C#•2y ago

deserialize non-nullable

Hello, I want to deserialize JSON with

System.Text.Json.JsonSerializer

System.Text.Json.JsonSerializer

System.Text.Json.JsonSerializer

System.Text.Json.JsonSerializer. I have classes with

required

required

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; }
}

#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}
```
{"Foo": 23}
```
{"Foo": 23}
is bad json - 23 is not a string; expected exception
```
{"Foo": null}
```
{"Foo": null}
```
{"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?
```
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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