Newtonsoft.Json基础问题

Newtonsoft.Json基础问题

它是.NET下的一个序列化、反序化的基础类库，更基础的用法还是看别人的吧，这里只说一些遇到的问题。

设置下划线

ContractResolver 默认是小驼峰，我想改成下划线方式，遇到了一些问题，dictionary的键未格式化

in controller 创建一个控制器

[HttpGet("getDictionary")] public IDictionary<string, string> GetDictionary() { 
    IDictionary<string, string> dics = new Dictionary<string, string>(); dics.Add("Key", "Value"); dics.Add("Key_Test", "Value_Test"); return dics; } 

In Startup.cs

services .AddMvc() .SetCompatibilityVersion(CompatibilityVersion.Version_2_2) .AddJsonOptions(opt => { 
    // 设置下划线方式，首字母是小写 opt.SerializerSettings.ContractResolver = new DefaultContractResolver() { 
    NamingStrategy = new SnakeCaseNamingStrategy() }; }); 

此时运行后，得到的是Key,而不是key，我想他的键都变成下划线方式的小写

{ 
    "Key": "Value", "KeyTest": "Value_Test" } 

其他测试，增加多级，测试正常

[HttpGet("get")] public dynamic Get() { 
    return new { 
    Content = new { 
    Url=Request.Path.Value, NewUrlTest="test in new url test" } }; } 

此时运行后，满足要求，多层结构也不会影响

{ 
    "content": { 
    "url": "/test/get", "new_url_test": "test in new url test" } } 

services .AddMvc() .SetCompatibilityVersion(CompatibilityVersion.Version_2_2) .AddJsonOptions(opt => { 
    // 设置下划线方式，首字母是小写 opt.SerializerSettings.ContractResolver = new DefaultContractResolver() { 
    NamingStrategy = new SnakeCaseNamingStrategy { 
    ProcessDictionaryKeys = true } }; }); 

{ 
    "key": "Value", "key_test": "Value_Test" } 

实现时间戳

前台要的格式为 34,只有一个数字，我搜索了一下，也没找到相关的文档，本身这个类库有一些时间戳，不过他们都包含特殊字符，如/Date(34)/,好像类似这样，他好像在逗我，为啥他要加Date，怕是有毒吧。看到
他有Converters属性可配置，即配置自己的序列化返回格式。

services.AddMvc() .SetCompatibilityVersion(CompatibilityVersion.Version_2_2) .AddJsonOptions(opt => { 
    //opt.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:MM:ss"; //设置时间戳格式 opt.SerializerSettings.Converters = new List<JsonConverter>() { 
    new LinCmsTimeConverter() }; }); 

这里的时间戳是毫秒级别

/// 
 /// 配合LinCMS中的时间戳 后台只返回 34 ///  public class LinCmsTimeConverter : DateTimeConverterBase { 
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { 
    double javaScriptTicks = 0; if (value is DateTime dateTime) { 
    javaScriptTicks = ConvertDateTimeInt(dateTime); } else { 
    if (!(value is DateTimeOffset dateTimeOffset)) throw new JsonSerializationException("Expected date object value."); javaScriptTicks = ConvertDateTimeInt(dateTimeOffset.ToUniversalTime().UtcDateTime); } writer.WriteValue(javaScriptTicks); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { 
    return ConvertIntDateTime(double.Parse(reader.Value.ToString())); } /// 
 /// 日期转换为时间戳（时间戳单位毫秒） ///  ///  /// 
     public static DateTime ConvertIntDateTime(double milliseconds) { 
    return new DateTime(1970, 1, 1).AddMilliseconds(milliseconds); } public static double ConvertDateTimeInt(DateTime aDt) { 
    return (aDt - new DateTime(1970, 1, 1)).TotalMilliseconds; } } 

参考

• https://github.com/JamesNK/Newtonsoft.Json/issues/2088
• https://www.newtonsoft.com/json/help/html/P_Newtonsoft_Json_Serialization_NamingStrategy_ProcessDictionaryKeys.htm
• https://blog.csdn.net/yw1688/article/details/
• https://www.jianshu.com/p/c53b1a2a121d