System.Text.Json.JsonSerializer.Serialize returns empty Json object "{}" [duplicate]

Question

Environment: Visual Studio 2019 16.3.8, .NET 3.0.100, .NET Core 3.0 unit test.

All 3 calls below to System.Text.Json.JsonSerializer.Serialize return empty objects: "{}"

I must be doing something wrong ... but I just don't see it?

public class MyObj
{
    public int myInt;
}

[TestMethod]
public void SerializeTest()
{
    var myObj = new MyObj() { myInt = 99 };
    var txt1 = System.Text.Json.JsonSerializer.Serialize(myObj);
    var txt2 = System.Text.Json.JsonSerializer.Serialize(myObj, typeof(MyObj));
    var txt3 = System.Text.Json.JsonSerializer.Serialize<MyObj>(myObj);
}

Answer 1

im pretty sure the serializer doesn't work with fields. so use a property instead.

public int MyInt { get; set; }