最近整理了一些C# JSON的处理方法,大致如下:
1--创建json对象
2--创建json数组
3--查询
4--修改
5--删除
6--添加
7--简化查询
8--删除列表里的a节点的值为aa的项
9--json其它用法
注意:使用该方法的时候需引用Newtonsoft.Json库文件,请在官网(http://www.newtonsoft.com/json)下载
以上是整理的一些常用JSON处理方法,后续将继续补充!
代码如下:
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading.Tasks;
- using System.IO; //StringReader
- using Newtonsoft.Json;
- using Newtonsoft.Json.Linq;
- using Newtonsoft.Json.Converters;//IsoDateTimeConverter
- namespace json1
- {
- class Program
- {
- static void Main(string[] args)
- {
- #region 创建json对象
- Console.WriteLine("\n\n1--创建json对象:");
- JObject staff = new JObject();
- staff.Add(new JProperty("Name", "Jack"));//等价于staff.Add("Name","Jack");
- staff.Add(new JProperty("Age", 33));
- staff.Add(new JProperty("Department", "Personnel Department"));
- staff.Add(new JProperty("Leader", new JObject(new JProperty("Name", "Tom"), new JProperty("Age", 44), new JProperty("Department", "Personnel Department"))));
- Console.WriteLine(staff.ToString());
- #endregion
- #region 创建json数组
- Console.WriteLine("\n\n2--创建json数组:");
- JArray arr = new JArray();
- arr.Add(new JValue(1));
- arr.Add(new JValue(2));
- arr.Add(new JValue(3));
- Console.WriteLine(arr.ToString());
- #endregion
- #region 查询
- Console.WriteLine("\n\n3--查询:");
- string json3 = "{\"Name\" : \"Jack\", \"Age\" : 34, \"Colleagues\" : [{\"Name\" : \"Tom\" , \"Age\":44},{\"Name\" : \"Abel\",\"Age\":29}] }";
- //将json转换为JObject
- JObject jObj = JObject.Parse(json3);
- #region 查询-获取某一员工的年龄
- Console.WriteLine("获取某一员工的年龄:");
- //通过属性名或者索引来访问,仅仅是自己的属性名,而不是所有的
- JToken ageToken = jObj["Age"];
- Console.WriteLine("age:" + ageToken.ToString());
- #endregion
- #region 查询-获取该员工所有同事的姓名
- Console.WriteLine("获取该员工所有同事的姓名:");
- var names = from staff1 in jObj["Colleagues"].Children()
- select (string)staff1["Name"];
- //"Children()"可以返回所有数组中的对象
- foreach (var name in names)
- Console.WriteLine(name);
- #endregion
- #endregion
- #region 修改
- Console.WriteLine("\n\n4--修改:");
- string json4 = "{\"Name\" : \"Jack\", \"Age\" : 34, \"Colleagues\" : [{\"Name\" : \"Tom\" , \"Age\":44},{\"Name\" : \"Abel\",\"Age\":29}] }";
- //将json转换为JObject
- JObject jObj4 = JObject.Parse(json4);
- #region 修改--将jack年龄修改为35
- Console.WriteLine("修改--将jack年龄修改为35");
- jObj4["Age"] = 35;
- //JToken age =
- Console.WriteLine(jObj4.ToString());
- #endregion
- #region 修改--将jack同事tom年龄修改Wie45
- Console.WriteLine("\n修改--将jack同事tom年龄修改为45");
- JToken colleagues = jObj4["Colleagues"];//JToken 不用实例化
- colleagues[0]["Age"] = 45;
- jObj4["Colleagues"] = colleagues;//将修改后的赋值给json对象
- Console.WriteLine(jObj4.ToString());
- #endregion
- #endregion
- #region 删除
- Console.WriteLine("\n\n5--删除:");
- string json5 = "{\"Name\" : \"Jack\", \"Age\" : 34, \"Colleagues\" : [{\"Name\" : \"Tom\" , \"Age\":44},{\"Name\" : \"Abel\",\"Age\":29},{\"Name\" : \"Jully\",\"Age\":23}] }";
- //将json转换为JObject
- JObject jObj5 = JObject.Parse(json5);
- #region 删除--删除同事Tom
- Console.WriteLine("删除--删除同事Tom");
- jObj5["Colleagues"][0].Remove();
- Console.WriteLine(jObj5.ToString());
- #endregion
- #region 删除--删除所有同事
- Console.WriteLine("\n删除--删除所有同事");
- jObj5.Remove("Colleagues");//跟的是属性名称
- Console.WriteLine(jObj5.ToString());
- #endregion
- #endregion
- #region 添加
- Console.WriteLine("\n\n6--添加:");
- string json6 = "{\"Name\" : \"Jack\", \"Age\" : 34, \"Colleagues\" : [{\"Name\" : \"Tom\" , \"Age\":44},{\"Name\" : \"Abel\",\"Age\":29},{\"Name\" : \"Jully\",\"Age\":23}] }";
- //将json转换为JObject
- JObject jObj6 = JObject.Parse(json6);
- #region 发现Jack的信息中少了部门信息,要求我们必须添加在Age的后面
- Console.WriteLine("发现Jack的信息中少了部门信息,要求我们必须添加在Age的后面");
- jObj6["Age"].Parent.AddAfterSelf(new JProperty("Department", "Personnel Department"));
- Console.WriteLine(jObj6.ToString());
- #endregion
- #region 添加一个新同事
- Console.WriteLine("\n添加一个新同事");
- JObject linda = new JObject(new JProperty("Name", "Linda"), new JProperty("Age", "23"));
- jObj6["Colleagues"].Last.AddAfterSelf(linda);
- Console.WriteLine(jObj6.ToString());
- #endregion
- #endregion
- #region 简化查询
- Console.WriteLine("\n\n7--简化查询:");
- string json7 = "{\"Name\" : \"Jack\", \"Age\" : 34, \"Colleagues\" : [{\"Name\" : \"Tom\" , \"Age\":44},{\"Name\" : \"Abel\",\"Age\":29},{\"Name\" : \"Jully\",\"Age\":23}] }";
- //将json转换为JObject
- JObject jObj7 = JObject.Parse(json7);
- #region 利用SelectToken来查询名称
- Console.WriteLine("简化查询--利用SelectToken来查询名称");
- JToken name7 = jObj7.SelectToken("Name");
- Console.WriteLine(name7.ToString());
- #endregion
- #region 简化查询--利用SelectToken来查询所有同事的名字
- Console.WriteLine("\n简化查询--利用SelectToken来查询所有同事的名字");
- var names7 = jObj7.SelectToken("Colleagues").Select(p => p["Name"]).ToList();
- foreach (var theName in names7)
- Console.WriteLine(theName.ToString());
- #endregion
- #region 简化查询--查询最后一名同事的年龄
- Console.WriteLine("\n简化查询--查询最后一名同事的年龄");
- var age = jObj7.SelectToken("Colleagues[2].Age");
- Console.WriteLine(age.ToString());
- #endregion
- #endregion
- #region 删除列表里a节点的值为aa的项
- Console.WriteLine("\n\n8--删除列表里的a节点的值为aa的项:");
- string jsonText = "[{'a':'aaa','b':'bbb','c':'ccc'},{'a':'aa','b':'bb','c':'cc'}]";
- var mJObj8 = JArray.Parse(jsonText);
- string str1 = mJObj8.ToString();
- Console.WriteLine("before delete:\n" + str1);
- IList<JToken> delList = new List<JToken>(); //存储需要删除的项
- foreach (var ss in mJObj8) //查找某个字段与值
- {
- if (((JObject)ss)["a"].ToString() == "aa")
- delList.Add(ss);
- }
- foreach (var item in delList) //移除mJObj 在delList 里的项
- {
- mJObj8.Remove(item);
- }
- string str2 = mJObj8.ToString();
- Console.WriteLine("after delete:\n" + str2);
- #endregion
- #region json其它用法
- Console.WriteLine("\n\n9--json其它用法:");
- string jsonStr9_1 = @"
- [{'Languages':['C#','Java'],'Name':'李志伟','Sex':true},
- {'Languages':['C#','C++'],'Name':'Coder2','Sex':false},
- {'Languages':['C#','C++','C','Java'],'Name':'Coder3','Sex':true}]";
- Console.WriteLine(jsonStr9_1);
- #region 使用JsonTextReader类进行只进读取(不常用)
- Console.WriteLine("\n9_1--使用JsonTextReader类进行只进读取:");
- JsonTextReader json1 = new JsonTextReader(new StringReader(jsonStr9_1));
- while (json1.Read())
- {
- Console.WriteLine(json1.Value + "--" + json1.TokenType + "--" + json1.ValueType);
- }
- #endregion
- #region 使用JArray、JObject、JToken进行读取(常用)
- Console.WriteLine("\n9_2--使用JArray、JObject、JToken进行读取:");
- string jsonStr9_2 = @"
- [{'Languages':['C#','Java'],'Name':'李志伟','Sex':true},
- {'Languages':['C#','C++'],'Name':'Coder2','Sex':false},
- {'Languages':['C#','C++','C','Java'],'Name':'Coder3','Sex':true}]";
- var Jobj = JArray.Parse(jsonStr9_2);
- string mystr1 = Jobj.ToString();
- Console.WriteLine("this json:\n" + mystr1);
- JArray ja = (JArray)JsonConvert.DeserializeObject(jsonStr9_2);
- foreach (JToken jt in ja)
- {
- JObject jo = (JObject)jt;
- JArray temp = (JArray)jo["Languages"];
- foreach (JToken token in temp)
- {
- Console.Write(token + " ");
- }
- Console.WriteLine("\t" + jo["Name"] + "\t" + jo["Sex"]);
- }
- #endregion
- #region Json时间字符串的处理
- Console.WriteLine("\nJson9_3--时间字符串的处理:");
- DateTime time = DateTime.Now;
- //这里使用自定义日期格式
- IsoDateTimeConverter timeConverter = new IsoDateTimeConverter();
- timeConverter.DateTimeFormat = "北京时间:yyyy-MM-dd HH:mm:ss";
- //序列化时间
- string JsonStr = JsonConvert.SerializeObject(time, timeConverter);
- Console.WriteLine(JsonStr);
- //反序列化时间
- DateTime time2 = JsonConvert.DeserializeObject<DateTime>(JsonStr, timeConverter);
- Console.WriteLine(time2);
- Console.WriteLine("\n\n");
- #endregion
- #endregion
- }
- }
- }