C#读写Json

　　C#处理json文件主要有两种方式：

　　（1）使用JavaScriptSerializer类，需要引入System.Web.Extension库，并添加下面两个引用：

　　using System.Web;
　　using System.Web.Script.Serialization;

　　主要代码如下所示：

    public class Data
    {
        public int Id { get; set; }
        // [ScriptIgnore]
        public string Name { get; set; }

        public string GetName()
        {
            return Id.ToString() + Name;
        }
    }

    public class JsonPaserWeb
    {
        // Object->Json
        public string Serialize(Data obj)
        {
            JavaScriptSerializer jsonSerializer = new JavaScriptSerializer();
            string json = jsonSerializer.Serialize(obj);
            return json;
        }

        // Json->Object
        public Data Deserialize(string json)
        {
            JavaScriptSerializer jsonSerializer = new JavaScriptSerializer();
            //执行反序列化
            Data obj = jsonSerializer.Deserialize<Data>(json);
            return obj;
        }
    }

　　可以使用[ScriptIgnore]标记来让某个变量不参与序列化。

　　（2）使用DataContractJsonSerializer类，需要引入System.Runtime.Serialization库，并加入如下引用：

　　using System.Runtime.Serialization;
　　using System.Runtime.Serialization.Json;

　　示例代码如下所示：

　　[DataContract]
    public class Data
    {
        [DataMember(Name = "id", Order = 0)]
        public int Id;

        [DataMember(Name = "name", Order = 1)]
        public string Name;

        [DataMember(Name = "child", Order = 2)]
        public Child child = new Child();

        [DataMember(Name = "list", Order = 3)]
        public List<int> Ids = new List<int>();

        [DataMember(Name = "dictionary", Order = 4)]
        public Dictionary<int, Child> dic = new Dictionary<int, Child>();

        [IgnoreDataMember]
        public string Description = "This is a json data class";

    }

    public class Child
    {
        public float Age;
        public string FullName;
    }

    class JsonParserRuntime
    {
        // Object->Json
        public string Serialize(Data obj)
        {
            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());
            string json = "";
            using (MemoryStream stream = new MemoryStream())
            {
                jsonSerializer.WriteObject(stream, obj);
                json = Encoding.UTF8.GetString(stream.ToArray());
            }
            return json;
        }

        // Json->Object
        public Data Deserialize(string json)
        {
            Data obj = null;
            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
            {
                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(Data));
                obj = (Data)jsonSerializer.ReadObject(ms);
            }
            return obj;
        }
    }

　　使用[DataContract]标记的类，可以同时使用[DataMember(Name = "id", Order = 0)]标记来处理变量，也可以使用[IgnoreDataMember]标记来让某个变量不参与序列化。