在将Json.Net与ItemRequired = Required一起反序列化时忽略属性 [英] Ignore a property when deserializing using Json.Net with ItemRequired = Required.Always

问题描述

我正在使用Json.Net将类序列化和反序列化为json并返回.

I'm using Json.Net to serialize and deserialize classes to json and back.

我在标有[JsonObject(ItemRequired = Required.Always)](或Required.Always)的类中添加了一个新的仅获取属性.结果为以下JsonSerializationException

I added to a class marked with [JsonObject(ItemRequired = Required.Always)] (or Required.Always) a new get-only property. That results in the following JsonSerializationException:

Newtonsoft.Json.JsonSerializationException:在JSON中找不到必需的属性'<PropertyName>'

我认为用JsonIgnore标记该属性可以解决问题，但这不起作用.

I thought marking that property with JsonIgnore would solve the issue, but that doesn't work.

如何告诉Json.Net应该忽略此属性?

How can I tell Json.Net that this property should be ignored?

这是重现此问题的一个最小示例:

Here's a minimal example reproducing the issue:

[JsonObject(ItemRequired = Required.Always)]
public class Hamster
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    [JsonIgnore]
    public string FullName { get { return FirstName + LastName; }}
}

private static void Main()
{
    var hamster = new Hamster {FirstName = "Bar", LastName = "Arnon"};
    var serializeObject = JsonConvert.SerializeObject(hamster);
    var deserializeObject = JsonConvert.DeserializeObject<Hamster>(serializeObject);
}

推荐答案

显然，在这种情况下，JsonIgnore仅控制序列化.需要JsonIgnore来指定FullName属性不应序列化为json表示形式.

Evidently JsonIgnore will only control the serialization in this case. JsonIgnore is required to specify that the FullName property should not be serialized to the json representation.

要在反序列化期间忽略该属性，我们需要在JsonProperty注释中添加Required = Required.Default(这表示不需要).

To ignore the property during deserialization we need to add the JsonProperty annotation with Required = Required.Default (which means not required).

因此，这是避免JsonSerializationException的方法:

So, this is how to avoid the JsonSerializationException:

[JsonObject(ItemRequired = Required.Always)]
public class Hamster
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    [JsonIgnore]
    [JsonProperty(Required = Required.Default)]
    public string FullName { get { return FirstName + LastName; }}
}

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