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Json.NET

Custom JsonConverter<T>

 

This sample creates a custom JsonConverterT that overrides serialization to add a keys property.

Sample
Types
public class VersionConverter : JsonConverter<Version>
{
    public override void WriteJson(JsonWriter writer, Version value, JsonSerializer serializer)
    {
        writer.WriteValue(value.ToString());
    }

    public override Version ReadJson(JsonReader reader, Type objectType, Version existingValue, bool hasExistingValue, JsonSerializer serializer)
    {
        string s = (string)reader.Value;

        return new Version(s);
    }
}

public class NuGetPackage
{
    public string PackageId { get; set; }
    public Version Version { get; set; }
}
Usage
NuGetPackage p1 = new NuGetPackage
{
    PackageId = "Newtonsoft.Json",
    Version = new Version(10, 0, 4)
};

string json = JsonConvert.SerializeObject(p1, Formatting.Indented, new VersionConverter());

Console.WriteLine(json);
// {
//   "PackageId": "Newtonsoft.Json",
//   "Version": "10.0.4"
// }

NuGetPackage p2 = JsonConvert.DeserializeObject<NuGetPackage>(json, new VersionConverter());

Console.WriteLine(p2.Version.ToString());
// James