Fix for #1568 when RaiseAsync with a void Delegate returns null results in System.NullReferenceException

.editorconfig

@@ -30,6 +30,8 @@ indent_size = 2
 
 # Dotnet code style settings:
 [*.{cs,vb}]
+tab_width = 4
+
 # Sort using and Import directives with System.* appearing first
 dotnet_sort_system_directives_first = true
 # Avoid "this." and "Me." if not necessary
@@ -57,6 +59,9 @@ dotnet_style_require_accessibility_modifiers = omit_if_default:error
 # IDE0040: Add accessibility modifiers
 dotnet_diagnostic.IDE0040.severity = error
 
+# IDE1100: Error reading content of source file 'Project.TargetFrameworkMoniker' (i.e. from ThisAssembly)
+dotnet_diagnostic.IDE1100.severity = none
+
 [*.cs]
 # Top-level files are definitely OK
 csharp_using_directive_placement = outside_namespace:silent

.github/copilot-instructions.md

@@ -0,0 +1,94 @@
+# .NET Repository
+
+**Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.**
+
+## Working Effectively
+
+### Essential Build Commands
+- **Restore dependencies**: `dotnet restore`
+
+- **Build the entire solution**: `dotnet build`
+
+- **Run tests**: `dnx --yes retest`
+  - Runs all unit tests across the solution
+  - If tests fail due to Azure Storage, run the following commands and retry: `npm install azurite` and `npx azurite &`
+
+### Build Validation and CI Requirements
+- **Always run before committing**: 
+  * `dnx --yes retest`
+  * `dotnet format whitespace -v:diag --exclude ~/.nuget`
+  * `dotnet format style -v:diag --exclude ~/.nuget`
+
+### Project Structure and Navigation
+
+| Directory | Description |
+|-----------|-------------|
+| `src/` | Contains the repo source code. |
+| `bin/` | Contains built packages (if any) |
+
+### Code Style and Formatting
+
+#### EditorConfig Rules
+The repository uses `.editorconfig` at the repo root for consistent code style.
+
+- **Indentation**: 4 spaces for C# files, 2 spaces for XML/YAML/JSON
+- **Line endings**: LF (Unix-style)
+- **Sort using directives**: System.* namespaces first (`dotnet_sort_system_directives_first = true`)
+- **Type references**: Prefer language keywords over framework type names (`int` vs `Int32`)
+- **Modern C# features**: Use object/collection initializers, coalesce expressions when possible, use var when the type is apparent from the right-hand side of the assignment
+- **Visibility modifiers**: only explicitly specify visibility when different from the default (e.g. `public` for classes, no `internal` for classes or `private` for fields, etc.)
+
+#### Formatting Validation
+- CI enforces formatting with `dotnet format whitespace` and `dotnet format style`
+- Run locally: `dotnet format whitespace --verify-no-changes -v:diag --exclude ~/.nuget`
+- Fix formatting: `dotnet format` (without `--verify-no-changes`)
+
+### Testing Practices
+
+#### Test Framework
+- **xUnit** for all unit and integration tests
+- **Moq** for mocking dependencies
+- Located in `src/*.Tests/`
+
+#### Test Attributes
+Custom xUnit attributes are sometimes used for conditional test execution:
+- `[SecretsFact("XAI_API_KEY")]` - Skips test if required secrets are missing from user secrets or environment variables
+- `[LocalFact("SECRET")]` - Runs only locally (skips in CI), requires specified secrets
+- `[CIFact]` - Runs only in CI environment
+
+### Dependency Management
+
+#### Adding Dependencies
+- Add to appropriate `.csproj` file
+- Run `dotnet restore` to update dependencies
+- Ensure version consistency across projects where applicable
+
+#### CI/CD Pipeline
+- **Build workflow**: `.github/workflows/build.yml` - runs on PR and push to main/rel/feature branches
+- **Publish workflow**: Publishes to Sleet feed when `SLEET_CONNECTION` secret is available
+- **OS matrix**: Configured in `.github/workflows/os-matrix.json` (defaults to ubuntu-latest)
+
+### Special Files and Tools
+
+#### dnx Command
+- **Purpose**: built-in tool for running arbitrary dotnet tools that are published on nuget.org. `--yes` auto-confirms install before run.
+- **Example**: `dnx --yes retest` - runs tests with automatic retry on transient failures (retest being a tool package published at https://www.nuget.org/packages/retest)
+- **In CI**: `dnx --yes retest -- --no-build` (skips build, runs tests only)
+
+#### Directory.Build.rsp
+- MSBuild response file with default build arguments
+- `-nr:false` - disables node reuse
+- `-m:1` - single-threaded build (for stability)
+- `-v:m` - minimal verbosity
+
+#### Code Quality
+- All PRs must pass format validation
+- Tests must pass on all target frameworks
+- Follow existing patterns and conventions in the codebase
+
+## Documenting Work
+
+Project implemention details, design and key decisions should be documented in a top-level AGENTS.md file at the repo root. 
+Keep this file updated whenever you make change significant changes for future reference.
+
+User-facing features and APIs should be documented to highlight (not extensively, as an overview) key project features and capabilities, in the readme.md file at the repo root.

.github/dependabot.yml

@@ -24,9 +24,17 @@ updates:
     Extensions:
       patterns:
         - "Microsoft.Extensions*"
+      exclude-patterns:
+        - "Microsoft.Extensions.AI*"
+    ExtensionsAI:
+      patterns:
+        - "Microsoft.Extensions.AI*"
     Web:
       patterns:
         - "Microsoft.AspNetCore*"
+    OpenTelemetry:
+      patterns:
+        - "OpenTelemetry*"
     Tests:
       patterns:
         - "Microsoft.NET.Test*"

.github/dotnet.json

@@ -0,0 +1,4 @@
+[
+  "6.x",
+  "8.x"
+]

.github/workflows/build.yml

@@ -12,7 +12,7 @@ on:
         - Release
         - Debug
   push:
-    branches: [ main, dev, 'dev/*', 'feature/*', 'rel/*' ]
+    branches: [ main, 'feature/*', 'rel/*' ]
     paths-ignore:
       - changelog.md
       - readme.md
@@ -66,15 +66,14 @@ jobs:
           fetch-depth: 0
 
       - name: ⚙ dotnet
-        uses: ./.github/actions/dotnet
+        uses: devlooped/actions-dotnet-env@v1
 
       - name: 🙏 build
         run: dotnet build -m:1 -bl:build.binlog
 
       - name: 🧪 test
-        run: |
-          dotnet tool update -g dotnet-retest
-          dotnet retest -- --no-build
+        shell: pwsh
+        run: dnx --yes retest -- --no-build
 
       - name: 🐛 logs
         uses: actions/upload-artifact@v4
@@ -101,12 +100,7 @@ jobs:
           fetch-depth: 0
 
       - name: ⚙ dotnet
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: |
-            6.x
-            8.x
-            9.x
+        uses: devlooped/actions-dotnet-env@v1
 
       - name: ✓ ensure format
         run: |

.github/workflows/dotnet-env.yml

@@ -0,0 +1,52 @@
+name: dotnet-env
+on:
+  workflow_dispatch:
+  push:
+    branches: 
+      - main
+    paths:
+      - '**/*.*proj'
+
+jobs:
+  which-dotnet:
+    runs-on: ubuntu-latest 
+    env:
+      PR_TOKEN: ${{ secrets.DEVLOOPED_TOKEN || secrets.GH_TOKEN }}
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: 🤖 defaults
+        uses: devlooped/actions-bot@v1
+        with:
+          name: ${{ secrets.BOT_NAME }}
+          email: ${{ secrets.BOT_EMAIL }}
+          gh_token: ${{ env.PR_TOKEN }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: 🤘 checkout
+        uses: actions/checkout@v4
+        with: 
+          token: ${{ env.PR_TOKEN || github.token }}
+
+      - name: 🤌 dotnet
+        uses: devlooped/actions-which-dotnet@v1
+
+      - name: ✍ pull request
+        if: env.PR_TOKEN != ''
+        uses: peter-evans/create-pull-request@v7
+        with:
+          base: main
+          branch: which-dotnet
+          delete-branch: true
+          labels: dependencies
+          title: "⚙ Update dotnet versions"
+          body: "Update dotnet versions"
+          commit-message: "Update dotnet versions"
+          token: ${{ env.PR_TOKEN }}
+
+      - name: ⚠️ skip pull request
+        if: env.PR_TOKEN == ''
+        shell: bash
+        run: echo "::warning::Skipping PR creation because neither DEVLOOPED_TOKEN nor GH_TOKEN is configured. GITHUB_TOKEN cannot create pull requests in this repository."

.github/workflows/includes.yml

@@ -5,12 +5,15 @@ on:
     branches:
       - 'main'
     paths:
-      - '**.md'    
+      - '**.md'
       - '!changelog.md'
+      - 'osmfeula.txt'
 
 jobs:
   includes:
     runs-on: ubuntu-latest
+    env:
+      PR_TOKEN: ${{ secrets.DEVLOOPED_TOKEN || secrets.GH_TOKEN }}
     permissions:
       contents: write
       pull-requests: write
@@ -20,28 +23,53 @@ jobs:
         with:
           name: ${{ secrets.BOT_NAME }}
           email: ${{ secrets.BOT_EMAIL }}
-          gh_token: ${{ secrets.GH_TOKEN }}
+          gh_token: ${{ env.PR_TOKEN }}
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: 🤘 checkout
         uses: actions/checkout@v4
         with: 
-          token: ${{ env.GH_TOKEN }}
+          token: ${{ env.PR_TOKEN || github.token }}
 
       - name: +Mᐁ includes
         uses: devlooped/actions-includes@v1
 
+      - name: 📝 OSMF EULA
+        shell: pwsh
+        run: |
+          $file = "osmfeula.txt"
+          $props = "src/Directory.Build.props"
+          if (-not (test-path $file) -or -not (test-path $props)) {
+            exit 0
+          }
+
+          $product = dotnet msbuild $props -getproperty:Product
+          if (-not $product) { 
+            write-error 'To use OSMF EULA, ensure the $(Product) property is set in Directory.props'
+            exit 1
+          }
+
+          ((get-content -raw $file) -replace '\$product\$',$product).trim() | set-content $file
+
       - name: ✍ pull request
-        uses: peter-evans/create-pull-request@v6
+        if: env.PR_TOKEN != ''
+        uses: peter-evans/create-pull-request@v8
         with:
-          add-paths: '**.md'
+          add-paths: |
+            **.md
+            *.txt
           base: main
           branch: markdown-includes
           delete-branch: true
-          labels: docs
+          labels: dependencies
           author: ${{ env.BOT_AUTHOR }}
           committer: ${{ env.BOT_AUTHOR }}
           commit-message: +Mᐁ includes
           title: +Mᐁ includes
           body: +Mᐁ includes
-          token: ${{ env.GH_TOKEN }}
+          token: ${{ env.PR_TOKEN }}
+
+      - name: ⚠️ skip pull request
+        if: env.PR_TOKEN == ''
+        shell: bash
+        run: echo "::warning::Skipping PR creation because neither DEVLOOPED_TOKEN nor GH_TOKEN is configured. GITHUB_TOKEN cannot create pull requests in this repository."

.github/workflows/publish.yml

@@ -28,15 +28,14 @@ jobs:
           fetch-depth: 0
 
       - name: ⚙ dotnet
-        uses: ./.github/actions/dotnet
+        uses: devlooped/actions-dotnet-env@v1
 
       - name: 🙏 build
         run: dotnet build -m:1 -bl:build.binlog
 
       - name: 🧪 test
-        run: |
-          dotnet tool update -g dotnet-retest
-          dotnet retest -- --no-build
+        shell: pwsh
+        run: dnx --yes retest -- --no-build
 
       - name: 🐛 logs
         uses: actions/upload-artifact@v4

.github/workflows/triage.yml

@@ -49,7 +49,11 @@ jobs:
           # if we don't have at least 100 requests left, wait until reset
           if ($rate.remaining -lt 100) {
               $wait = ($rate.reset - (Get-Date (Get-Date).ToUniversalTime() -UFormat %s))
-              echo "Rate limit remaining is $($rate.remaining), waiting for $($wait / 1000) seconds to reset"
+              if ($wait -gt 300) {
+                  echo "Rate limit remaining is $($rate.remaining), reset in $wait seconds (more than 5'). Aborting."
+                  exit 1
+              }
+              echo "Rate limit remaining is $($rate.remaining), waiting $wait seconds to reset"
               sleep $wait
               $rate = gh api rate_limit | convertfrom-json | select -expandproperty rate
               echo "Rate limit has reset to $($rate.remaining) requests"

.gitignore

@@ -1,16 +1,24 @@
 bin
 obj
+out
 artifacts
 pack
+agent-tools
+terminals
 TestResults
 results
 BenchmarkDotNet.Artifacts
+mcps
 /app
+/temp
 .vs
 .vscode
 .genaiscript
 .idea
 local.settings.json
+.env
+.next
+*.local
 
 *.suo
 *.sdf
@@ -24,6 +32,7 @@ local.settings.json
 *.binlog
 *.zip
 __azurite*.*
+AzuriteConfig
 __*__
 
 .nuget