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Add null checks before binding by filmor · Pull Request #2406 · pythonnet/pythonnet · GitHub

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Add null checks before binding #2406

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Add null checks before binding #2406

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14 changes: 6 additions & 8 deletions src/runtime/ClassManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -288,15 +288,13 @@ internal static void InitClassBase(Type type, ClassBase impl, ReflectedClrType p
Runtime.PyType_Modified(pyType.Reference);
}

internal static bool ShouldBindMethod(MethodBase mb)
{
return (mb.IsPublic || mb.IsFamily || mb.IsFamilyOrAssembly);
}
internal static bool ShouldBindMethod(MethodBase mb) =>
mb != null &&
(mb.IsPublic || mb.IsFamily || mb.IsFamilyOrAssembly);

internal static bool ShouldBindField(FieldInfo fi)
{
return (fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly);
}
internal static bool ShouldBindField(FieldInfo fi) =>
fi != null &&
(fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly);
Comment on lines -291 to +297

lostmsu Jul 1, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Doesn't this just mask issues? I don't remember if we have nullability annotations on, but I think if you want to add a check here, it should throw ArgumentNullException, and instead null should be handled at the call site.

filmor Jul 1, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It does mask issues, but in a non-failing way which is a lot better than raising during startup (which effectively renders this library useless). This is an adaptation of what fixes #2405. Throwing an exception here is (apart from having a slightly better stacktrace) effectively the same as leaving the code unchanged.

lostmsu Jul 1, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I mean I suggest to check for null at the call site which is what #2405 (comment) does, and optionally add an argument check in ShouldBindMethod to throw something better than NullReferenceException.

Simply returning false for null inputs is error-prone.

filmor Jul 1, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I don't agree, but I will also not put any more work into this. If you want to propose a different solution (in code), be my guest.

lostmsu Jul 1, 2024

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

@filmor opened #2409

internal static bool ShouldBindProperty(PropertyInfo pi)
{
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