Options binding fails on get-only IDictionary<,> properties

[jander-msft]

Description

When binding an options type that contains a public get-only property of type IDictionary<,>, the binding is skipped and the dictionary is not populated.

Reproduction Steps

namespace ConsoleApp38
{
 internal class Program
 {
 static void Main(string[] args)
 {
 IHost host = new HostBuilder()
 .ConfigureAppConfiguration(builder =>
 {
 builder.AddInMemoryCollection(new Dictionary<string, string?>()
 {
 { "DictionaryOptions:Key1", "Value1" }
 });
 })
 .ConfigureServices((context, services) =>
 {
 services.Configure<TestOptions>(context.Configuration);
 })
 .Build();

 IOptions<TestOptions> options = host.Services.GetRequiredService<IOptions<TestOptions>>();
 IDictionary<string, string> dictionaryOptions = options.Value.DictionaryOptions;
 Console.WriteLine("Count = {0}", dictionaryOptions.Count);
 }
 }

 public class TestOptions
 {
 public IDictionary<string, string> DictionaryOptions { get; }
 = new Dictionary<string, string>();
 }
}

Expected behavior

The dictionary property on the options instance should have one key-value pair. Console will write out "Count = 1".

Actual behavior

The dictionary property on the options instance has not key-value pairs. Console will write out "Count = 0".

Regression?

Yes, this worked in .NET 7 Preview 7, all prior previews, and all prior .NET (Core) versions.

Known Workarounds

Changing the property type to Dictionary<,> seems to work around this issue.

Configuration

Windows 11 x64 .NET SDK 7.0.100-rc.1.22431.12

Not specific to this configuration, it is failing on all OSes and all architectures in the dotnet-monitor PR builds when attempting to update to .NET 7 RC 1.

Other information

No response

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

Issue Details

---

Description

When binding an options type that contains a public get-only property of type IDictionary<,>, the binding is skipped and the dictionary is not populated.

Reproduction Steps

namespace ConsoleApp38
{
 internal class Program
 {
 static void Main(string[] args)
 {
 IHost host = new HostBuilder()
 .ConfigureAppConfiguration(builder =>
 {
 builder.AddInMemoryCollection(new Dictionary<string, string?>()
 {
 { "DictionaryOptions:Key1", "Value1" }
 });
 })
 .ConfigureServices((context, services) =>
 {
 services.Configure<TestOptions>(context.Configuration);
 })
 .Build();

 IOptions<TestOptions> options = host.Services.GetRequiredService<IOptions<TestOptions>>();
 IDictionary<string, string> dictionaryOptions = options.Value.DictionaryOptions;
 Console.WriteLine("Count = {0}", dictionaryOptions.Count);
 }
 }

 public class TestOptions
 {
 public IDictionary<string, string> DictionaryOptions { get; }
 = new Dictionary<string, string>();
 }
}

Expected behavior

The dictionary property on the options instance should have one key-value pair. Console will write out "Count = 1".

Actual behavior

The dictionary property on the options instance has not key-value pairs. Console will write out "Count = 0".

Regression?

Yes, this worked in .NET 7 Preview 7, all prior previews, and all prior .NET (Core) versions.

Known Workarounds

Changing the property type to Dictionary<,> seems to work around this issue.

Configuration

Windows 11 x64 .NET SDK 7.0.100-rc.1.22431.12

Not specific to this configuration, it is failing on all OSes and all architectures in the dotnet-monitor PR builds when attempting to update to .NET 7 RC 1.

Other information

No response

Author:	jander-msft
Assignees:	-
Labels:	untriaged, area-Extensions-Hosting
Milestone:	-

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

Issue Details

---

Description

When binding an options type that contains a public get-only property of type IDictionary<,>, the binding is skipped and the dictionary is not populated.

Reproduction Steps

namespace ConsoleApp38
{
 internal class Program
 {
 static void Main(string[] args)
 {
 IHost host = new HostBuilder()
 .ConfigureAppConfiguration(builder =>
 {
 builder.AddInMemoryCollection(new Dictionary<string, string?>()
 {
 { "DictionaryOptions:Key1", "Value1" }
 });
 })
 .ConfigureServices((context, services) =>
 {
 services.Configure<TestOptions>(context.Configuration);
 })
 .Build();

 IOptions<TestOptions> options = host.Services.GetRequiredService<IOptions<TestOptions>>();
 IDictionary<string, string> dictionaryOptions = options.Value.DictionaryOptions;
 Console.WriteLine("Count = {0}", dictionaryOptions.Count);
 }
 }

 public class TestOptions
 {
 public IDictionary<string, string> DictionaryOptions { get; }
 = new Dictionary<string, string>();
 }
}

Expected behavior

The dictionary property on the options instance should have one key-value pair. Console will write out "Count = 1".

Actual behavior

The dictionary property on the options instance has not key-value pairs. Console will write out "Count = 0".

Regression?

Yes, this worked in .NET 7 Preview 7, all prior previews, and all prior .NET (Core) versions.

Known Workarounds

Changing the property type to Dictionary<,> seems to work around this issue.

Configuration

Windows 11 x64 .NET SDK 7.0.100-rc.1.22431.12

Not specific to this configuration, it is failing on all OSes and all architectures in the dotnet-monitor PR builds when attempting to update to .NET 7 RC 1.

Other information

No response

Author:	jander-msft
Assignees:	-
Labels:	untriaged, area-Extensions-Configuration, area-Extensions-Hosting
Milestone:	-