializeObject<dynamic>(json);

Console.Write("Enter Your Amount:");

amount = Convert.ToSingle(Console.ReadLine());

Console.WriteLine("*************************");

curAmount = amount * Convert.ToSingle(currency.rates.EUR);

Console.WriteLine("{0:N2} {1} = {2:N2} {3}",amount, currency["base"],curAmount,"EUR");

Console.ReadLine();

}

Dollar / Euro Currency Exchange Rate Convertor in C# using JSON

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