Possible regression: ConfigurationBinder cannot bind private properties of base classes

[lateapexearlyspeed]

Description

In recent main branch, I found seems ConfigurationBinder cannot bind private properties of base classes, but before that, it can (for example .net 3, 5, 6).

In .net 3, 5, 6:

Recent main branch (I add an test case to show result):

        [Fact]
        public void CanBindPrivatePropertiesFromBaseClass()
        {
            ConfigurationBuilder configurationBuilder = new();
            configurationBuilder.AddInMemoryCollection(new Dictionary<string, string>
            {
                { "PrivateProperty", "a" }
            });
            IConfiguration config = configurationBuilder.Build();

            var test = new ClassOverridingVirtualProperty();
            config.Bind(test, b => b.BindNonPublicProperties = true);
            Assert.Equal("a", test.ExposePrivatePropertyValue());
        }

        public class BaseClassWithVirtualProperty
        {
            private string? PrivateProperty { get; set; }

            public string? ExposePrivatePropertyValue() => PrivateProperty;
        }

        public class ClassOverridingVirtualProperty : BaseClassWithVirtualProperty
        {
        }

I raised PR to try to fix that, meantime can handle virtual properties.

Reproduction Steps

As above.

Expected behavior

ConfigurationBinder may should be able to bind private properties of base classes.

Actual behavior

ConfigurationBinder cannot bind private properties of base classes in recent main branch.

Regression?

Yes, it did.

Known Workarounds

No response

Configuration

Found this from main branch with commit version: 2ce8130, at least.

Other information

I raised PR to try to fix that, meantime can handle virtual properties.

[ghost]

Tagging subscribers to this area: @dotnet/area-extensions-configuration
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

In recent main branch, I found seems ConfigurationBinder cannot bind private properties of base classes, but before that, it can (for example .net 3, 5, 6).

In .net 3, 5, 6:

Recent main branch (I add an test case to show result):

        [Fact]
        public void CanBindPrivatePropertiesFromBaseClass()
        {
            ConfigurationBuilder configurationBuilder = new();
            configurationBuilder.AddInMemoryCollection(new Dictionary<string, string>
            {
                { "PrivateProperty", "a" }
            });
            IConfiguration config = configurationBuilder.Build();

            var test = new ClassOverridingVirtualProperty();
            config.Bind(test, b => b.BindNonPublicProperties = true);
            Assert.Equal("a", test.ExposePrivatePropertyValue());
        }

        public class BaseClassWithVirtualProperty
        {
            private string? PrivateProperty { get; set; }

            public string? ExposePrivatePropertyValue() => PrivateProperty;
        }

        public class ClassOverridingVirtualProperty : BaseClassWithVirtualProperty
        {
        }`

### Reproduction Steps

As above.

### Expected behavior

`ConfigurationBinder` may should be able to bind private properties of base classes.

### Actual behavior

`ConfigurationBinder` cannot bind private properties of base classes in recent main branch.

### Regression?

Yes, it did.

### Known Workarounds

_No response_

### Configuration

Found this from main branch with commit version: 2ce8130f4bf4b02393b95719edb0f9d5c6ee1776, at least.

### Other information

I raised [PR](https://github.com/dotnet/runtime/pull/71039) to try to fix that, meantime can handle virtual properties.

<table>
  <tr>
    <th align="left">Author:</th>
    <td>lateapexearlyspeed</td>
  </tr>
  <tr>
    <th align="left">Assignees:</th>
    <td>-</td>
  </tr>
  <tr>
    <th align="left">Labels:</th>
    <td>

`area-Extensions-Configuration`

</td>
  </tr>
  <tr>
    <th align="left">Milestone:</th>
    <td>-</td>
  </tr>
</table>
</details>

[eerhardt]

cc @pedrobsaila. Looks like this might be a regression from #70592.

[lateapexearlyspeed]

@eerhardt Thanks. Yes I noticed that PR before I raise my PR to fix. In short, I turn to keep using loop to retrieve all layers of properties (as .net 3/5/6) to be able to get also private properties (I guess this is reason to loop before). Meantime take care virtual and non virtual ones (even if with same names). Please review, thanks!

[lateapexearlyspeed]

Hi @eerhardt, any chance to have a look at PR above ? :)