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);
}

Charles · Accepted Answer · 2019-11-09 23:45:58Z

107

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

public int MyInt { get; set; }

answered Nov 9, 2019 at 23:45

Charles

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8 Comments

stuartd Over a year ago

If this is the case, then why on earth is it not documented?

stuartd Over a year ago

Reference: How to use class fields with System.Text.Json.JsonSerializer?

stuartd Over a year ago

Also this issue - JsonSerializer should support field as well as properties

dbc Over a year ago

@stuartd - it is documented. See How to serialize and deserialize JSON in .NET: Serialization behavior: By default, all public properties are serialized. You can specify properties to exclude... Currently, fields are excluded.

stuartd Over a year ago

@dbc “documented somewhere on the MS web site, which lets face it is a constantly shifting quicksand of information” is about 100 times less useful than “the behaviour of the method is documented in the method’s own documentation”!

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