YahooFinanceApi

Install the YahooFinanceApi package using the NuGet Package Manager Console.

Note for .NET Framework users: If you encounter a System.Runtime.Serialization.Primitives missing exception, you must install that package manually, as NuGet may not automatically resolve this reference for traditional .NET Framework projects.

PM> Install-Package YahooFinanceApi

Yahoo sometimes returns broken or empty rows in historical data calls. You can control whether these rows are ignored by setting the Yahoo.IgnoreEmptyRows property.

// Set to true to ignore invalid/empty rows returned by Yahoo
Yahoo.IgnoreEmptyRows = true;

Because Yahoo terminated their CSV quote service, the GetAsync method is obsolete. Use QueryAsync instead. You can query multiple symbols simultaneously and specify which Fields you want to retrieve using a fluent interface.

To access values, you can use the indexer with a Field or use the typed property directly on the returned object.

using YahooFinanceApi;

// Query multiple symbols with specific fields
var securities = await Yahoo.Symbols("AAPL", "GOOG")
    .Fields(Field.Symbol, Field.RegularMarketPrice, Field.FiftyTwoWeekHigh)
    .QueryAsync();

var aapl = securities["AAPL"];

// Access data via indexer or typed property
var price = aapl[Field.RegularMarketPrice]; 
// OR
var priceTyped = aapl.RegularMarketPrice;

Retrieve historical price data (Open, High, Low, Close, Volume, etc.) for a stock. The startTime and endTime parameters default to the EST timezone. You can specify the granularity using the Period enum (e.g., Period.Daily).

var history = await Yahoo.GetHistoricalAsync("AAPL", new DateTime(2016, 1, 1), new DateTime(2016, 7, 1), Period.Daily);

foreach (var candle in history)
{
    Console.WriteLine($"DateTime: {candle.DateTime}, Open: {candle.Open}, High: {candle.High}, Low: {candle.Low}, Close: {candle.Close}, Volume: {candle.Volume}, AdjustedClose: {candle.AdjustedClose}");
}

Retrieve the dividend history for a specific stock symbol within a given date range.

var dividends = await Yahoo.GetDividendsAsync("AAPL", new DateTime(2016, 1, 1), new DateTime(2016, 7, 1));
foreach (var candle in dividends)
{
    Console.WriteLine($"DateTime: {candle.DateTime}, Dividend: {candle.Dividend}");
}

Retrieve the history of stock splits for a specific symbol within a given date range.

var splits = await Yahoo.GetSplitsAsync("AAPL", new DateTime(2014, 6, 8), new DateTime(2014, 6, 10));
foreach (var s in splits)
{
    Console.WriteLine($"DateTime: {s.DateTime}, AfterSplit: {s.AfterSplit}, BeforeSplit: {s.BeforeSplit}");
}