Yahoo Weather API C# Example

weather_ydn_sample.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

class Program
{
    static void Main(string[] args)
    {
        const string appId = "8eqyZg6s";
        const string consumerKey = "dj0yJmk9dkw3YWVLTEdXUmNRJnM9Y29uc3VtZXJzZWNyZXQmc3Y9MCZ4PTM3";
        const string consumerSecret = "fd427dd3ec3da0046fbd78ac1444f1a660259c6d";
        const string url = "https://weather-ydn-yql.media.yahoo.com/forecastrss";

        long timeStamp = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds;
        byte[] nonce = new byte[32];
        Random rand = new Random();
        rand.NextBytes(nonce);
        string oauthNonce = new string(Convert.ToBase64String(nonce).ToArray());
        oauthNonce = Regex.Replace(oauthNonce, @"[^0-9a-zA-Z]+", "");

        List<string> parameters = new List<string>
        {
            "oauth_consumer_key=" + consumerKey,
            "oauth_nonce=" + oauthNonce,
            "oauth_signature_method=HMAC-SHA1",
            "oauth_timestamp=" + timeStamp,
            "oauth_version=1.0",
            // Make sure value is encoded
            "location=" + HttpUtility.UrlEncode("sunnyvale,ca", Encoding.UTF8),
            "format=json"
        };
        parameters.Sort();

        StringBuilder parametersList = new StringBuilder();
        for (int i = 0; i < parameters.Count; i++)
        {
            parametersList.Append(((i > 0) ? "&" : "") + parameters[i]);
        }

        string signatureString = "GET&" +
            HttpUtility.UrlEncode(url, Encoding.UTF8) + "&" +
            HttpUtility.UrlEncode(parametersList.ToString(), Encoding.UTF8);

        string signature = null;
        try
        {
            byte[] signingKey = Encoding.UTF8.GetBytes(consumerSecret);
            HMACSHA1 hmac = new HMACSHA1(signingKey);
            byte[] rawHmac = hmac.ComputeHash(Encoding.UTF8.GetBytes(signatureString));
            signature = HttpUtility.UrlEncode(Convert.ToBase64String(rawHmac), Encoding.UTF8);
        }
        catch (Exception)
        {
            System.Diagnostics.Debug.WriteLine("Unable to append signature");
            Environment.Exit(0);
        }

        string authorizationLine = "OAuth " +
            "oauth_consumer_key=\"" + consumerKey + "\", " +
            "oauth_nonce=\"" + oauthNonce + "\", " +
            "oauth_timestamp=\"" + timeStamp + "\", " +
            "oauth_signature_method=\"HMAC-SHA1\", " +
            "oauth_signature=\"" + signature + "\", " +
            "oauth_version=\"1.0\"";

        var request = (HttpWebRequest)WebRequest.Create(url + "?location=sunnyvale,ca&format=json");
        request.Headers.Add("Authorization", authorizationLine);
        request.Headers.Add("Yahoo-App-Id", appId);
        request.ContentType = "application/json";

        Console.WriteLine(request);
        Console.ReadLine();

        var response = (HttpWebResponse)request.GetResponse();
        var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        Console.WriteLine(responseString);
    }
}

Here is the complete example of Yahoo weather by location Name.

Yahoo Weather Example Link