From 81b7ad83b43d32b4f8524b6e20bf807fba219b62 Mon Sep 17 00:00:00 2001
From: Van Nguyen <nguyenthanhvan1902@gmail.com>
Date: Wed, 21 Oct 2026 21:38:48 +0700
Subject: [PATCH] feat(dotnet): test on the .NET 10 SDK by default

.NET 8 and .NET 9 both reach end of support on 10 November 2026, and .NET 10 is
the current LTS. The dotnet stack and the stack-dotnet workflow now default to
["10.0"] instead of ["8.0","9.0"]; the GitLab job falls back to the 10.0 image.

Existing ci.yml files keep the list they were written with until the next
`repokeeper update`. A project that still targets net8.0 or net9.0 should move
to net10.0 or set `stack_options.dotnet.versions`.
---
 .github/workflows/stack-dotnet.yml   | 2 +-
 .github/workflows/workflow-tests.yml | 2 +-
 fixtures/dotnet/Fixture.Tests.csproj | 2 +-
 src/platforms/gitlab-jobs.ts         | 2 +-
 src/stacks/dotnet.ts                 | 2 +-
 test/platforms-gitlab-stacks.test.ts | 3 +++
 test/stacks-dotnet.test.ts           | 2 +-
 7 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/stack-dotnet.yml b/.github/workflows/stack-dotnet.yml
index 57ff4ae..d0a2f72 100644
--- a/.github/workflows/stack-dotnet.yml
+++ b/.github/workflows/stack-dotnet.yml
@@ -6,7 +6,7 @@ on:
       dotnet-versions:
         description: JSON list of .NET SDK versions, all installed side by side
         type: string
-        default: '["8.0","9.0"]'
+        default: '["10.0"]'
       os:
         description: JSON list of runner labels
         type: string
diff --git a/.github/workflows/workflow-tests.yml b/.github/workflows/workflow-tests.yml
index ca925e7..a591c60 100644
--- a/.github/workflows/workflow-tests.yml
+++ b/.github/workflows/workflow-tests.yml
@@ -155,7 +155,7 @@ jobs:
     with:
       working-directory: fixtures/dotnet
       os: ${{ github.event_name == 'push' && '["ubuntu-latest","windows-latest"]' || '["ubuntu-latest"]' }}
-      dotnet-versions: '["8.0","9.0"]'
+      dotnet-versions: '["10.0"]'
       commands: '["dotnet restore","dotnet format --verify-no-changes --no-restore","dotnet build --no-restore","dotnet test --no-build"]'
   go:
     needs: changes
diff --git a/fixtures/dotnet/Fixture.Tests.csproj b/fixtures/dotnet/Fixture.Tests.csproj
index 5273390..4041350 100644
--- a/fixtures/dotnet/Fixture.Tests.csproj
+++ b/fixtures/dotnet/Fixture.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <IsPackable>false</IsPackable>
diff --git a/src/platforms/gitlab-jobs.ts b/src/platforms/gitlab-jobs.ts
index 41a0714..edc0225 100644
--- a/src/platforms/gitlab-jobs.ts
+++ b/src/platforms/gitlab-jobs.ts
@@ -178,7 +178,7 @@ export function stackJobs(stack: ResolvedStack): Array<{ key: string; job: Job }
     return [{ key: stack.id, job: perVersion(image, "JAVA_VERSION", list(input, "java-versions"), commands) }];
   }
   if (stack.id === "dotnet") {
-    const [newest = "9.0", ...older] = newestFirst(list(input, "dotnet-versions"));
+    const [newest = "10.0", ...older] = newestFirst(list(input, "dotnet-versions"));
     return [
       {
         key: "dotnet",
diff --git a/src/stacks/dotnet.ts b/src/stacks/dotnet.ts
index b42400b..76b87cd 100644
--- a/src/stacks/dotnet.ts
+++ b/src/stacks/dotnet.ts
@@ -63,7 +63,7 @@ export const dotnetStack: StackPack = {
       ci: {
         workflow: "stack-dotnet.yml",
         with: {
-          "dotnet-versions": JSON.stringify(stringList("dotnet", options, "versions") ?? ["8.0", "9.0"]),
+          "dotnet-versions": JSON.stringify(stringList("dotnet", options, "versions") ?? ["10.0"]),
           os: JSON.stringify(stringList("dotnet", options, "os") ?? ["ubuntu-latest"]),
           commands: JSON.stringify([
             `dotnet restore${target}`,
diff --git a/test/platforms-gitlab-stacks.test.ts b/test/platforms-gitlab-stacks.test.ts
index 565785b..4a8209c 100644
--- a/test/platforms-gitlab-stacks.test.ts
+++ b/test/platforms-gitlab-stacks.test.ts
@@ -230,6 +230,9 @@ describe("gitlab ci for the other stacks", () => {
         "<Project>\n  <PropertyGroup>\n    <Version>0.1.0</Version>\n  </PropertyGroup>\n</Project>\n",
     });
     expectBump(versioned, ["Directory.Build.props"]);
+    // with no versions set, the .NET 10 SDK alone
+    expect(versioned.ci.dotnet?.image).toBe("mcr.microsoft.com/dotnet/sdk:10.0");
+    expect(versioned.ci.dotnet?.script?.[0]).toBe("dotnet restore");
   });
 
   it("script: a job per kind of script, with the versions the GitHub workflow pins", async () => {
diff --git a/test/stacks-dotnet.test.ts b/test/stacks-dotnet.test.ts
index 4bd90e7..6697882 100644
--- a/test/stacks-dotnet.test.ts
+++ b/test/stacks-dotnet.test.ts
@@ -22,7 +22,7 @@ it("restores, checks formatting, builds and tests, and releases through Director
   expect(stack.ci).toEqual({
     workflow: "stack-dotnet.yml",
     with: {
-      "dotnet-versions": '["8.0","9.0"]',
+      "dotnet-versions": '["10.0"]',
       os: '["ubuntu-latest"]',
       commands:
         '["dotnet restore","dotnet format --verify-no-changes --no-restore","dotnet build --no-restore","dotnet test --no-build"]',