JSON 轉成 C# 動態類

任意 JSON 轉成 C# 動態類,無需事先聲明一個C#類型，實現json字符串轉成dynamic 類

示例:

class Program
    {
        static void Main(string[] args)
        {
            string json = "{name:'hooyes',pwd:'hooyespwd',books:{a:'紅樓夢',b:'水滸傳',c:{arr:['寶玉','林黛玉']}},arr:['good','very good']}";

            dynamic dy = ConvertJson(json);

            Console.WriteLine(dy.name);

            Console.WriteLine(dy.books.a);

            Console.WriteLine(dy.arr[1]);

            foreach (var s in dy.books.c.arr)
            {
                Console.WriteLine(s);
            }

            Console.Read();

        }
        static dynamic ConvertJson(string json)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            jss.RegisterConverters(new JavaScriptConverter[] { new DynamicJsonConverter() });
            dynamic dy = jss.Deserialize(json, typeof(object)) as dynamic;
            return dy;
        }
    }

用到兩個自定義的類:DynamicJsonConverter,DynamicJsonObject

public class DynamicJsonConverter : JavaScriptConverter
    {
        public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
        {
            if (dictionary == null)
                throw new ArgumentNullException("dictionary");

            if (type == typeof(object))
            {
                return new DynamicJsonObject(dictionary);
            }

            return null;
        }

        public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
        {
            throw new NotImplementedException();
        }

        public override IEnumerable<Type> SupportedTypes
        {
            get { return new ReadOnlyCollection<Type>(new List<Type>(new Type[] { typeof(object) })); }
        }
    }

public class DynamicJsonObject : DynamicObject
    {
        private IDictionary<string, object> Dictionary { get; set; }

        public DynamicJsonObject(IDictionary<string, object> dictionary)
        {
            this.Dictionary = dictionary;
        }

        public override bool TryGetMember(GetMemberBinder binder, out object result)
        {
            result = this.Dictionary[binder.Name];

            if (result is IDictionary<string, object>)
            {
                result = new DynamicJsonObject(result as IDictionary<string, object>);
            }
            else if (result is ArrayList && (result as ArrayList) is IDictionary<string, object>)
            {
                result = new List<DynamicJsonObject>((result as ArrayList).ToArray().Select(x => new DynamicJsonObject(x as IDictionary<string, object>)));
            }
            else if (result is ArrayList)
            {
                result = new List<object>((result as ArrayList).ToArray());
            }

            return this.Dictionary.ContainsKey(binder.Name);
        }
    }