JsonConvert:如何忽略值是特定数字的整数类型 [英] JsonConvert: How to ignore Integer types where the value is a specific number
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问题描述
有没有一种方法告诉JsonConvert当它们具有特定值时忽略整数类型值?我想使用整数类型的minValue而不是0作为默认类型,因为0是有效值.
Is there a way to tell JsonConvert to ignore integer type values when they have a specific value? I want to use the minValue of an Integer Type instead of 0 as the default type because 0 is a valid value.
推荐答案
Json.NET将尊重System.ComponentModel.DefaultValue
属性,因此您可以执行以下操作:
Json.NET will respect System.ComponentModel.DefaultValue
attribute, so you can do what you want like this:
class TestClass {
[DefaultValue(int.MinValue)]
public int Value { get; set; }
}
var ser = JsonConvert.SerializeObject(new TestClass() { Value = int.MinValue}, new JsonSerializerSettings
{
DefaultValueHandling = DefaultValueHandling.Ignore
});
// serializes to empty object {}
Console.WriteLine(ser);
var ser = JsonConvert.SerializeObject(new TestClass() { Value = 0}, new JsonSerializerSettings
{
DefaultValueHandling = DefaultValueHandling.Ignore
});
// serializes to {"Value" : 0}
Console.WriteLine(ser);
如果您不想装饰任何东西,可以使用自定义合同解析器:
If you don't want to decorate anything, you can use custom contract resolver:
class IntMinValueContractResolver : DefaultContractResolver {
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) {
var prop = base.CreateProperty(member, memberSerialization);
if (prop.PropertyType == typeof(int)) {
// for int properties, set default value and ignore it when serializing
// while populating while deserializing
prop.DefaultValue = int.MinValue;
prop.DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate;
}
return prop;
}
}
JsonConvert.DefaultSettings = () => new JsonSerializerSettings()
{
ContractResolver = new IntMinValueContractResolver()
};
// serializes to empty object {}
var ser = JsonConvert.SerializeObject(new TestClass() { Value = int.MinValue});
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