using System;

using Microsoft.Azure.Documents;

using Microsoft.Azure.Documents.Client;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var partitionKeyValue = "39393939"; // Some partition key in Cosmos DB collection

        var requestOptions = new RequestOptions

        {

            PartitionKey = new PartitionKey(partitionKeyValue)

        };

​

        var data = JsonConvert.SerializeObject(requestOptions, Formatting.Indented, new PartitionKeyConverter());

        Console.WriteLine(data);

        Console.WriteLine();

​

        // send data to Azure Functions

        var requestOptions1 = JsonConvert.DeserializeObject<RequestOptions>(data, new PartitionKeyConverter());

        Console.WriteLine(requestOptions1.PartitionKey);

    }

}

​

public class PartitionKeyConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType == typeof(PartitionKey);

    }

​

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        string s = (string)reader.Value;

        return s != null ? PartitionKey.FromJsonString(s) : null;

    }

​

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        writer.WriteValue(value.ToString());

    }

}

​