Question 109614 in Json Question posted in
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Convert String to Decimal in Dynimc json

I have a dynamic json string:

[{
  "Id": "1",
  "Description": "Scenario 1",
  "fc": "-45156,60000",
  "fci": "-45156,60000",
  "fcii": null,
  "fciii": null,
  "fciv": null,
},
{
  "Id": "1",
  "Description": "Scenario 2",
  "fc": "-45156,60000",
  "fci": "-45156,60000",
},
{
  "Id": "1",
  "Description": "Scenario 3",
  "fc": "-45156,60000",
  "fci": "-45156,60000",
  "fcii": null,
},
{
  "Id": "1",
  "Description": "Scenario 4",
  "fc": "-45156,60000",
}]

is it a good idea to search in json object for string that contains , an idea

    public decimal ConvertToDecimal(string s)         
    {             
        if (s.Contains(','))             
        {                 
            return decimal.Parse(s.Replace(',', '.'));             
        }             
        else                  
            return SomeDecimalValue;         
     }

How I can parse the string to Decimal and keep the decimal separator?

Tags:

2

Answers


  1. 0

    Change the decimal separator to ,, You can rewrite the convert method as follows:

    public decimal? ConvertToDecimal(string s)
{
    System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("en-US");
    culture.NumberFormat.NumberDecimalSeparator = ",";
    if (string.IsNullOrWhiteSpace(s))
        return null;
    return Decimal.Parse(s, culture);//#,#
}

    add reference to Json.NET

    APPROACH 1: The Easy way

    public class Converted
{
    public string Id { get; set; }
    public string Description { get; set; }
    public decimal? fc { get; set; }
    public decimal? fci { get; set; }
    public decimal? fcii { get; set; }
    public decimal? fciii { get; set; }
    public decimal? fciv { get; set; }
}

//from: https://json2csharp.com/
public class Root
{
    public string Id { get; set; }
    public string Description { get; set; }
    public string fc { get; set; }
    public string fci { get; set; }
    public string fcii { get; set; }
    public string fciii { get; set; }
    public string fciv { get; set; }

    //https://stackoverflow.com/questions/3013442/convert-string-to-decimal-retaining-the-exact-input-format
    public Converted Convert() {
        return new Converted()
        {
            Id = Id,
            Description = Description,
            fc = ConvertToDecimal(fc),
            fci = ConvertToDecimal(fci),
            fcii = ConvertToDecimal(fcii),
            fciii = ConvertToDecimal(fciii),
            fciv = ConvertToDecimal(fciv)
        };
    }

    public decimal? ConvertToDecimal(string s)
    {
        System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("en-US");
        culture.NumberFormat.NumberDecimalSeparator = ",";
        if (string.IsNullOrWhiteSpace(s))
            return null;
        return Decimal.Parse(s, culture);//#,#
    }
}

    usage:

    using Newtonsoft.Json;
using System.Globalization;

string json = File.ReadAllText("json1.json");
var obj = JsonConvert.DeserializeObject<List<Root>>(json);
List<Converted> ideal = new List<Converted>();
obj.ForEach(x =>
{
   ideal.Add(x.Convert());
});
Console.WriteLine(ideal.Count);

    APPROACH 2: The Ideal way

    Roll your own custom JsonConverter

    public class Converted
{
    public string Id { get; set; }
    public string Description { get; set; }

    [JsonConverter(typeof(NiceDecimalConverter))]
    public decimal? fc { get; set; }

    [JsonConverter(typeof(NiceDecimalConverter))]
    public decimal? fci { get; set; }

    [JsonConverter(typeof(NiceDecimalConverter))]
    public decimal? fcii { get; set; }

    [JsonConverter(typeof(NiceDecimalConverter))]
    public decimal? fciii { get; set; }

    [JsonConverter(typeof(NiceDecimalConverter))]
    public decimal? fciv { get; set; }
}

//from: https://stackoverflow.com/a/30083923/223752
public class NiceDecimalConverter : JsonConverter
{
    public decimal? ConvertToDecimal(object o)
    {
        string s = Convert.ToString(o);
        System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("en-US");
        culture.NumberFormat.NumberDecimalSeparator = ",";
        if (string.IsNullOrWhiteSpace(s))
            return null;
        return Decimal.Parse(s, culture);//#,#
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var d = (decimal?)value;
        if (!d.HasValue)
        {
            writer.WriteValue("null");
        }
        else
        {
            var niceLookingDecimal = d.ToString().Replace(".", ",");
            writer.WriteValue(niceLookingDecimal);
        }
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        return ConvertToDecimal(reader.Value);
    }

    public override bool CanRead
    {
        get { return true; }
    }

    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(decimal?);
    }
}

    usage:

    string json = File.ReadAllText("json1.json");
var obj = JsonConvert.DeserializeObject<List<Converted>>(json,new NiceDecimalConverter());
Console.WriteLine(obj.Count);
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  2. 0

    you can try this code

        var jArr = JArray.Parse(json);

    foreach (var item in jArr)
    {
        foreach (var prop in ((JObject)item).Properties())
        {
if (prop.Name=="Id" || prop.Name=="Description") continue; //you can remove it
            var val = ConvertToDecimal((string)prop.Value);
            if (val != null) prop.Value = val;
        }
    }

      json = jArr.ToString();

public decimal? ConvertToDecimal(string s)
{
    if (!string.IsNullOrEmpty(s))
        if (decimal.TryParse(s.Replace(',', '.'), out var val))
            return val;
    return null;
}

    Since nobody knows what value fc is – is it one number, or two you can change ConvertToDecimal accordingly.

    Or you can deserialize it using c# class

    List<Forecast> forecast= jArr.ToObject<List<Forecast>>();

public class Forecast
{
    public int Id { get; set; }
    public string Description { get; set; }

    [JsonExtensionData]
    public Dictionary<string, object> Extra { get; set; }
}
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