C# 将JsonSerializerSettings中的null更改为空
在我的asp.NETMVC项目中,我使用azure缓存作为缓存提供程序 我使用这个方法用JsonSerializerSettings序列化我的数据C# 将JsonSerializerSettings中的null更改为空,c#,json,asp.net-mvc,serialization,C#,Json,Asp.net Mvc,Serialization,在我的asp.NETMVC项目中,我使用azure缓存作为缓存提供程序 我使用这个方法用JsonSerializerSettings序列化我的数据 public static JsonSerializerSettings GetDefaultSettings() { JsonSerializerSettings settings = new JsonSerializerSettings { TypeN
public static JsonSerializerSettings GetDefaultSettings()
{
JsonSerializerSettings settings = new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All,
TypeNameAssemblyFormat = FormatterAssemblyStyle.Simple,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
NullValueHandling = NullValueHandling.Ignore,
Binder = new TypeManagerSerializationBinder(),
ContractResolver = new PrivateSetterContractResolver()
};
settings.Converters.Add(new IsoDateTimeConverter { DateTimeStyles = DateTimeStyles.RoundtripKind });
return settings;
}
我的目标是这样的
{
"Name": "Bad Boys III",
"Description": "It's no Bad Boys",
"Classification": null,
"Studio": null,
"ReleaseCountries": null
}
一切都正常,但我想返回“{}”,而不是null列的null
{
"Name": "Bad Boys III",
"Description": "It's no Bad Boys",
"Classification": {},
"Studio": {},
"ReleaseCountries": {}
}
是否有任何配置可以为我执行此操作?您需要调整自定义ContractResolver。它可能看起来像这样(我没有测试它):
JsonSerializerSettings设置=新的JsonSerializerSettings
{
...
ContractResolver=新的MyCustomContractResolver()
};
公共类MyCustomContractResolver:Newtonsoft.Json.Serialization.DefaultContractResolver
{
受保护的重写IList CreateProperties(类型类型,MemberSerialization MemberSerialization)
{
返回类型.GetProperties().Select(p=>
{
var property=base.CreateProperty(p,memberSerialization);
property.ValueProvider=新的MyCustomNullValueProvider(p);
归还财产;
}).ToList();
}
}
公共类MyCustomNullValueProvider:IValueProvider
{
PropertyInfo_MemberInfo;
公共MyCustomNullValueProvider(PropertyInfo memberInfo)
{
_MemberInfo=MemberInfo;
}
公共对象GetValue(对象目标)
{
对象值=\u MemberInfo.GetValue(目标);
如果(值==null)
结果=“{}”;
其他的
返回值;
}
public void SetValue(对象目标、对象值)
{
如果((字符串)值==“{}”)
值=空;
_MemberInfo.SetValue(目标,值);
}
}
也可以看到这个答案:stringjson=jsonstring.Replace(“null”,“{}”);我正在使用此方法反序列化公共对象反序列化(Stream){JsonSerializer serializer=JsonSerializer.Create(this.Settings);JsonReader=new JsonTextReader(new StreamReader(Stream,Encoding.UTF8));返回serializer.deserialize(reader);}不确定,但你可以尝试在你的模型上使用这个[DefaultValue(“”)公共字符串followEmailAddress{get;set;},中间有一个空文本,一个空的JSONonjectReference@Amir:我原来的答案可能是错误的,不起作用,所以我更新了它。调整您的自定义ContractResolver应该是您的最佳选择,请参阅我的更新答案。。。
JsonSerializerSettings settings = new JsonSerializerSettings
{
...
ContractResolver= new MyCustomContractResolver()
};
public class MyCustomContractResolver : Newtonsoft.Json.Serialization.DefaultContractResolver
{
protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
{
return type.GetProperties().Select( p =>
{
var property = base.CreateProperty(p, memberSerialization);
property.ValueProvider = new MyCustomNullValueProvider(p);
return property;
}).ToList();
}
}
public class MyCustomNullValueProvider : IValueProvider
{
PropertyInfo _MemberInfo;
public MyCustomNullValueProvider(PropertyInfo memberInfo)
{
_MemberInfo = memberInfo;
}
public object GetValue(object target)
{
object value = _MemberInfo.GetValue(target);
if (value == null)
result = "{}";
else
return value;
}
public void SetValue(object target, object value)
{
if ((string)value == "{}")
value = null;
_MemberInfo.SetValue(target, value);
}
}