Newtonsoft.Json ignores the DataContract feature

Little scum · Posted on 5/30/2018 4:50:17 PM

Newtonsoft.JsonAs you probably know, commonly used JSON serialization and deserialization tools

DataContractAttributeSpecifies that type to define or implement a data contract that can be serialized by a serializer such as DataContractSerializer. To make a type serializable, the type author must define a data contract for its type.

encountered a difficult problem,The parent class has the [DataContract] feature, and the child class inherits the parent class, and all the attributes of the subclass need to be serialized and deserialized with the [DataMember] attributeSince the parent class is someone else's encapsulated dll, the [DataContract] feature of the parent class cannot be deleted!

The test is as follows: Test1 class has the [DataContract] feature, if the attribute does not add the [DataMember] feature, it will cause serialization and deserialization to fail, as shown in the figure below:

We annotated the [DataContract] feature of class Test1 and found that it can be serialized and deserialized normally, as follows:

Is there any advanced use of Newtonsoft.Json that can ignore this feature? The answer is yes!

Just use the Json.Net's OptOut property. It will take precedence over the DataContract.

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//
      Abstract:
      All public members are serialized by default. Members can be excluded using Newtonsoft.Json.JsonIgnoreAttribute
      or System.NonSerializedAttribute. This is the default member serialization pattern.
      OptOut = 0，
      //
      Abstract:
      Only members labeled Newtonsoft.Json.JsonPropertyAttribute or System.Runtime.Serialization.DataMemberAttribute
      is serialized. This member serialization mode can also be set by tagging
      // class with System.Runtime.Serialization.DataContractAttribute.
      OptIn = 1，
      //
      Abstract:
      All public and private fields are serialized. Members can be excluded using Newtonsoft.Json.JsonIgnoreAttribute
      or System.NonSerializedAttribute. This member serialization pattern is also fine
      Set this by tagging the class with System.SerializableAttribute and setting the IgnoreSerializableAttribute
      Set Newtonsoft.Json.Serialization.DefaultContractResolver to false.
      Fields = 2

Test code:

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admin · Posted on 6/1/2018 1:20:10 PM

Determine whether a json string is an object or an array
Newtonsoft.Json.Linq.JToken s = Newtonsoft.Json.Linq.JToken.Parse(str);

switch (s.Type.ToString())
            {
                  case "Object":
                     break;
                  case "Array":
                     break;
                  default:
                     break;
            }

wz2988 · Posted on 8/21/2020 11:52:32 AM

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[Source] Newtonsoft.Json ignores the DataContract feature

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