IServiceProvider.GetService throw exception “Ambiguous match found.”

[chsword]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Only .NET 7.0.1, .NET 6 and .NET 7.0.0 work well.

When I use a Collection in appsettings.json

And use builder.Services.BuildServiceProvider().CreateScope() scope.ServiceProvider.GetService to read the config I registered.

It will throw an exception: System.Reflection.AmbiguousMatchException:“Ambiguous match found.”

appsettings.json

{
 "Logging": {
 "LogLevel": {
 "Default": "Information",
 "Microsoft.AspNetCore": "Warning"
 }
 },
 "AllowedHosts": "*",
 "MyRootSetting": {
 "Key1": "aaa",
/*This "Items" will lead to errors.*/
 "Items": {
 "A1": {
 "Key1": "bbb"
 }
 }
 }
}

Setting classes

namespace WebApplication1;

public class MyRootSetting : MySettingItem
{
 public string? TopKey { get; set; }
 public MySettingItemCollection? Items { get; set; }
 public MySettingItem this[string key]
 {
 get => Items[key];
 set => Items[key] = value;
 }
}
public class MySettingItem
{
 public string? Key1 { get; set; }
}
public class MySettingItemCollection : Dictionary<string, MySettingItem>
{
 public new MySettingItem this[string key]
 {
 get
 {
 if (!base.ContainsKey(key))
 {
 base[key] = new MySettingItem();
 }
 return base[key];
 }
 set
 {
 base[key] = value;
 base[key].Key1 = key;
 }
 }
}

Program.cs

using Microsoft.Extensions.Options;
using WebApplication1;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.Configure<MyRootSetting>(builder.Configuration.GetSection("MyRootSetting"));
using (var scope = builder.Services.BuildServiceProvider().CreateScope())
{
 // this line will throw an exception
 var setting = scope.ServiceProvider.GetService<IOptions<MyRootSetting>>().Value;
 Console.WriteLine(setting.TopKey);
 Console.WriteLine(setting.Items.FirstOrDefault().Value.Key1);
}
var app = builder.Build();
app.UseAuthorization();

app.MapControllers();

app.Run();

Source Code

WebApplication1.zip

Expected Behavior

No error is reported, and Items can be read normally.
Or a more specific exception.

Steps To Reproduce

Download the source code and make sure it is released by .net 7.0.1 (2022-12-13). If run it directly, will report an error.

Exceptions (if any)

System.Reflection.AmbiguousMatchException: “Ambiguous match found.”

.NET Version

7.0.101

Anything else?

Visual Studio 2022 (v17.4.3)

Other
Docker : mcr.microsoft.com/dotnet/aspnet:7.0.1

[davidfowl]

Can you put the entire stack trace of the exception here?

[chsword]

Source:"System.Private.CoreLib"

Message:Ambiguous match found.

StackTrace:

 在 System.RuntimeType.GetPropertyImpl(String name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers)
 在 System.Type.GetProperty(String name, BindingFlags bindingAttr)
 在 Microsoft.Extensions.Configuration.ConfigurationBinder.BindConcreteDictionary(Object dictionary, Type dictionaryType, IConfiguration config, BinderOptions options)
 在 Microsoft.Extensions.Configuration.ConfigurationBinder.BindInstance(Type type, BindingPoint bindingPoint, IConfiguration config, BinderOptions options)
 在 Microsoft.Extensions.Configuration.ConfigurationBinder.BindProperty(PropertyInfo property, Object instance, IConfiguration config, BinderOptions options)
 在 Microsoft.Extensions.Configuration.ConfigurationBinder.BindProperties(Object instance, IConfiguration configuration, BinderOptions options)
 在 Microsoft.Extensions.Configuration.ConfigurationBinder.BindInstance(Type type, BindingPoint bindingPoint, IConfiguration config, BinderOptions options)
 在 Microsoft.Extensions.Options.OptionsFactory`1.Create(String name)
 在 Microsoft.Extensions.Options.UnnamedOptionsManager`1.get_Value()
 在 Program.<Main>$(String[] args) 在 E:\temp\WebApplication1\Program.cs 中: 第 9 行

[feiyun0112]

@chsword

this issue has been fixed:

#78946

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

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

Issue Details

---

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Only .NET 7.0.1, .NET 6 and .NET 7.0.0 work well.

When I use a Collection in appsettings.json

And use builder.Services.BuildServiceProvider().CreateScope() scope.ServiceProvider.GetService to read the config I registered.

It will throw an exception: System.Reflection.AmbiguousMatchException:“Ambiguous match found.”

appsettings.json

{
 "Logging": {
 "LogLevel": {
 "Default": "Information",
 "Microsoft.AspNetCore": "Warning"
 }
 },
 "AllowedHosts": "*",
 "MyRootSetting": {
 "Key1": "aaa",
/*This "Items" will lead to errors.*/
 "Items": {
 "A1": {
 "Key1": "bbb"
 }
 }
 }
}

Setting classes

namespace WebApplication1;

public class MyRootSetting : MySettingItem
{
 public string? TopKey { get; set; }
 public MySettingItemCollection? Items { get; set; }
 public MySettingItem this[string key]
 {
 get => Items[key];
 set => Items[key] = value;
 }
}
public class MySettingItem
{
 public string? Key1 { get; set; }
}
public class MySettingItemCollection : Dictionary<string, MySettingItem>
{
 public new MySettingItem this[string key]
 {
 get
 {
 if (!base.ContainsKey(key))
 {
 base[key] = new MySettingItem();
 }
 return base[key];
 }
 set
 {
 base[key] = value;
 base[key].Key1 = key;
 }
 }
}

Program.cs

using Microsoft.Extensions.Options;
using WebApplication1;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.Configure<MyRootSetting>(builder.Configuration.GetSection("MyRootSetting"));
using (var scope = builder.Services.BuildServiceProvider().CreateScope())
{
 // this line will throw an exception
 var setting = scope.ServiceProvider.GetService<IOptions<MyRootSetting>>().Value;
 Console.WriteLine(setting.TopKey);
 Console.WriteLine(setting.Items.FirstOrDefault().Value.Key1);
}
var app = builder.Build();
app.UseAuthorization();

app.MapControllers();

app.Run();

Source Code

WebApplication1.zip

Expected Behavior

No error is reported, and Items can be read normally.
Or a more specific exception.

Steps To Reproduce

Download the source code and make sure it is released by .net 7.0.1 (2022-12-13). If run it directly, will report an error.

Exceptions (if any)

System.Reflection.AmbiguousMatchException: “Ambiguous match found.”

.NET Version

7.0.101

Anything else?

Visual Studio 2022 (v17.4.3)

Other
Docker : mcr.microsoft.com/dotnet/aspnet:7.0.1

Author:	chsword
Assignees:	-
Labels:	untriaged, area-Extensions-Configuration
Milestone:	-

[chsword]

@chsword

this issue has been fixed:

#78946

好地，收到

[tarekgh]

@chsword closing the issue. The fix is ported to .NET 7.0 servicing tree and will be released in the next servicing cycle release.