EMA

What EMA does?

This API returns the exponential moving average (EMA) values. The related REST API documentation is here

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Including the EMA namespace

The very first thing to do before diving into EMA calls is to include the right namespace.

using Avapi.AvapiEMA

How to get a EMA object?

The EMA object is retrieved from the Connection object.

The snippet below shows how to get the Connection object:

...
IAvapiConnection connection = AvapiConnection.Instance
connection.Connect("Your Alpha Vantage API Key !!!!");
...

Once you got the Connection object you can extract the EMA from it.

...
Int_EMA ema = 
	connection.GetQueryObject_EMA();

Perform a EMA Synchronous Request

To perform a EMA request you have 2 options:

1. The request with constants:

IAvapiResponse_EMA Query(string symbol,
		EMA_interval interval,
		int time_period,
		EMA_series_type series_type);

2. The request without constants:

IAvapiResponse_EMA QueryPrimitive(string symbol,
		string interval,
		string time_period,
		string series_type);

Perform an EMA Asynchronous Request

To perform an EMA asynchronous request you have 2 options:

1. The request with constants:

async Task<IAvapiResponse_EMA> QueryAsync(string symbol,
		EMA_interval interval,
		int time_period,
		EMA_series_type series_type);

2. The request without constants:

async Task<IAvapiResponse_EMA> QueryAsync(string symbol,
		string interval,
		string time_period,
		string series_type);

Parameters

The parameters below are needed to perform the EMA request.

• symbol: The name of the equity
• interval: The time interval between two consecutive data points in the time series.
• time_period: Number of data points used to calculate each moving average value.
• series_type: The price type in the time series. The types supported are: close, open, high, low

Please notice that the info above are copied from the official alphavantage documentation, that you can find here.

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The request with constants

The request with constants implies the use of different enums:

• EMA_interval
• EMA_series_type

EMA_interval: The time interval between two consecutive data points in the time series.

public enum EMA_interval
{
	none,
	n_1min,
	n_5min,
	n_15min,
	n_30min,
	n_60min,
	daily,
	weekly,
	monthly
}

EMA_series_type: The price type in the time series. The types supported are: close, open, high, low

public enum EMA_series_type
{
	none,
	close,
	open,
	high,
	low
}

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EMA Response

The response of a EMA request is an object that implements the IAvapiResponse_EMA interface.

public interface IAvapiResponse_EMA
{
    string RawData
    {
        get;
    }
    IAvapiResponse_EMA_Content Data
    {
        get;
    }
}

The IAvapiResponse_EMA interface has two members: RawData and Data.

• RawData: represents the json response in string format.
• Data: It represents the parsed response in an object implementing the interface IAvapiResponse_EMA_Content.

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Complete Example of a Console App: Display the result of a EMA request by using the method Query (synchronous request)

using System;
using System.IO;
using Avapi.AvapiEMA;

namespace Avapi
{
    public class Example
    {
        static void Main()
        {
            // Creating the connection object
            IAvapiConnection connection = AvapiConnection.Instance;

            // Set up the connection and pass the API_KEY provided by alphavantage.co
            connection.Connect("Your Alpha Vantage API Key !!!!");

            // Get the EMA query object
            Int_EMA ema =
                connection.GetQueryObject_EMA();

            // Perform the EMA request and get the result
            IAvapiResponse_EMA emaResponse = 
            ema.Query(
                 "MSFT",
                 Const_EMA.EMA_interval.n_1min,
                 10,
                 Const_EMA.EMA_series_type.close);

            // Printout the results
            Console.WriteLine("******** RAW DATA EMA ********");
            Console.WriteLine(emaResponse.RawData);

            Console.WriteLine("******** STRUCTURED DATA EMA ********");
            var data = emaResponse.Data;
            if (data.Error)
            {
                Console.WriteLine(data.ErrorMessage);
            }
            else
            {
                Console.WriteLine("Symbol: " + data.MetaData.Symbol);
                Console.WriteLine("Indicator: " + data.MetaData.Indicator);
                Console.WriteLine("LastRefreshed: " + data.MetaData.LastRefreshed);
                Console.WriteLine("Interval: " + data.MetaData.Interval);
                Console.WriteLine("TimePeriod: " + data.MetaData.TimePeriod);
                Console.WriteLine("SeriesType: " + data.MetaData.SeriesType);
                Console.WriteLine("TimeZone: " + data.MetaData.TimeZone);
                Console.WriteLine("========================");
                Console.WriteLine("========================");
                foreach (var technical in data.TechnicalIndicator)
                {
                    Console.WriteLine("EMA: " + technical.EMA);
                    Console.WriteLine("DateTime: " + technical.DateTime);
                    Console.WriteLine("========================");
                }
            }
        }
    }
}

Complete Example of a Windows Form App: Display the result of a EMA request by using the method QueryAsync (asynchronous request)

using Avapi;
using Avapi.AvapiEMA
using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        private IAvapiConnection m_connection = AvapiConnection.Instance;
        private Int_EMA m_ema;
        private IAvapiResponse_EMA m_emaResponse;

        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
        {
            // Set up the connection and pass the API_KEY provided by alphavantage.co
            m_connection.Connect("Your Alpha Vantage Key");

            // Get the EMA query object
            m_ema = m_connection.GetQueryObject_EMA();

            base.OnLoad(e);
        }

        private async void EMAAsyncButton_Click(object sender, EventArgs e)
        {
            // Perform the EMA request and get the result
            m_emaResponse = 
                await m_ema.QueryAsync(
                     "MSFT",
                     Const_EMA.EMA_interval.n_1min,
                     10,
                     Const_EMA.EMA_series_type.close);

             // Show the results
            resultTextBox.AppendText("******** RAW DATA EMA ********" + "\n");
            resultTextBox.AppendText(m_emaResponse.RawData + "\n");

            resultTextBox.AppendText("******** STRUCTURED DATA EMA ********" + "\n");
            var data = m_emaResponse.Data;
            if (data.Error)
            {
                resultTextBox.AppendText(data.ErrorMessage + "\n");
            }
            else
            {
                resultTextBox.AppendText("Symbol: " + data.MetaData.Symbol + "\n");
                resultTextBox.AppendText("Indicator: " + data.MetaData.Indicator + "\n");
                resultTextBox.AppendText("LastRefreshed: " + data.MetaData.LastRefreshed + "\n");
                resultTextBox.AppendText("Interval: " + data.MetaData.Interval + "\n");
                resultTextBox.AppendText("TimePeriod: " + data.MetaData.TimePeriod + "\n");
                resultTextBox.AppendText("SeriesType: " + data.MetaData.SeriesType + "\n");
                resultTextBox.AppendText("TimeZone: " + data.MetaData.TimeZone + "\n");
                resultTextBox.AppendText("========================" + "\n");
                resultTextBox.AppendText("========================" + "\n");
                foreach (var technical in data.TechnicalIndicator)
                {
                    resultTextBox.AppendText("EMA: " + technical.EMA + "\n");
                    resultTextBox.AppendText("DateTime: " + technical.DateTime + "\n");
                    resultTextBox.AppendText("========================" + "\n");
                }
            }
        }
    }
}