netcore System.Text.Json

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public class Demo1
{
    public string a1 { get; set; }
    public int b2 { get; set; }
    public Demo2 c3 { get; set; }
}
public class Demo2
{
    public string c3 { get; set; }
}

var json = System.Text.Json.JsonSerializer.Serialize(new Demo1
{
    a1 = "123",
    b2 = 123,
    c3 = new Demo2
    {
        c3 = "456"
    }
});
var arr = System.Text.Json.JsonDocument.Parse(json);
var val1 = arr.RootElement.GetProperty("a1").GetString();
var val2 = arr.RootElement.GetProperty("b2").GetInt16();
var val3 = arr.RootElement.GetProperty("c3").GetProperty("c3").GetString();
var obj = System.Text.Json.JsonSerializer.Deserialize<Demo1>(json);