json解析（可以解决奇怪的json串）

需要先引用 Newtonsoft.Json.dll

public void Test_json()
        {
            string a = "{\"input\":{\"size\":193156,\"type\":\"image/png\"},\"output\":{\"size\":59646,\"type\":\"image/png\",\"width\":487,\"height\":284,\"ratio\":0.3088,\"url\":\"https://api.tinify.com/output/hrqtghqtv0ab4qgv.png\"}}";
            //Console.WriteLine(a);
            Newtonsoft.Json.Linq.JObject jobject =
                (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(a);
            string input_size = Convert.ToString(jobject["output"]);
            Console.WriteLine(input_size);
        }