using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        Test(JObject.Parse("{\"body\":\"eyJ0ZXN0IjoiYm9keSJ9\",\"resource\":\"/{proxy+}\",\"path\":\"/path/to/resource\",\"httpMethod\":\"GET\",\"isBase64Encoded\":true,\"queryStringParameters\":{\"foo\":\"bar\"},\"multiValueQueryStringParameters\":{\"foo\":[\"bar\"]},\"pathParameters\":{\"proxy\":\"/path/to/resource\"},\"stageVariables\":{\"baz\":\"qux\"}}")); // empty object

        //Test(JObject.Parse("[]")); // empty array

        //Test(JObject.Parse("\"\"")); // empty string

        //Test(JObject.Parse("null")); // null value

    }

    private static void Test(JObject request)

    {

        string unit_id = null;

        if (request != null) {

            Console.WriteLine("Log: request: " + request.ToString());

        }

        if (request["pathParameters"]["proxy"] != null)

        {

            unit_id = request["pathParameters"]["proxy"].ToString();

            Console.WriteLine("Log: Get request.PathParameters - unit_id: " + unit_id.ToString());

        }

    }

}

​

public static class JsonHelper

{

    public static bool IsNullOrEmpty(this JToken token)

    {

        return (token == null) ||

               (token.Type == JTokenType.Array && !token.HasValues) ||

               (token.Type == JTokenType.Object && !token.HasValues) ||

               (token.Type == JTokenType.String && token.ToString() == String.Empty) ||

               (token.Type == JTokenType.Null);

    }

​

    public static bool IsNullOrEmpty2(this JToken token)

    {

        return token == null || string.IsNullOrWhiteSpace(token.ToString());

    }

}