C# Implementation (#2)

C# implementation of SEP-1763

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/csharp.yml

@@ -0,0 +1,82 @@
+name: C# CI
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'csharp/**'
+      - '.github/workflows/csharp.yml'
+  pull_request:
+    paths:
+      - 'csharp/**'
+      - '.github/workflows/csharp.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  csharp-build:
+    name: "Build"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.0.x'
+      - name: Restore dependencies
+        run: |
+          cd csharp/sdk
+          dotnet restore
+      - name: Build
+        run: |
+          cd csharp/sdk
+          dotnet build --no-restore --configuration Release
+
+  csharp-test:
+    name: "Unit Tests"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        dotnet-version: ['8.0.x', '9.0.x']
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ matrix.dotnet-version }}
+      - name: Restore dependencies
+        run: |
+          cd csharp/sdk
+          dotnet restore
+      - name: Run tests
+        run: |
+          cd csharp/sdk
+          dotnet test --no-restore --verbosity normal --collect:"XPlat Code Coverage"
+
+  csharp-pack:
+    name: "Package"
+    runs-on: ubuntu-latest
+    needs: [csharp-build, csharp-test]
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.0.x'
+      - name: Restore dependencies
+        run: |
+          cd csharp/sdk
+          dotnet restore
+      - name: Create NuGet package
+        run: |
+          cd csharp/sdk
+          dotnet pack --no-restore --configuration Release --output ./artifacts
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: nuget-packages
+          path: csharp/sdk/artifacts/*.nupkg

.github/workflows/status-check.yml

@@ -7,7 +7,7 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
   workflow_run:
-    workflows: ["Python CI", "Go CI", "TypeScript CI"]
+    workflows: ["C# CI", "Python CI", "Go CI", "TypeScript CI"]
     types: [completed]
 
 permissions:
@@ -42,6 +42,9 @@ jobs:
         uses: dorny/paths-filter@v3
         with:
           filters: |
+            csharp:
+              - 'csharp/**'
+              - '.github/workflows/csharp.yml'
             python:
               - 'python/**'
               - '.github/workflows/python.yml'
@@ -62,6 +65,12 @@ jobs:
 
             // Define required checks per language
             const requiredChecks = {
+              csharp: [
+                'C# CI / Build',
+                'C# CI / Unit Tests (8.0.x)',
+                'C# CI / Unit Tests (9.0.x)',
+                'C# CI / Package'
+              ],
               python: [
                 'Python CI / Linting',
                 'Python CI / Unit Tests (3.10)',
@@ -84,6 +93,7 @@ jobs:
 
             // Get changed files from previous step
             const changedFiles = {
+              csharp: ${{ steps.changed-files.outputs.csharp }} === 'true',
               python: ${{ steps.changed-files.outputs.python }} === 'true',
               go: ${{ steps.changed-files.outputs.go }} === 'true',
               typescript: ${{ steps.changed-files.outputs.typescript }} === 'true'