How to Serialize and Deserialize Fields with System.Text.Json in .NET?

Serialize and deserialize fields using System.Text.Json

In .NET Core 3.x, System.Text.Json has a limitation: serialization and deserialization of fields are not supported. This can create challenges if a class requires field-based variables.

To solve this problem, there are two ways:

For .NET Core 3.x:

Unfortunately, fields are not supported in .NET Core 3.x. As mentioned in the documentation, it is possible to use a custom converter to achieve this functionality. However, this requires implementing a manual conversion process.

For .NET 5 and above:

In .NET 5 and above, public fields can be serialized and deserialized using System.Text.Json. There are two ways to achieve this:

1. JsonSerializerOptions

Enable field serialization by setting JsonSerializerOptions.IncludeFields to true.

var options = new JsonSerializerOptions { IncludeFields = true };
var json = JsonSerializer.Serialize(car, options);
var carDeserialized = JsonSerializer.Deserialize<Car>(json, options);

2. [JsonInclude] attribute

Alternatively, use the [JsonInclude] attribute to mark specific fields to be serialized.

public class Car
{
    [JsonInclude]
    public string Model;
}

By applying these techniques, you can ensure that class fields are serialized and deserialized correctly, thus saving data accurately between objects.

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