JSON如何在反序列化期间忽略丢失的对象 [英] JSON how to ignore missing object during deserialization

问题描述

我有一个示例JSON，当我反序列化时得到对象引用未设置为对象实例"，因为我发现某些字段有时会丢失，然后它将再次出现.

I have a sample JSON that when i deserialize i get "object reference not set to instance of an object" because i found out some that sometimes the field is missing then it will reappear again.

json与此类似

{
    "title": "Example",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
        "age": {
            "description": "Age in years",
            "type": "integer",
            "minimum": 0
        }
    }

}

如果我反序列化并将其映射到相应的字段，结果就可以了

if i deserialize this and map it to the corresponding fields the result is OK

但是例如，如果缺少年龄"

but if for example the "Age" is missing

{
    "title": "Example",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
    },
    "required": ["firstName", "lastName"]
}

它将引发错误对象引用未设置为对象实例" 如果JSON中缺少年龄，我该如何忽略?

it will throw an error "object reference not set to instance of an object" how do i ignore the age if it's missing in JSON?

推荐答案

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更新 当你说你使用json.net

---

Update when you said you using json.net

我会说Json.net已有设置，请尝试以下

I will say there is setting for Json.net try the below

JsonSerializerSettings.NullValueHandling = NullValueHandling.Ignore

---

如果它是真正的POCO对象，则检查那里是否有任何带null的属性，然后再分配一个空白对象. 喜欢

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if its real POCO object, I check if any property there with null, I assigned then with blank object. like

if(MyObject.Properties.Age==null)
{
   MyObject.Properties.Age = new Age();
}

然后反序列化它.

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