Newtonsoft.Json序列化与反序列化时使⽤不同的属性名Newtonsoft.Json序列化与反序列化时使⽤不同的属性名称
⼀、需求
现有⼀个类IDCard：
public class IDCard<T>: WordsResult
{
public T address {get;t;}
public T name {get;t;}
public T birth {get;t;}
public T idno {get;t;}
public T gender {get;t;}
天津到济南public T nation {get;t;}
}
以及⼀段json字符串：
{"住址":"⼴东省深圳市福岗区笋岗西路30号","姓名":"栾韶","出⽣":"19660909","公民⾝份号码":"","性别":"男","民族":"回"}
我需要将字符串反序列化为IDCard对象，并且在⼀定的其它操作后再次将这个对象序列化后输出，同时输出的属性名⽤我⾃⼰定义的属性名。
我期望的输出结果：
{"address":"⼴东省深圳市福岗区笋岗西路30号","name":"栾韶","birth":"19660909","idno":"","gender":"男","nation":"回"}
⼆、JsonProperty
使⽤Newtonsoft.Json的JsonProperty特性
public class IDCard<T>: WordsResult
{
[JsonProperty(propertyName:"住址")]
public T address {get;t;}
93年什么命
[JsonProperty(propertyName:"姓名")]
public T name {get;t;}
[JsonProperty(propertyName:"出⽣")]
public T birth {get;t;}
[JsonProperty(propertyName:"公民⾝份号码")]
public T idno {get;t;}
[JsonProperty(propertyName:"性别")]
public T gender {get;t;}
[JsonProperty(propertyName:"民族")]
public T nation {get;t;}
}
反序列化时确实有效：
但重新将其序列化时：
{"住址":"⼴东省深圳市福岗区笋岗西路30号","姓名":"栾韶","出⽣":"19660909","公民⾝份号码":"","性别":"男","民族":"回"}返回的并不是我期望的结果
三、⾃定义Attribute
定义Attribute类的派⽣类OcrAttribute：
public class OcrAttribute : Attribute
掩耳盗铃什么意思{
public string ReadName {get;t;}
public string WriteName {get;t;}
public bool Readable {get;t;}
public bool Writable {get;t;}
public OcrAttribute()
{
this.Readable =true;
this.Writable =true;白唇鹿
}
}
并添加到IDCard中：
public class IDCard<T>: WordsResult
{
[Ocr(WriteName ="住址")]
public T address {get;t;}
[Ocr(WriteName ="姓名")]
public T name {get;t;}
[Ocr(WriteName ="出⽣")]
public T birth {get;t;}
[Ocr(WriteName ="公民⾝份号码")]
public T idno {get;t;}
[Ocr(WriteName ="性别")]
public T gender {get;t;}
[Ocr(WriteName ="民族")]
public T nation {get;t;}
}
四、⾃定义ContractResolver
定义DefaultContractResolver的派⽣类，⽐如OcrWriteResolver和OcrReadResolver：
public class OcrWriteResolver: DefaultContractResolver
{
养了一条蛇protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) {
var property = ba.CreateProperty(member, memberSerialization);
var attr = member.GetCustomAttribute(typeof(OcrAttribute))as OcrAttribute;
电力基础知识if(attr !=null)
{
property.PropertyName = attr.WriteName ?? property.PropertyName;
穿上衣服的英文
property.Writable = attr.Writable;
}
return property;
}
}
public class OcrReadResolver : DefaultContractResolver
{
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) {
var property = ba.CreateProperty(member, memberSerialization);
var attr = member.GetCustomAttribute(typeof(OcrAttribute))as OcrAttribute;
if(attr !=null)
{
property.PropertyName = attr.ReadName ?? property.PropertyName;
property.Readable = attr.Readable;
}
return property;
}
}
重写CreateProperty⽅法，动态地修改JsonProperty的相关属性
五、反序列化与序列化
反序列化：
var ttings =new JsonSerializerSettings(){ ContractResolver =new OcrWriteResolver()};
var result = JsonConvert.DerializeObject<IDCard<string>>(content);
序列化：
var ttings =new JsonSerializerSettings(){ ContractResolver =new OcrReadResolver()};
var str = JsonConvert.SerializeObject(result, ttings);
六、Readable与Writeable
JsonProperty.Readable：属性是否可以被序列化
JsonProperty.Writeable：属性是否可以被反序列化
在某些特定场景下，⽐如：
从某个上级接⼝中返回了很多参数，在经过⼀系列处理后需要返回给下级接⼝其中⼀部分参数。
如果单纯为属性添加JsonIgnore特性，会导致我们在反序列化上级接⼝返回的json字符串时也⽆法获取到这个参数（⽐如上级平台返回的errcode我们不需要返回给下级平台，但是⾃⾝⼜需要根据这个属
性来判断请求是否成功）。
在OcrAttribute中新增Writeable与Readable属性，并在OcrWriteResolver与OcrReadResolver的CreateProperty⽅法中动态修改property.Writable与property.Readable。
修改IDCard类，使得序列化时隐藏地址：
public class IDCard<T>: WordsResult
企业英文{
[Ocr(WriteName ="住址", Readable =fal)]
public T address {get;t;}
[Ocr(WriteName ="姓名")]
public T name {get;t;}
[Ocr(WriteName ="出⽣")]
public T birth {get;t;}
[Ocr(WriteName ="公民⾝份号码")]
public T idno {get;t;}
[Ocr(WriteName ="性别")]
public T gender {get;t;}
[Ocr(WriteName ="民族")]
public T nation {get;t;}
}
进⾏序列化操作：
⽬的达成
