Add `dotnet format` to CI to check C# style

.github/workflows/static_checks.yml

@@ -63,3 +63,7 @@ jobs:
       - name: Style checks via clang-format (clang_format.sh)
         run: |
           bash ./misc/scripts/clang_format.sh
+
+      - name: Style checks via dotnet format (dotnet_format.sh)
+        run: |
+          bash ./misc/scripts/dotnet_format.sh

misc/scripts/dotnet_format.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# This script runs dotnet format on all relevant files in the repo.
+# This is the primary script responsible for fixing style violations in C# files.
+
+set -uo pipefail
+
+# Loops through all C# projects tracked by Git.
+git ls-files -- '*.csproj' \
+                ':!:.git/*' ':!:thirdparty/*' ':!:platform/android/java/lib/src/com/google/*' ':!:*-so_wrap.*' |
+while read -r f; do
+    # Run dotnet format.
+    dotnet format "$f"
+done
+
+diff=$(git diff --color)
+
+# If no diff has been generated all is OK, clean up, and exit.
+if [ -z "$diff" ] ; then
+    printf "Files in this commit comply with the dotnet format style rules.\n"
+    exit 0
+fi
+
+# A diff has been created, notify the user, clean up, and exit.
+printf "\n*** The following changes have been made to comply with the formatting rules:\n\n"
+echo "$diff"
+printf "\n*** Please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+exit 1