Gets the NullableContext of a certain position

roslyn_nullable_context.linq

<Query Kind="Program">
  <NuGetReference>Microsoft.CodeAnalysis</NuGetReference>
  <NuGetReference>Microsoft.CodeAnalysis.Compilers</NuGetReference>
  <NuGetReference>Microsoft.CodeAnalysis.CSharp</NuGetReference>
  <Namespace>Microsoft.CodeAnalysis</Namespace>
  <Namespace>Microsoft.CodeAnalysis.CSharp</Namespace>
  <Namespace>Microsoft.CodeAnalysis.CSharp.Syntax</Namespace>
</Query>

void Main()
{
    string text = @"
        public class MyClass
        {
        #nullable enable
            public string? Get() => null;

        #nullable disable
             public string GetNonNull() => null;
        }";
    SyntaxTree tree = CSharpSyntaxTree.ParseText(text);
    PortableExecutableReference mscorlib = MetadataReference.CreateFromFile(typeof(object).Assembly.Location);
    CSharpCompilation compilation = CSharpCompilation.Create("RefitCompilation", syntaxTrees: new[] { tree }, references: new[] { mscorlib });
    SemanticModel semanticModel = compilation.GetSemanticModel(tree);

    var methods = tree.GetRoot().DescendantNodes().OfType<MethodDeclarationSyntax>();
    MethodDeclarationSyntax nonGenericMethodSyntax = methods.First();
    semanticModel.GetNullableContext(nonGenericMethodSyntax.SpanStart).Dump("Should be Enabled");

    MethodDeclarationSyntax nonGenericMethodNonNull = methods.Skip(1).First();
    semanticModel.GetNullableContext(nonGenericMethodNonNull.SpanStart).Dump("Should be Disabled");
}

sroslyn_nullable_context.linq

<Query Kind="Program">
  <NuGetReference>Microsoft.CodeAnalysis</NuGetReference>
  <NuGetReference>Microsoft.CodeAnalysis.Compilers</NuGetReference>
  <NuGetReference>Microsoft.CodeAnalysis.CSharp</NuGetReference>
  <Namespace>Microsoft.CodeAnalysis</Namespace>
  <Namespace>Microsoft.CodeAnalysis.CSharp</Namespace>
  <Namespace>Microsoft.CodeAnalysis.CSharp.Syntax</Namespace>
</Query>

void Main()
{
    string text = @"
        public class MyClass
        {
            public string? Get() => null;
            
        #nullable enable
            public string? Get() => null;
            
        #nullable disable
             public string GetNonNull() => null;
        }";
    SyntaxTree tree = CSharpSyntaxTree.ParseText(text);
    PortableExecutableReference mscorlib = MetadataReference.CreateFromFile(typeof(object).Assembly.Location);
    CSharpCompilation compilation = CSharpCompilation.Create("RefitCompilation", syntaxTrees: new[] { tree }, references: new[] { mscorlib });
    SemanticModel semanticModel = compilation.GetSemanticModel(tree);
    
    var methods = tree.GetRoot().DescendantNodes().OfType<MethodDeclarationSyntax>();

    MethodDeclarationSyntax nonGenericMethodSyntaxCI = methods.First();
    semanticModel.GetNullableContext(nonGenericMethodSyntaxCI.SpanStart).Dump("Should be ContextInherited");

    MethodDeclarationSyntax nonGenericMethodSyntax = methods.Skip(1).First();
    semanticModel.GetNullableContext(nonGenericMethodSyntax.SpanStart).Dump("Should be Enabled");

    MethodDeclarationSyntax nonGenericMethodNonNull = methods.Skip(2).First();
    semanticModel.GetNullableContext(nonGenericMethodNonNull.SpanStart).Dump("Should be Disabled");
}