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C# C# Streams and Data Processing Serialization Serializing to a File

Posted by shawn khah
shawn khah
15,082 Points

can't solve challenge 1 of 4

Challenge Task 1 of 4

Create a new public static method named SerializeWeatherForecasts that returns void and takes a List<WeatherForecast> parameter named weatherForecasts and a string named fileName. Bummer! Does your DeserializeWeather method take a List<WeatherForecast> parameter named weatherForecasts? Restart Preview Get Help Recheck work Program.cs WeatherForecast.cs

1 using System; 2 using System.IO; 3 using System.Collections.Generic; 4 using Newtonsoft.Json; 5 ā€‹ 6 namespace Treehouse.CodeChallenges 7 { 8 public class Program 9 { 10 public static void Main(string[] arg) 11 { 12 } 13 public static void SerializeWeatherForecasts(List<WeatherForecast> serializeWeatherForecasts,string fileName) 14 { 15 } 16

17 public static WeatherForecast ParseWeatherForecast(string[] values) 18 { 19 var weatherForecast = new WeatherForecast(); 20 weatherForecast.WeatherStationId = values[0]; 21 DateTime timeOfDay; 22 if (DateTime.TryParse(values[1], out timeOfDay)) 23 { 24 weatherForecast.TimeOfDay = timeOfDay; 25 } 26 Condition condition; 27 if (Enum.TryParse(values[2], out condition)) 28 { 29 weatherForecast.Condition = condition; 30 } 31 int temperature; 32 if (int.TryParse(values[3], out temperature)) 33 { 34 weatherForecast.Temperature = temperature; 35 } 36 double precipitation; 37 if (double.TryParse(values[4], out precipitation)) 38 { 39 weatherForecast.PrecipitationChance = precipitation; 40 } 41 if (double.TryParse(values[5], out precipitation)) 42 { 43 weatherForecast.PrecipitationAmount = precipitation; 44 } 45 return weatherForecast; 46 } 47 ā€‹ 48 public static List<WeatherForecast> DeserializeWeather(string fileName) 49 { 50 var weatherForecasts = new List<WeatherForecast>(); 51

52 using (var reader = new StreamReader(fileName)) 53 using (var jsonReader = new JsonTextReader(reader)) 54 { 55 var serializer = new JsonSerializer(); 56 weatherForecasts = serializer.Deserialize<List<WeatherForecast>>(jsonReader); 57 } 58

59 return weatherForecasts; 60 } 61 } 62 }

Program.cs 
using System;
using System.IO;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace Treehouse.CodeChallenges
{
    public class Program
    {
        public static void Main(string[] arg)
        {
        }
         public static  void SerializeWeatherForecasts(List<WeatherForecast> serializeWeatherForecasts,string fileName)
        {
        }

       public static WeatherForecast ParseWeatherForecast(string[] values)
       {
            var weatherForecast = new WeatherForecast();
            weatherForecast.WeatherStationId = values[0];
            DateTime timeOfDay;
            if (DateTime.TryParse(values[1], out timeOfDay))
            {
                weatherForecast.TimeOfDay = timeOfDay;
            }
            Condition condition;
            if (Enum.TryParse(values[2], out condition))
            {
                weatherForecast.Condition = condition;
            }
            int temperature;
            if (int.TryParse(values[3], out temperature))
            {
                weatherForecast.Temperature = temperature;
            }
            double precipitation;
            if (double.TryParse(values[4], out precipitation))
            {
                weatherForecast.PrecipitationChance = precipitation;
            }
            if (double.TryParse(values[5], out precipitation))
            {
                weatherForecast.PrecipitationAmount = precipitation;
            }
            return weatherForecast;
        }

        public static List<WeatherForecast> DeserializeWeather(string fileName)
        {
            var weatherForecasts = new List<WeatherForecast>();

            using (var reader = new StreamReader(fileName))
            using (var jsonReader = new JsonTextReader(reader))
            {
                var serializer = new JsonSerializer();
                weatherForecasts = serializer.Deserialize<List<WeatherForecast>>(jsonReader);
            }

            return weatherForecasts;
        }
    }
}
WeatherForecast.cs 
using System;
using Newtonsoft.Json;

namespace Treehouse.CodeChallenges
{
    public class WeatherForecast
    {
        [JsonProperty(PropertyName = "weather_station_id")]
        public string WeatherStationId { get; set; }
        [JsonProperty(PropertyName = "time_of_day")]
        public DateTime TimeOfDay { get; set; }
        public Condition Condition { get; set; }
        public int Temperature { get; set; }
        [JsonProperty(PropertyName = "precipitation_chance")]
        public double PrecipitationChance { get; set; }
        [JsonProperty(PropertyName = "precipitation_amount")]
        public double PrecipitationAmount { get; set; }
    }

    public enum Condition
    {
        Rain,
        Cloudy,
        PartlyCloudy,
        PartlySunny,
        Sunny,
        Clear
    }
}

5 Answers

James Churchill
STAFF
James Churchill
Treehouse Teacher
James Churchill
James Churchill
Treehouse Teacher

Shawn,

The code challenge's error message is referring to the incorrect method name. The error message "Does your DeserializeWeather method take a List<WeatherForecast> parameter named weatherForecasts?" should read "Does your SerializeWeatherForecasts method take a List<WeatherForecast> parameter named weatherForecasts?".

I've updated the code challenge to fix this problem. Thanks so much for bringing this to our attention!

Thanks ~James

Jacob Archambault
Jacob Archambault
27,524 Points
Jacob Archambault
Jacob Archambault
27,524 Points

Here's how I got through the challenge set.

using System;
using System.IO;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace Treehouse.CodeChallenges
{
    public class Program
    {
        public static void Main(string[] arg)
        {
        }
        public static void SerializeWeatherForecasts(List<WeatherForecast> weatherForecasts, string fileName)
        {
            JsonSerializer serializer = new JsonSerializer();
            using (StreamWriter writer = new StreamWriter(fileName))
            using (JsonTextWriter jsonWriter = new JsonTextWriter(writer))
            {
                serializer.Serialize(jsonWriter, weatherForecasts);
            }
        }

       public static WeatherForecast ParseWeatherForecast(string[] values)
       {
            var weatherForecast = new WeatherForecast();
            weatherForecast.WeatherStationId = values[0];
            DateTime timeOfDay;
            if (DateTime.TryParse(values[1], out timeOfDay))
            {
                weatherForecast.TimeOfDay = timeOfDay;
            }
            Condition condition;
            if (Enum.TryParse(values[2], out condition))
            {
                weatherForecast.Condition = condition;
            }
            int temperature;
            if (int.TryParse(values[3], out temperature))
            {
                weatherForecast.Temperature = temperature;
            }
            double precipitation;
            if (double.TryParse(values[4], out precipitation))
            {
                weatherForecast.PrecipitationChance = precipitation;
            }
            if (double.TryParse(values[5], out precipitation))
            {
                weatherForecast.PrecipitationAmount = precipitation;
            }
            return weatherForecast;
        }

        public static List<WeatherForecast> DeserializeWeather(string fileName)
        {
            var weatherForecasts = new List<WeatherForecast>();

            using (var reader = new StreamReader(fileName))
            using (var jsonReader = new JsonTextReader(reader))
            {
                var serializer = new JsonSerializer();
                weatherForecasts = serializer.Deserialize<List<WeatherForecast>>(jsonReader);
            }

            return weatherForecasts;
        }
    }
}
D Elis
D Elis
13,571 Points
D Elis
D Elis
13,571 Points

working code: using System; using System.IO; using System.Collections.Generic; using Newtonsoft.Json;

namespace Treehouse.CodeChallenges { public class Program { public static void Main(string[] arg) { }

    public static WeatherForecast ParseWeatherForecast(string[] values)
    {
        var weatherForecast = new WeatherForecast();
        weatherForecast.WeatherStationId = values[0];
        DateTime timeOfDay;
        if (DateTime.TryParse(values[1], out timeOfDay))
        {
            weatherForecast.TimeOfDay = timeOfDay;
        }
        Condition condition;
        if (Enum.TryParse(values[2], out condition))
        {
            weatherForecast.Condition = condition;
        }
        int temperature;
        if (int.TryParse(values[3], out temperature))
        {
            weatherForecast.Temperature = temperature;
        }
        double precipitation;
        if (double.TryParse(values[4], out precipitation))
        {
            weatherForecast.PrecipitationChance = precipitation;
        }
        if (double.TryParse(values[5], out precipitation))
        {
            weatherForecast.PrecipitationAmount = precipitation;
        }
        return weatherForecast;
    }
        public static List<WeatherForecast> DeserializeWeather(string fileName)
    {
        var weatherForecasts = new List<WeatherForecast>();

        using (var reader = new StreamReader(fileName))
        using (var jsonReader = new JsonTextReader(reader))
        {
            var serializer = new JsonSerializer();
            weatherForecasts = serializer.Deserialize<List<WeatherForecast>>(jsonReader);
        }

        return weatherForecasts;

    }
}

}

Unsubscribed User
Unsubscribed User
16,118 Points
Unsubscribed User
Unsubscribed User
16,118 Points 
public static void SerializeWeatherForecasts(List<WeatherForecast> weatherForecasts, string fileName) {
            JsonSerializer serializer = new JsonSerializer();
            using (StreamWriter writer = new StreamWriter(fileName)){
            using (JsonTextWriter jsonWriter = new JsonTextWriter(writer)){
                    serializer.Serialize(jsonWriter, weatherForecasts);
                }
            }

        }