Multi-target all component libraries to fix NuGet downgrade error #11932

Copilot · 2025-10-09T20:55:17Z

Summary

Fixes #11888 by multi-targeting all component libraries under src/Components to net8.0;net9.0.

Problem

Users encountered a NuGet downgrade error (NU1605) when using Aspire component packages in .NET 9 projects:

error NU1605: Warning As Error: Detected package downgrade: Microsoft.Extensions.Hosting.Abstractions from 9.0.9 to 8.0.1. 
Reference the package directly from the project to select a different version. 
  otel.QueueCommon -> Aspire.RabbitMQ.Client 9.5.1 -> Microsoft.Extensions.DependencyInjection.AutoActivation 9.9.0 -> Microsoft.Extensions.Hosting.Abstractions (>= 9.0.9) 
  otel.QueueCommon -> Aspire.RabbitMQ.Client 9.5.1 -> Microsoft.Extensions.Hosting.Abstractions (>= 8.0.1)

This occurred because:

Component packages targeted only net8.0, which references Microsoft.Extensions.Hosting.Abstractions 8.0.1
They depend on Microsoft.Extensions.DependencyInjection.AutoActivation 9.9.0
AutoActivation 9.9.0 requires Microsoft.Extensions.Hosting.Abstractions >= 9.0.9
This created a downgrade conflict when the packages were consumed by .NET 9 projects

Solution

Multi-targeted all component libraries to net8.0;net9.0 following the established pattern used by other Aspire components like Aspire.Microsoft.Data.SqlClient. This allows the packages to reference framework-appropriate dependency versions:

net8.0: Microsoft.Extensions.Hosting.Abstractions 8.0.1
net9.0: Microsoft.Extensions.Hosting.Abstractions 9.0.9

When consumed by a .NET 9 project, NuGet now selects the net9.0 build which has dependencies compatible with .NET 9, eliminating the downgrade warning while maintaining backward compatibility with .NET 8 projects.

Changes

Updated 27 component library projects to use <TargetFrameworks>$(AllTargetFrameworks)</TargetFrameworks>:

Aspire.Azure.Data.Tables
Aspire.Azure.Messaging.EventHubs
Aspire.Azure.Messaging.ServiceBus
Aspire.Azure.Messaging.WebPubSub
Aspire.Azure.Npgsql
Aspire.Azure.Search.Documents
Aspire.Azure.Security.KeyVault
Aspire.Azure.Storage.Blobs
Aspire.Azure.Storage.Queues
Aspire.Confluent.Kafka
Aspire.Keycloak.Authentication
Aspire.Microsoft.Azure.Cosmos
Aspire.Microsoft.Azure.StackExchangeRedis
Aspire.Microsoft.Extensions.Configuration.AzureAppConfiguration
Aspire.Milvus.Client
Aspire.MongoDB.Driver
Aspire.MongoDB.Driver.v3
Aspire.MySqlConnector
Aspire.NATS.Net
Aspire.Npgsql
Aspire.Qdrant.Client
Aspire.RabbitMQ.Client
Aspire.RabbitMQ.Client.v7
Aspire.Seq
Aspire.StackExchange.Redis
Aspire.StackExchange.Redis.DistributedCaching
Aspire.StackExchange.Redis.OutputCaching

Note: Aspire.Pomelo.EntityFrameworkCore.MySql and Aspire.Oracle.EntityFrameworkCore remain single-targeted to net8.0 because their underlying EF Core providers (Pomelo 8.x and Oracle 8.x) don't support .NET 9/EF Core 9 yet.

Added comments explaining the reason for multi-targeting to all updated projects.

Testing

✅ All 27 projects build successfully for both net8.0 and net9.0
✅ All existing tests pass for updated packages
✅ Verified NuGet packages contain correct framework-specific dependency groups
✅ Test projects using the packages restore and build without NU1605 warnings
✅ Restore completes successfully for the entire solution

Fixes #11888

Original prompt

This section details on the original issue you should resolve

<issue_title>RabbitMQ client breaks build with nuget dependency downgrade error</issue_title>
<issue_description>### Is there an existing issue for this?

I have searched the existing issues

Describe the bug

When using the RabbitMQ client with the latest Aspire 9.5.1, I can no longer build my project due to nuget dependencies...
Both nuget packages
Aspire.RabbitMQ.Client
Aspire.RabbitMQ.Client.v7
Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)
> dotnet build                             
    /Users/depechie/Projects/OpenTelemetryGrafana/code/otel.QueueCommon/otel.QueueCommon.csproj : error NU1605: 
      Warning As Error: Detected package downgrade: Microsoft.Extensions.Hosting.Abstractions from 9.0.9 to 8.0.1. Reference the package directly from the project to select a different version. 
       otel.QueueCommon -> Aspire.RabbitMQ.Client 9.5.1 -> Microsoft.Extensions.DependencyInjection.AutoActivation 9.9.0 -> Microsoft.Extensions.Hosting.Abstractions (>= 9.0.9) 
       otel.QueueCommon -> Aspire.RabbitMQ.Client 9.5.1 -> Microsoft.Extensions.Hosting.Abstractions (>= 8.0.1)
.NET Version info

Aspire version 9.5.0

Anything else?

No response</issue_description>

<agent_instructions>Please multi-target Aspire.Rabbit.Client and Aspire.RabbitMQ.Client.v7 libraries to net8.0;net9.0</agent_instructions>

Comments on the Issue (you are @copilot in this section)
@davidfowl @joperezr @eerhardt @joperezr We will likely need to have these libraries multi-target to fix this downgrade. @eerhardt Let's multi-target to fix this. I'll assign copilot

Fixes #11888

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

src/Components/Aspire.RabbitMQ.Client.v7/Aspire.RabbitMQ.Client.v7.csproj

…elo and Oracle EF Core) Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

github-actions · 2025-10-10T01:00:36Z

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 11932

Or

Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 11932"

…q-client-build-error

Remove unnecessary comments

Copilot

Pull Request Overview

This PR resolves a NuGet package downgrade error (NU1605) that occurred when consuming Aspire component packages in .NET 9 projects. The fix multi-targets all 27 component libraries under src/Components to net8.0;net9.0, enabling them to reference framework-appropriate dependency versions and eliminating conflicts with packages like Microsoft.Extensions.DependencyInjection.AutoActivation that require .NET 9 dependencies.

Key changes:

Multi-targeted 27 component libraries to support both net8.0 and net9.0
Updated corresponding test projects to multi-target for proper testing coverage
Removed outdated comments explaining multi-targeting rationale from projects already using it

Reviewed Changes

Copilot reviewed 62 out of 62 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Components/Aspire.RabbitMQ.Client/Aspire.RabbitMQ.Client.csproj	Multi-targeted to net8.0;net9.0 to fix downgrade error
src/Components/Aspire.RabbitMQ.Client.v7/Aspire.RabbitMQ.Client.v7.csproj	Multi-targeted to net8.0;net9.0 to fix downgrade error
src/Components/Aspire.StackExchange.Redis/Aspire.StackExchange.Redis.csproj	Multi-targeted to net8.0;net9.0 for consistency
src/Components/Aspire.StackExchange.Redis.OutputCaching/Aspire.StackExchange.Redis.OutputCaching.csproj	Multi-targeted to net8.0;net9.0 for consistency
src/Components/Aspire.StackExchange.Redis.DistributedCaching/Aspire.StackExchange.Redis.DistributedCaching.csproj	Multi-targeted to net8.0;net9.0 for consistency
src/Components/Aspire.OpenAI/Aspire.OpenAI.csproj	Removed outdated comment explaining multi-targeting
src/Components/Aspire.Microsoft.Data.SqlClient/Aspire.Microsoft.Data.SqlClient.csproj	Removed outdated comment explaining multi-targeting
src/Components/Aspire.Azure.AI.OpenAI/Aspire.Azure.AI.OpenAI.csproj	Removed outdated comment explaining multi-targeting
src/Components/Aspire.Azure.AI.Inference/Aspire.Azure.AI.Inference.csproj	Removed outdated comment explaining multi-targeting
src/Components/Aspire.*.csproj (23 other files)	Multi-targeted various Azure, database, and messaging component libraries to net8.0;net9.0
tests/Aspire.*.Tests.csproj (33 files)	Updated test projects to multi-target for proper testing of both framework versions

Initial plan

3153cd0

Copilot AI assigned Copilot and eerhardt Oct 9, 2025

Copilot started work on behalf of eerhardt October 9, 2025 20:55 View session

Multi-target RabbitMQ client libraries to net8.0 and net9.0

d7f2fcb

Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix RabbitMQ client build with nuget dependency downgrade error~~ Multi-target RabbitMQ client libraries to fix NuGet downgrade error Oct 9, 2025

Copilot AI requested a review from eerhardt October 9, 2025 21:10

Copilot finished work on behalf of eerhardt October 9, 2025 21:10

eerhardt reviewed Oct 9, 2025

View reviewed changes

src/Components/Aspire.RabbitMQ.Client.v7/Aspire.RabbitMQ.Client.v7.csproj Show resolved Hide resolved

Copilot started work on behalf of eerhardt October 9, 2025 21:28 View session

Multi-target all component libraries to net8.0 and net9.0 (except Pom…

147df0a

…elo and Oracle EF Core) Co-authored-by: eerhardt <8291187+eerhardt@users.noreply.github.com>

Copilot AI changed the title ~~Multi-target RabbitMQ client libraries to fix NuGet downgrade error~~ Multi-target all component libraries to fix NuGet downgrade error Oct 9, 2025

Copilot AI requested a review from eerhardt October 9, 2025 21:38

Copilot finished work on behalf of eerhardt October 9, 2025 21:38

eerhardt added 2 commits October 17, 2025 17:27

Merge remote-tracking branch 'upstream/main' into copilot/fix-rabbitm…

b2140f3

…q-client-build-error

Multi-target all client library tests

f551824

Remove unnecessary comments

eerhardt marked this pull request as ready for review October 17, 2025 23:16

eerhardt requested review from radical and sebastienros as code owners October 17, 2025 23:16

eerhardt requested review from Copilot and joperezr October 17, 2025 23:16

Copilot AI reviewed Oct 17, 2025

View reviewed changes

eerhardt approved these changes Oct 17, 2025

View reviewed changes

davidfowl approved these changes Oct 18, 2025

View reviewed changes

davidfowl merged commit 99177a6 into main Oct 18, 2025
302 checks passed

dotnet-policy-service bot added this to the 13.0 milestone Oct 18, 2025

eerhardt deleted the copilot/fix-rabbitmq-client-build-error branch October 20, 2025 14:42

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Multi-target all component libraries to fix NuGet downgrade error #11932

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Summary

Problem

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Exceptions (if any)

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