Json.net

浏览数：55 / 时间：2015年06月09日

Json.net 效率

Json.net 的特性

1.net 集合

1.1 无序集合 Dictionary，Hashtable


Hashtable ht = new Hashtable();
ht.Add("string", "Hashtable");
ht.Add("DateTime", System.DateTime.Now);
ht.Add("int", 10);
textBox2.Text = JsonConvert.SerializeObject(ht, Newtonsoft.Json.Formatting.Indented);

Dictionary<object, object> dict = new Dictionary<object, object>();
dict.Add("string", "Dictionary");
dict.Add("DateTime", System.DateTime.Now);
dict.Add("int", 10);
textBox2.Text += "\r\n" + JsonConvert.SerializeObject(dict, Newtonsoft.Json.Formatting.Indented);

看下效果:
$7T5W9P1WKX(H{@C{_O`V`(K$

1.2 有序集合 DataTable,List,Array


DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("string",typeof(string)));
dt.Columns.Add(new DataColumn("DateTime", typeof(DateTime)));
dt.Columns.Add(new DataColumn("int", typeof(int)));
DataRow dr = dt.NewRow();
dr[0] = "test1";
dr[1] = System.DateTime.Now;
dr[2] = 10;
dt.Rows.Add(dr);
DataRow dr1 = dt.NewRow();
dr1[0] = "test2";
dr1[1] = System.DateTime.Now;
dr1[2] = 10;
dt.Rows.Add(dr1);
textBox2.Text = JsonConvert.SerializeObject(dt, Newtonsoft.Json.Formatting.Indented);

看下效果:

2 JObject 对象
2.1 不用实体序列化Json 对象

             JObject obj = new JObject()
                {
                    {"UserName","wwwwww"},
                    {"Vipgrade",30},
                    {
                        "TravelMoney",new JArray
                         {
                             "任我游",
                             "任我住",
                             "任我行",
                         }
                    }
                };
                textBox2.Text = JsonConvert
                    .SerializeObject(obj, Newtonsoft.Json.Formatting.Indented);
                JObject obj1 = new JObject();
                obj1.Add("userName", JToken.FromObject("wwwwww"));
                obj1.Add("Vipgarde", JToken.FromObject(30));
                obj1.Add("TravelMoney", JToken.FromObject(
                        new List<KeyAndValue>(){
                            new KeyAndValue(){
                                Key="50",
                                Value = "任我游"
                            },
                            new KeyAndValue()
                            {
                                Key="100",
                                Value = "任我行"
                            }
                        }
                    ));
                textBox2.Text += "\r\n" + JsonConvert


public class KeyAndValue
{
    [JsonProperty(PropertyName = "金额")]
    public string Key
    {
        get;
        set;
    }

    [JsonProperty(PropertyName = "名称")]
    public string Value
    {
        get;
        set;
    }

    public override string ToString()
    {
        return "(" + this.Key.ToString() + ")" + this.Value.ToString();
    }
}

看下效果:

2.2 Linq To Json 支持

string s = @"{
        List: [
            {
                ‘Hotelid‘: 1,
                ‘HotelName‘: ‘保安‘,
                ‘En_HotelName‘: ‘baoan‘
            },
            {
                ‘Hotelid‘: 2,
                ‘HotelName‘: ‘华庭宾馆‘,
                ‘En_HotelName‘: ‘huating‘
            }
        ]
    }";
textBox1.Text = s;

JObject obj = JObject.Parse(textBox1.Text);
var TempInfo = from n in obj.Property("List").ToList()[0]
               select new
               {
                   hotelid = n.SelectToken("Hotelid"),
                   HotelName = n.SelectToken("HotelName")
               };
foreach (var a in TempInfo)
{
    MessageBox.Show(((JValue)a.hotelid).Value.ToString() + a.HotelName);
}
textBox2.Text = JsonConvert.SerializeObject(TempInfo, Newtonsoft.Json.Formatting.Indented);

看下效果:

3 Json 动态效果
可以根据你的Value 值来进行Key值得显示。

//会员等级
   public enum VipGrade
   {
       Gold = 20,

       Silver = 10,

       diamond = 30
   }


   public class Cusomter
   {
       public Cusomter(int _ID, string _UserName, VipGrade _vipGrade,int _integral)
       {
           ID = _ID; 
           UserName = _UserName; 
           vipGrade = _vipGrade;
           integral = _integral;
       }

       /// <summary>
       /// ID
       /// </summary>
       public int ID
       {
           get;
           set;
       }

       /// <summary>
       /// 客户名称
       /// </summary>
       public string UserName
       {
           get;
           set;
       }

       /// <summary>
       /// 会员等级
       /// </summary>
       [JsonConverter(typeof(StringEnumConverter))]
       public VipGrade vipGrade
       {
           get;
           set;
       }

       /// <summary>
       /// 积分
       /// </summary>
       public int integral
       {
           get;
           set;
       }
   }


public class HideintegralContractResolver : DefaultContractResolver
{
    private readonly int integral;
    private readonly VipGrade vipgrade;
    public HideintegralContractResolver(VipGrade _vipgrade,int _integral)
    {
        integral = _integral;
        vipgrade = _vipgrade;
    }
    protected override IList<JsonProperty> CreateProperties(Type type,MemberSerialization memberSerialization)
    {
        IList<JsonProperty> list = base.CreateProperties(type, memberSerialization);
         list[3].ShouldSerialize = x =>
         {
             Cusomter e = (Cusomter)x;
             if (e.integral > integral && e.vipGrade.GetHashCode() >= vipgrade.GetHashCode())
             {
                 return e.integral == e.integral;
             }
             else
             {
                 return e.integral != e.integral;
             }
         };
        return list;
    }
}


List<Cusomter> list = new List<Cusomter>();
list.Add(new Cusomter(1, "张三", VipGrade.diamond, 20000));
list.Add(new Cusomter(2, "李四", VipGrade.Gold, 3000));
list.Add(new Cusomter(3, "王五", VipGrade.Silver, 4000));

textBox1.Text = JsonConvert.SerializeObject(list, Newtonsoft.Json.Formatting.Indented);

var settings = new JsonSerializerSettings();
//积分担保 > 金牌用户且积分>10000的用户,序列化显示积分
settings.ContractResolver = new HideintegralContractResolver(VipGrade.Gold, 10000);
textBox2.Text = JsonConvert.SerializeObject(list, Newtonsoft.Json.Formatting.Indented, settings);

看下效果:

4.异常处理
我们给Key:int_object(Int) 类型赋个String类型，一样可以序列化成功

public class JsonNetTest
    {
        public string str_object
        {
            get;
            set;
        }

        public DateTime dt_object
        {
            get;
            set;
        }

 
        public int int_object
        {
            get;
            set;
        }

        public float flt_object
        {
            get;
            set;
        }

        [OnDeserializing]
        internal void OnDeserializingMethod(StreamingContext context)
        {        
        }

        [OnDeserialized]
        internal void OnDeserializedMethod(StreamingContext context)
        {
        }

        [OnError]
        internal void OnError(StreamingContext context, ErrorContext errorContext)
        {
            if (errorContext.Member.ToString().Equals("int_object"))
            {
                errorContext.Handled = true;
            }
            else
            {
                errorContext.Handled = false;
            }
        }
    }


JObject obj = new JObject()
{
    {"str_object","www\‘www"},
    {"dt_object",DateTime.Now},
    {"int_object","fsdafs"},
    {"flt_object",10},
};

textBox1.Text = JsonConvert.SerializeObject(obj, Newtonsoft.Json.Formatting.Indented);
JsonNetTest test = (JsonNetTest)JsonConvert.DeserializeObject<JsonNetTest>(obj.ToString());
textBox2.Text = JsonConvert.SerializeObject(test, Newtonsoft.Json.Formatting.Indented);