Config binder generator generates uncompilable code when a private nested type is used

[stephentoub]

This compiles fine:

using Microsoft.Extensions.Configuration;

internal class Program
{
    private static void Main() { }

    private static C Foo(IConfiguration configuration)
    {
        C c = new();
        configuration.Bind(c);
        return c;
    }

    internal sealed class C
    {
        public int Value { get; set; }
    }
}

but changing:

internal sealed class C

to

private sealed class C

produces an error about C being inaccessible, as the generator emits code into another class that tries to access that property.

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Issue Details

---

This compiles fine:

using Microsoft.Extensions.Configuration;

internal class Program
{
    private static void Main() { }

    private static C Foo(IConfiguration configuration)
    {
        C c = new();
        configuration.Bind(c);
        return c;
    }

    internal sealed class C
    {
        public int Value { get; set; }
    }
}

but changing:

internal sealed class C

to

private sealed class C

produces an error about C being inaccessible, as the generator emits code into another class that tries to access that property.

Author:	stephentoub
Assignees:	-
Labels:	area-Extensions-Configuration
Milestone:	-

[layomia]

I'd say the resolution would be to emit a diagnostic & omit code to support inaccessible members.

[layomia]

Needs RC-2 port of #91657.

[layomia]

Fixed for RC 2 - #91967.