Import deserialized System.Text.Json data into current type

Question

I want to import json data from within the class which is the target of the deserialization. Is this possible with System.Text.Json without additional mapping? Ideally I would use "this" instead of the generic type parameter. I know that is impossible, but is there a similar option? Here is my test code which works, because it creates the data object only to map it to the property. Ideally, I would not need to instantiate "Test" twice.

public class Test
{
    public string? Bar { get; set; }
    
    public void ImportJson(string payload)
    {
        var data = System.Text.Json.JsonSerializer.Deserialize<Test>(payload);
        Bar = data?.Bar; // Don't want to map
    }
}

string foo = "{ \"Bar\": \"baz\" }";
var t = new Test();
t.ImportJson(foo);
Console.WriteLine(t.Bar);

Answer 1

you can try something like this

    string foo = "{ \"Bar\": \"baz\" }";
    var t = new Test();
    t.Deserialize(foo);

    Console.WriteLine(t.Instance.Bar);

classes

public static class Util
{
    public static void Deserialize<T>(this T obj, string json) where T : IImportJson<T>
    {
        obj.Instance=System.Text.Json.JsonSerializer.Deserialize<T>(json);
    }
}

public class Test : ImportJson<Test>
{
    public string? Bar { get; set;}
    
}

public interface IImportJson<T>
{
    public T Instance { get; set; }
}
public class ImportJson<T>: IImportJson<T>
{
    public T Instance { get; set; }
}

if class dosn't have many properies, it could be like this too

public interface IImportJson<T>
{
    public void ImportJson (T obj);
}
public class Test : IImportJson<Test>
{
    public string? Bar { get; set; }
    
    public void ImportJson(Test test)
    {
        Bar=test.Bar;
    }
}