How Can I Serialize and Deserialize Class Fields with System.Text.Json?

Use System.Text.Json to serialize and deserialize class fields

The .NET Core 3.x version of System.Text.Json does not natively support serialization and deserialization of class fields. This can be a problem for classes that rely heavily on fields for data storage.

To solve this problem, System.Text.Json provides two different methods depending on the .NET version:

.NET Core 3.x

Unfortunately, in .NET Core 3.x, System.Text.Json does not support fields. To overcome this limitation, you need to create a custom converter to handle the serialization and deserialization of the fields.

.NET 5 and above

Starting in .NET 5, public fields can be serialized by setting the JsonSerializerOptions.IncludeFields property to true. Alternatively, you can explicitly mark the fields for serialization using the [JsonInclude] attribute. An example is as follows:

<code class="language-csharp">using System.Text.Json;

public class Car
{
    public int Year { get; set; }
    [JsonInclude]
    public string Model;
}

static void SerializeWithFields()
{
    var car = new Car { Model = "Fit", Year = 2008 };
    var options = new JsonSerializerOptions { IncludeFields = true };
    var json = JsonSerializer.Serialize(car, options);
    Console.WriteLine(json); // {"Model": "Fit", "Year": 2008}
}</code>

By leveraging these techniques, you can ensure that your classes can be serialized and deserialized efficiently using System.Text.Json, even when dealing with class fields.

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