NullabilityInfoContext reports incorrect result when mixing AllowNull and DisallowNull #63846
Description
Description
The result does not match how the compiler interprets the attributes. See the reproduction.
Reproduction Steps
public void Main()
{
var context = new NullabilityInfoContext();
var hasAllowAndDisallowInfo = context.Create(typeof(HasMultipleCodeAnalysisAttributes).GetField("HasAllowAndDisallow")!);
Console.WriteLine(hasAllowAndDisallowInfo.ReadState); // NotNull as expected
Console.WriteLine(hasAllowAndDisallowInfo.WriteState); // Nullable; should be NotNull
}
private class HasMultipleCodeAnalysisAttributes
{
[AllowNull, DisallowNull]
public string HasAllowAndDisallow = string.Empty;
}Expected behavior
We should expect a NotNull write state because this is how the C# compiler interprets it:
new HasMultipleCodeAnalysisAttributes().HasAllowAndDisallow = null; // CS8625Actual behavior
Returns Nullable
Regression?
No response
Known Workarounds
No response
Configuration
VS 17.0.2, .NET 6, Windows 10 x64.
I don't have any reason to believe this is configuration specific.
Other information
CC @Shane32