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How to solve the problem of attribute value deserialization failure?
- 零下一度Original
- 2017-06-23 16:22:114299browse
Introduction: When I was developing the webapi interface, I encountered: When a complex Json string is deserialized into an object, one of the attribute objects cannot be serialized?
Usage:
InternalRecommendRequestFormModel formData = Newtonsoft.Json.JsonConvert.DeserializeObject<InternalRecommendRequestFormModel>(dataInput);
Among them: InternalRecommendRequestFormModel is a complex object, and its properties contain other objects and properties. dataInput is the JSON string passed in by the interface, which is the InternalRecommendRequestFormModel object returned by another interface. Of course, some properties of the data have changed during the transmission process. It should be deserialized normally, but it is deserialized when used. An error is reported and one of the attributes cannot be serialized.
So what should we do when we encounter this kind of complex deserialization into an object?
First of all: Analysis shows that the error is caused by the serialization failure of individual attributes, so as long as this part of the attributes can be cleared or the serialized content of the attribute can be removed, it will be fine.
So: How to remove some attributes from the serialized JSON string?
The first thing we think of is string replacement, clearing, interception, etc., but it is easy to make mistakes when thinking about it. Can we turn this string into an operable object (of course not InternalRecommendRequestFormModel), then kill or clear an object and then convert it into the object we want? Actually, when I first thought about object, isn’t any object an object?
Start trying:
object formData = Newtonsoft.Json.JsonConvert.DeserializeObject<object>(dataInput);
The object obtained is as follows:
Discovered during debugging:
((Newtonsoft.Json.Linq.JObject)(JsonConvert.DeserializeObject
In other words, as can be seen from the above code, the deserialized object object is converted into: Newtonsoft.Json.Linq.JObject object. This object is a base class of the JSON object provided by Microsoft. , that is to say, as long as you are an object, if it is serialized by json, it can help you deserialize it back.
The code is improved to:
InternalRecommendRequestFormModel formData = new InternalRecommendRequestFormModel();Newtonsoft.Json.Linq.JObject obj = JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JObject>(dataInput);
obj.Remove("opinions");
formData = obj.ToObject<InternalRecommendRequestFormModel>();Summary:
As long as JSON string is an object. When we directly deserialize and encounter that some attribute values in the string do not meet the requirements, we can first convert the object to: JObject, correct the object attributes, and then use the ToObject< provided by JObject ;T>() and then convert it to the object that needs to be converted
<strong><span style="font-size: 15px">Newtonsoft.Json.Linq.JObject obj = JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JObject>(dataInput);</span></strong><br>
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