I am trying to migrate from Newtonsoft.Json to System.Text.Json However, I ran into a problem since I was using DefaultContractResolver. My "custom" behaviour have these rules for property serialization:
Example:
class Car
{
[ReadOnly]
public string Id { get; set; }
public string Name { get; set; }
public Person Owner { get; set; }
}
class Person
{
[ReadOnly]
public string Id { get; set; }
public string Name { get; set; }
}
Now, imagine, we have this data if no rules would apply.
{
"Id":"1234",
"Name":"Skoda",
"Owner":{
"Id":"abcd",
"Name":null
}
}
Now, if I serialize the object, I would like to get this instead.
{
"Name":"Skoda"
}
In order to ignore individual properties, you need to use the [JsonIgnore] attribute along with one of these conditions:
Always;Never;WhenWritingDefault;WhenWritingNull.You can also define a default ignore condition through the JsonSerializerOptions type.
If additional behavior is needed, you should write a custom converter.
Example:
class Person
{
[JsonIgnore(Condition = JsonIgnoreCondition.Always)]
public string Id { get; set; }
[JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
public string Name { get; set; }
}
More information:
How to ignore properties with System.Text.Json
How to write custom converters for JSON serialization (marshalling) in .NET