deserialize non-nullable

Hello, I want to deserialize JSON with

System.Text.Json.JsonSerializer

System.Text.Json.JsonSerializer

. I have classes with

required

required

properties and it by default throws an exception if any required property is missing, which is nice, I guess. But why doesn't it throw exceptions when I have nullable reference types and the value is null:

#nullable enable
public class Test
{
    public required string Foo { get; init; }
}

#nullable enable
public class Test
{
    public required string Foo { get; init; }
}

{}

{}

is bad json - missing Foo; expected exception
-

{"Foo": 23}

{"Foo": 23}

is bad json - 23 is not a string; expected exception
-

{"Foo": null}

{"Foo": null}

is surprisingly perfectly fine. However, I would expect an exception, because null is not a valid string value in this context (Foo's type is not annotated with

string?

string?

)

Is there any option that I can turn on to throw on null value? I didn't find one.

I think I understand that nullable

is only for static analysis, but I would still expect different behavior. The deserializer can check with reflection if the

is there, right? Am I missing something?

C#•2y ago•

14 replies

possix

deserialize non-nullable

Hello, I want to deserialize JSON with

System.Text.Json.JsonSerializer

System.Text.Json.JsonSerializer

. I have classes with

required

required

#nullable enable
public class Test
{
    public required string Foo { get; init; }
}

#nullable enable
public class Test
{
    public required string Foo { get; init; }
}

{}

{}

is bad json - missing Foo; expected exception
-

{"Foo": 23}

{"Foo": 23}

is bad json - 23 is not a string; expected exception
-

{"Foo": null}

{"Foo": null}

is surprisingly perfectly fine. However, I would expect an exception, because null is not a valid string value in this context (Foo's type is not annotated with

string?

string?

)

Is there any option that I can turn on to throw on null value? I didn't find one.

I think I understand that nullable

is only for static analysis, but I would still expect different behavior. The deserializer can check with reflection if the

is there, right? Am I missing something?

deserialize non-nullable

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