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JSON字符串

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C#生成方法

Newtonsoft

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String apiClass = "apiClass";
String apiCommand = "apiCommand";
JObject postedJObject = new JObject();
postedJObject.Add("class", apiClass);
postedJObject.Add("cmd", apiCommand);

String param1 = "param1";
String param2 = "param2";
JObject apiJsonParam = new JObject();
apiJsonParam.Add("param1", param1);
apiJsonParam.Add("param2", param2);
postedJObject.Add("param", apiJsonParam);
apiJsonParam["param1"] = param1);
apiJsonParam["param2"] = param2);
postedJObject["param"] = apiJsonParam;

JArray jArray = new JArray();
JObject arr1 = new JObject();
arr1.Add("arr1", "this is arr1");
jArray.Add(arr1);
JObject arr2 = new JObject();
arr2.Add("arr2", "this is arr2");
jArray.Add(arr2);
postedJObject.Add("jarray", jArray);
String paramString = postedJObject.ToString(Newtonsoft.Json.Formatting.Indented, null);

输出结果为

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{
  "class": "apiClass",
  "cmd": "apiCommand",
  "param": {
    "param1": "param1",
    "param2": "param2"
  },
  "jarray": [
    {
      "arr1": "this is arr1"
    },
    {
      "arr2": "this is arr2"
    }
  ]
}

序列化

string StrJson = JsonConvert.SerializeObject(Classobj);

读取保存JSON文件

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string json = string.Empty;
using (FileStream fs = new FileStream(filepath, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite))
{
  using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("gb2312")))
  {
    json = sr.ReadToEnd().ToString();
  }
}

string json = GetFileJson(filepath);  

using (FileStream fs = new FileStream(fileFullPath, FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite, FileShare.ReadWrite))
{
    fs.Seek(0, SeekOrigin.Begin);
    fs.SetLength(0);
    using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
    {
        sw.WriteLine(strJson);
    }
}

反序列化

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ClassA a = JsonConvert.DeserializeObject<ClassA>(strResult);


List<Student> lstStuModel = new List<Student>()
{
new Student(){ID=1,Name="Name1",Age=250,Sex="男"},
new Student(){ID=2,Name="Name2",Age=300,Sex="女"}
};

//Json.NET序列化
string jsonData = JsonConvert.SerializeObject(lstStuModel);

//Json.NET反序列化
string json = @"{ 'Name':'Name1','Age':'3000','ID':'1','Sex':'女'}";
Student descJsonStu = JsonConvert.DeserializeObject<Student>(json);//反序列化
Student descJsonStu = JsonConvert.DeserializeObject<Student>(json, Formatting.Indented);//反序列化, 加缩进
Console.WriteLine(string.Format("反序列化： ID={0},Name={1},Sex={2},Sex={3}", descJsonStu.ID, descJsonStu.Name, descJsonStu.Age, descJsonStu.Sex));
Console.ReadKey();
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//序列化时默认都是处理公共成员，如果需要处理非公共成员，就要在该成员上加特性[JsonProperty]
//类中所有公有成员会被序列化，如果不想被序列化，可以用特性JsonIgnore
[JsonObject(MemberSerialization.OptOut)]
class TestItem
{
  [JsonProperty]
  private int testNo;
  [JsonIgnore]
  public string testItem;
  public string testValue;
}
//所有的成员不会被序列化，类中的成员只有标有特性JsonProperty的才会被序列化
[JsonObject(MemberSerialization.OptIn)]
class TestItem1
{
  [JsonIgnore]
  public string testItem;
  public string testValue;
}

其他格式

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//序列化时忽略空值
public class Data
{
    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string itemResult;

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string equipmentData;
}
//自定义时间格式
class CustomDateTimeConverter : IsoDateTimeConverter
{
    public CustomDateTimeConverter()
    {
        base.DateTimeFormat = "yyyy-MM-dd HH:mm:ss.fff";
    }
}
[JsonConverter(typeof(CustomDateTimeConverter))]
public DateTime sendTime;

//自定义序列化名称
[JsonProperty(PropertyName = "CName")]
public string Name { get; set; }

全局设置(常用)

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Newtonsoft.Json.JsonSerializerSettings setting = new Newtonsoft.Json.JsonSerializerSettings();
JsonConvert.DefaultSettings = new Func<JsonSerializerSettings>(() => {
    //日期类型默认格式化处理
    setting.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;
    setting.DateFormatString = "yyyy-MM-dd HH:mm:ss.ffff"; 
    //空值处理
    setting.NullValueHandling = NullValueHandling.Ignore; 
    //自定义类型转换
    setting.Converters.Add(new 自定义类型转换()); 
    return setting;
});
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Newtonsoft.Json.JsonSerializerSettings setting = new Newtonsoft.Json.JsonSerializerSettings {
    //日期类型默认格式化处理
    setting.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;
    setting.DateFormatString = "yyyy-MM-dd HH:mm:ss.ffff"; 
    //空值处理
    setting.NullValueHandling = NullValueHandling.Ignore; 
    //自定义类型转换
    setting.Converters.Add(new 自定义类型转换()); 
    return setting;
});

匿名类型生成Json字符串

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var obj = new {
  Name = "Jone",
  Age = 18,
  Address = new {
    Street = "123 St",
    City = "Shanghai"
  }
};

string jsonString = JsonConvert.SerializeObject(obj, Formatting.Indented);