diff --git a/.github/workflows/__all-platform-bundle.yml b/.github/workflows/__all-platform-bundle.yml
index 89138c523c..e2b5e69fc4 100644
--- a/.github/workflows/__all-platform-bundle.yml
+++ b/.github/workflows/__all-platform-bundle.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -74,6 +84,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - id: init
         uses: ./../action/init
         with:
diff --git a/.github/workflows/__analyze-ref-input.yml b/.github/workflows/__analyze-ref-input.yml
index 9cf85b0c59..9efe4a8c32 100644
--- a/.github/workflows/__analyze-ref-input.yml
+++ b/.github/workflows/__analyze-ref-input.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -85,6 +95,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           tools: ${{ steps.prepare-test.outputs.tools-url }}
diff --git a/.github/workflows/__autobuild-action.yml b/.github/workflows/__autobuild-action.yml
index c315763391..0e617afe1c 100644
--- a/.github/workflows/__autobuild-action.yml
+++ b/.github/workflows/__autobuild-action.yml
@@ -21,9 +21,19 @@ on:
   schedule:
     - cron: '0 5 * * *'
   workflow_dispatch:
-    inputs: {}
+    inputs:
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
-    inputs: {}
+    inputs:
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -59,6 +69,10 @@ jobs:
           version: ${{ matrix.version }}
           use-all-platform-bundle: 'false'
           setup-kotlin: 'true'
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           languages: csharp
diff --git a/.github/workflows/__build-mode-manual.yml b/.github/workflows/__build-mode-manual.yml
index e0dc25f889..4be0c42d15 100644
--- a/.github/workflows/__build-mode-manual.yml
+++ b/.github/workflows/__build-mode-manual.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -70,6 +80,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         id: init
         with:
diff --git a/.github/workflows/__export-file-baseline-information.yml b/.github/workflows/__export-file-baseline-information.yml
index 66274f26b6..980535c84d 100644
--- a/.github/workflows/__export-file-baseline-information.yml
+++ b/.github/workflows/__export-file-baseline-information.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -74,6 +84,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         id: init
         with:
diff --git a/.github/workflows/__go-custom-queries.yml b/.github/workflows/__go-custom-queries.yml
index 1b5b7b9150..fe35b5b4d8 100644
--- a/.github/workflows/__go-custom-queries.yml
+++ b/.github/workflows/__go-custom-queries.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -72,6 +82,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           languages: go
diff --git a/.github/workflows/__go.yml b/.github/workflows/__go.yml
index e8bf8837e4..fb27da710a 100644
--- a/.github/workflows/__go.yml
+++ b/.github/workflows/__go.yml
@@ -18,6 +18,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 jobs:
   go-custom-queries:
     name: 'Go: Custom queries'
@@ -27,6 +32,7 @@ jobs:
     uses: ./.github/workflows/__go-custom-queries.yml
     with:
       go-version: ${{ inputs.go-version }}
+      dotnet-version: ${{ inputs.dotnet-version }}
   go-indirect-tracing-workaround-diagnostic:
     name: 'Go: diagnostic when Go is changed after init step'
     permissions:
diff --git a/.github/workflows/__local-bundle.yml b/.github/workflows/__local-bundle.yml
index 159d8c4556..3fc89f381a 100644
--- a/.github/workflows/__local-bundle.yml
+++ b/.github/workflows/__local-bundle.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -85,6 +95,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - name: Fetch latest CodeQL bundle
         run: |
           wget https://github.com/github/codeql-action/releases/latest/download/codeql-bundle-linux64.tar.zst
diff --git a/.github/workflows/__multi-language-autodetect.yml b/.github/workflows/__multi-language-autodetect.yml
index e9272f8939..3704cdbf51 100644
--- a/.github/workflows/__multi-language-autodetect.yml
+++ b/.github/workflows/__multi-language-autodetect.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -119,6 +129,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - name: Use Xcode 16
         if: runner.os == 'macOS' && matrix.version != 'nightly-latest'
         run: sudo xcode-select -s "/Applications/Xcode_16.app"
diff --git a/.github/workflows/__packaging-codescanning-config-inputs-js.yml b/.github/workflows/__packaging-codescanning-config-inputs-js.yml
index a5038cefc4..53f280ab96 100644
--- a/.github/workflows/__packaging-codescanning-config-inputs-js.yml
+++ b/.github/workflows/__packaging-codescanning-config-inputs-js.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -96,6 +106,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           config-file: .github/codeql/codeql-config-packaging3.yml
diff --git a/.github/workflows/__packaging-config-inputs-js.yml b/.github/workflows/__packaging-config-inputs-js.yml
index 9c8483c746..2b483b41a3 100644
--- a/.github/workflows/__packaging-config-inputs-js.yml
+++ b/.github/workflows/__packaging-config-inputs-js.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -81,6 +91,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           config-file: .github/codeql/codeql-config-packaging3.yml
diff --git a/.github/workflows/__packaging-config-js.yml b/.github/workflows/__packaging-config-js.yml
index b7608793a5..d45ca3b369 100644
--- a/.github/workflows/__packaging-config-js.yml
+++ b/.github/workflows/__packaging-config-js.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -81,6 +91,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           config-file: .github/codeql/codeql-config-packaging.yml
diff --git a/.github/workflows/__packaging-inputs-js.yml b/.github/workflows/__packaging-inputs-js.yml
index 0a814a0502..41ca571b8c 100644
--- a/.github/workflows/__packaging-inputs-js.yml
+++ b/.github/workflows/__packaging-inputs-js.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -81,6 +91,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           config-file: .github/codeql/codeql-config-packaging2.yml
diff --git a/.github/workflows/__remote-config.yml b/.github/workflows/__remote-config.yml
index b59da417e4..20a308e748 100644
--- a/.github/workflows/__remote-config.yml
+++ b/.github/workflows/__remote-config.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -87,6 +97,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           tools: ${{ steps.prepare-test.outputs.tools-url }}
diff --git a/.github/workflows/__split-workflow.yml b/.github/workflows/__split-workflow.yml
index e916b36ccc..3ffb099286 100644
--- a/.github/workflows/__split-workflow.yml
+++ b/.github/workflows/__split-workflow.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -80,6 +90,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           config-file: .github/codeql/codeql-config-packaging3.yml
diff --git a/.github/workflows/__swift-custom-build.yml b/.github/workflows/__swift-custom-build.yml
index 32ce33a7f0..a1c5a556ff 100644
--- a/.github/workflows/__swift-custom-build.yml
+++ b/.github/workflows/__swift-custom-build.yml
@@ -27,6 +27,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -34,6 +39,11 @@ on:
         description: The version of Go to install
         required: false
         default: '>=1.21.0'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -74,6 +84,10 @@ jobs:
         with:
           go-version: ${{ inputs.go-version || '>=1.21.0' }}
           cache: false
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - name: Use Xcode 16
         if: runner.os == 'macOS' && matrix.version != 'nightly-latest'
         run: sudo xcode-select -s "/Applications/Xcode_16.app"
diff --git a/.github/workflows/__unset-environment.yml b/.github/workflows/__unset-environment.yml
index ced3b33fcc..c1a62b1108 100644
--- a/.github/workflows/__unset-environment.yml
+++ b/.github/workflows/__unset-environment.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -87,6 +97,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         id: init
         with:
diff --git a/.github/workflows/__upload-ref-sha-input.yml b/.github/workflows/__upload-ref-sha-input.yml
index 8f1fd49173..1c2c5975d1 100644
--- a/.github/workflows/__upload-ref-sha-input.yml
+++ b/.github/workflows/__upload-ref-sha-input.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -85,6 +95,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           tools: ${{ steps.prepare-test.outputs.tools-url }}
diff --git a/.github/workflows/__upload-sarif.yml b/.github/workflows/__upload-sarif.yml
index 77cd057f9c..361c8228fc 100644
--- a/.github/workflows/__upload-sarif.yml
+++ b/.github/workflows/__upload-sarif.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -92,6 +102,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - uses: ./../action/init
         with:
           tools: ${{ steps.prepare-test.outputs.tools-url }}
diff --git a/.github/workflows/__with-checkout-path.yml b/.github/workflows/__with-checkout-path.yml
index 1b4002ffbc..5aa2b631c2 100644
--- a/.github/workflows/__with-checkout-path.yml
+++ b/.github/workflows/__with-checkout-path.yml
@@ -32,6 +32,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
   workflow_call:
     inputs:
       go-version:
@@ -44,6 +49,11 @@ on:
         description: The version of Python to install
         required: false
         default: '3.13'
+      dotnet-version:
+        type: string
+        description: The version of .NET to install
+        required: false
+        default: 9.x
 defaults:
   run:
     shell: bash
@@ -85,6 +95,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ inputs.python-version || '3.13' }}
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version || '9.x' }}
       - name: Delete original checkout
         run: |
           # delete the original checkout so we don't accidentally use it.
diff --git a/.github/workflows/debug-artifacts-failure-safe.yml b/.github/workflows/debug-artifacts-failure-safe.yml
index 1a09b3d9ee..768f88f965 100644
--- a/.github/workflows/debug-artifacts-failure-safe.yml
+++ b/.github/workflows/debug-artifacts-failure-safe.yml
@@ -54,6 +54,10 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: ^1.13.1
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '9.x'
       - uses: ./../action/init
         with:
           tools: ${{ steps.prepare-test.outputs.tools-url }}
diff --git a/.github/workflows/debug-artifacts-safe.yml b/.github/workflows/debug-artifacts-safe.yml
index ea513521f1..e33d70cc3a 100644
--- a/.github/workflows/debug-artifacts-safe.yml
+++ b/.github/workflows/debug-artifacts-safe.yml
@@ -50,6 +50,10 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: ^1.13.1
+      - name: Install .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '9.x'
       - uses: ./../action/init
         id: init
         with:
diff --git a/.github/workflows/test-codeql-bundle-all.yml b/.github/workflows/test-codeql-bundle-all.yml
index 4b7fdca817..6465d6a1d8 100644
--- a/.github/workflows/test-codeql-bundle-all.yml
+++ b/.github/workflows/test-codeql-bundle-all.yml
@@ -43,6 +43,10 @@ jobs:
       with:
         version: ${{ matrix.version }}
         use-all-platform-bundle: true
+    - name: Install .NET
+      uses: actions/setup-dotnet@v5
+      with:
+        dotnet-version: '9.x'
     - id: init
       uses: ./../action/init
       with:
diff --git a/pr-checks/checks/all-platform-bundle.yml b/pr-checks/checks/all-platform-bundle.yml
index 3396be22a7..994c91eb97 100644
--- a/pr-checks/checks/all-platform-bundle.yml
+++ b/pr-checks/checks/all-platform-bundle.yml
@@ -4,6 +4,7 @@ operatingSystems: ["ubuntu", "macos", "windows"]
 versions: ["nightly-latest"]
 useAllPlatformBundle: "true"
 installGo: true
+installDotNet: true
 steps:
   - id: init
     uses: ./../action/init
diff --git a/pr-checks/checks/analyze-ref-input.yml b/pr-checks/checks/analyze-ref-input.yml
index 1dbf9e0c86..e9d2cd1764 100644
--- a/pr-checks/checks/analyze-ref-input.yml
+++ b/pr-checks/checks/analyze-ref-input.yml
@@ -3,6 +3,7 @@ description: "Checks that specifying 'ref' and 'sha' as inputs works"
 versions: ["default"]
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/autobuild-action.yml b/pr-checks/checks/autobuild-action.yml
index 91ae7834cc..b91489cc8c 100644
--- a/pr-checks/checks/autobuild-action.yml
+++ b/pr-checks/checks/autobuild-action.yml
@@ -2,6 +2,7 @@ name: "autobuild-action"
 description: "Tests that the C# autobuild action works"
 operatingSystems: ["ubuntu", "macos", "windows"]
 versions: ["linked"]
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/build-mode-manual.yml b/pr-checks/checks/build-mode-manual.yml
index f1815b7ff0..a8048230c8 100644
--- a/pr-checks/checks/build-mode-manual.yml
+++ b/pr-checks/checks/build-mode-manual.yml
@@ -2,6 +2,7 @@ name: "Build mode manual"
 description: "An end-to-end integration test of a Java repository built using 'build-mode: manual'"
 versions: ["nightly-latest"]
 installGo: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     id: init
diff --git a/pr-checks/checks/export-file-baseline-information.yml b/pr-checks/checks/export-file-baseline-information.yml
index 1a316d6ec0..5ff186e9f6 100644
--- a/pr-checks/checks/export-file-baseline-information.yml
+++ b/pr-checks/checks/export-file-baseline-information.yml
@@ -3,6 +3,7 @@ description: "Tests that file baseline information is exported when the feature
 operatingSystems: ["ubuntu", "macos", "windows"]
 versions: ["nightly-latest"]
 installGo: true
+installDotNet: true
 env:
   CODEQL_ACTION_SUBLANGUAGE_FILE_COVERAGE: true
 steps:
diff --git a/pr-checks/checks/go-custom-queries.yml b/pr-checks/checks/go-custom-queries.yml
index ca00fd81a9..867d8dc6cc 100644
--- a/pr-checks/checks/go-custom-queries.yml
+++ b/pr-checks/checks/go-custom-queries.yml
@@ -7,6 +7,7 @@ versions:
   - linked
   - nightly-latest
 installGo: true
+installDotNet: true
 env:
   DOTNET_GENERATE_ASPNET_CERTIFICATE: "false"
 steps:
diff --git a/pr-checks/checks/local-bundle.yml b/pr-checks/checks/local-bundle.yml
index 449dcbbb17..c0930772e6 100644
--- a/pr-checks/checks/local-bundle.yml
+++ b/pr-checks/checks/local-bundle.yml
@@ -3,6 +3,7 @@ description: "Tests using a CodeQL bundle from a local file rather than a URL"
 versions: ["linked"]
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - name: Fetch latest CodeQL bundle
     run: |
diff --git a/pr-checks/checks/multi-language-autodetect.yml b/pr-checks/checks/multi-language-autodetect.yml
index 84c779dd9a..4892bcc316 100644
--- a/pr-checks/checks/multi-language-autodetect.yml
+++ b/pr-checks/checks/multi-language-autodetect.yml
@@ -5,6 +5,7 @@ env:
   CODEQL_ACTION_RESOLVE_SUPPORTED_LANGUAGES_USING_CLI: true
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - name: Use Xcode 16
     if: runner.os == 'macOS' && matrix.version != 'nightly-latest'
diff --git a/pr-checks/checks/packaging-codescanning-config-inputs-js.yml b/pr-checks/checks/packaging-codescanning-config-inputs-js.yml
index 1b72b06b3f..6fd0f7c8a1 100644
--- a/pr-checks/checks/packaging-codescanning-config-inputs-js.yml
+++ b/pr-checks/checks/packaging-codescanning-config-inputs-js.yml
@@ -4,6 +4,7 @@ versions: ["linked", "default", "nightly-latest"] # This feature is not compatib
 installGo: true
 installNode: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/packaging-config-inputs-js.yml b/pr-checks/checks/packaging-config-inputs-js.yml
index 41275fd15c..8df42f9443 100644
--- a/pr-checks/checks/packaging-config-inputs-js.yml
+++ b/pr-checks/checks/packaging-config-inputs-js.yml
@@ -3,6 +3,7 @@ description: "Checks that specifying packages using a combination of a config fi
 versions: ["linked", "default", "nightly-latest"] # This feature is not compatible with old CLIs
 installGo: true
 installNode: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/packaging-config-js.yml b/pr-checks/checks/packaging-config-js.yml
index 906a3a7d93..9fa41061ce 100644
--- a/pr-checks/checks/packaging-config-js.yml
+++ b/pr-checks/checks/packaging-config-js.yml
@@ -3,6 +3,7 @@ description: "Checks that specifying packages using only a config file works"
 versions: ["linked", "default", "nightly-latest"] # This feature is not compatible with old CLIs
 installGo: true
 installNode: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/packaging-inputs-js.yml b/pr-checks/checks/packaging-inputs-js.yml
index 9d9fbe71f8..bb70de7e61 100644
--- a/pr-checks/checks/packaging-inputs-js.yml
+++ b/pr-checks/checks/packaging-inputs-js.yml
@@ -3,6 +3,7 @@ description: "Checks that specifying packages using the input to the Action work
 versions: ["linked", "default", "nightly-latest"] # This feature is not compatible with old CLIs
 installGo: true
 installNode: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/remote-config.yml b/pr-checks/checks/remote-config.yml
index c0a9cf0bb2..24249156ea 100644
--- a/pr-checks/checks/remote-config.yml
+++ b/pr-checks/checks/remote-config.yml
@@ -7,6 +7,7 @@ versions:
   - nightly-latest
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/split-workflow.yml b/pr-checks/checks/split-workflow.yml
index fdcf1d5304..23f82a7a5b 100644
--- a/pr-checks/checks/split-workflow.yml
+++ b/pr-checks/checks/split-workflow.yml
@@ -3,6 +3,7 @@ description: "Tests a split-up workflow in which we first build a database and l
 operatingSystems: ["ubuntu", "macos"]
 versions: ["linked", "default", "nightly-latest"] # This feature is not compatible with old CLIs
 installGo: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/swift-custom-build.yml b/pr-checks/checks/swift-custom-build.yml
index 2ad44ff3b9..1c8f1bf3af 100644
--- a/pr-checks/checks/swift-custom-build.yml
+++ b/pr-checks/checks/swift-custom-build.yml
@@ -3,6 +3,7 @@ description: "Tests creation of a Swift database using custom build"
 versions: ["linked", "default", "nightly-latest"]
 operatingSystems: ["macos"]
 installGo: true
+installDotNet: true
 env:
   DOTNET_GENERATE_ASPNET_CERTIFICATE: "false"
 steps:
diff --git a/pr-checks/checks/unset-environment.yml b/pr-checks/checks/unset-environment.yml
index 614c2006ef..4cc728600a 100644
--- a/pr-checks/checks/unset-environment.yml
+++ b/pr-checks/checks/unset-environment.yml
@@ -7,6 +7,7 @@ versions:
   - nightly-latest
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     id: init
diff --git a/pr-checks/checks/upload-ref-sha-input.yml b/pr-checks/checks/upload-ref-sha-input.yml
index fe55b5457b..0c8059a515 100644
--- a/pr-checks/checks/upload-ref-sha-input.yml
+++ b/pr-checks/checks/upload-ref-sha-input.yml
@@ -3,6 +3,7 @@ description: "Checks that specifying 'ref' and 'sha' as inputs works"
 versions: ["default"]
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/upload-sarif.yml b/pr-checks/checks/upload-sarif.yml
index 0028e67ed2..cfe66a3f87 100644
--- a/pr-checks/checks/upload-sarif.yml
+++ b/pr-checks/checks/upload-sarif.yml
@@ -4,6 +4,7 @@ versions: ["default"]
 analysisKinds: ["code-scanning", "code-quality", "code-scanning,code-quality"]
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   - uses: ./../action/init
     with:
diff --git a/pr-checks/checks/with-checkout-path.yml b/pr-checks/checks/with-checkout-path.yml
index b18d191ccd..5cdd02c0d0 100644
--- a/pr-checks/checks/with-checkout-path.yml
+++ b/pr-checks/checks/with-checkout-path.yml
@@ -3,6 +3,7 @@ description: "Checks that a custom `checkout_path` will find the proper commit_o
 versions: ["linked"]
 installGo: true
 installPython: true
+installDotNet: true
 steps:
   # This ensures we don't accidentally use the original checkout for any part of the test.
   - name: Delete original checkout
diff --git a/pr-checks/sync.py b/pr-checks/sync.py
index f247f38245..77816be760 100755
--- a/pr-checks/sync.py
+++ b/pr-checks/sync.py
@@ -204,6 +204,25 @@ def writeHeader(checkStream):
             }
         })
 
+    installDotNet = is_truthy(checkSpecification.get('installDotNet', ''))
+
+    if installDotNet:
+        baseDotNetVersionExpr = '9.x'
+        workflowInputs['dotnet-version'] = {
+            'type': 'string',
+            'description': 'The version of .NET to install',
+            'required': False,
+            'default': baseDotNetVersionExpr,
+        }
+
+        steps.append({
+            'name': 'Install .NET',
+            'uses': 'actions/setup-dotnet@v5',
+            'with': {
+                'dotnet-version': '${{ inputs.dotnet-version || \'' + baseDotNetVersionExpr + '\' }}'
+            }
+        })
+
     # If container initialisation steps are present in the check specification,
     # make sure to execute them first.
     if 'container' in checkSpecification and 'container-init-steps' in checkSpecification:
diff --git a/tests/multi-language-repo/global.json b/tests/multi-language-repo/global.json
new file mode 100644
index 0000000000..764fdd82be
--- /dev/null
+++ b/tests/multi-language-repo/global.json
@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "9.0.307",
+    "rollForward": "latestFeature"
+  }
+}