diff --git a/.github/actions/msbuild/Build-DotNetFrameworkSolutionOrProject.ps1 b/.github/actions/msbuild/Build-DotNetFrameworkSolutionOrProject.ps1
index d94a64a7d..9fa616fe9 100644
--- a/.github/actions/msbuild/Build-DotNetFrameworkSolutionOrProject.ps1
+++ b/.github/actions/msbuild/Build-DotNetFrameworkSolutionOrProject.ps1
@@ -1,6 +1,7 @@
 param (
     [string] $SolutionOrProject,
     [string] $Verbosity,
+    [string] $TreatWarningsAsErrors,
     [string] $EnableCodeAnalysis,
     [string] $Version,
     [string] $Switches)
@@ -10,26 +11,37 @@ function ConvertTo-Array([string] $rawInput)
     $rawInput.Replace("`r", "").Split("`n") | ForEach-Object { $PSItem.Trim() } | Where-Object { $PSItem }
 }
 
+nuget restore $SolutionOrProject
+
 Write-Output ".NET version number: $Version"
 
+$commonSwitches = ConvertTo-Array @"
+    --verbosity:$Verbosity
+    -p:RunAnalyzersDuringBuild=$EnableCodeAnalysis
+    -p:Retries=4
+    -p:RetryDelayMilliseconds=1000
+    -p:Version=$Version
+"@
+
+if ($TreatWarningsAsErrors -eq "true")
+{
+    $commonSwitches += ConvertTo-Array @"
+        --warnaserror
+        -p:TreatWarningsAsErrors=true
+"@
+}
+
 if (Test-Path src/Utilities/Lombiq.Gulp.Extensions/Lombiq.Gulp.Extensions.csproj)
 {
     Write-Output "::group::Gulp Extensions found. It needs to be explicitly built before the solution."
 
     # These need to be different than those for msbuild.
-    $gulpBuildSwitches = ConvertTo-Array @"
+    $gulpBuildSwitches = $commonSwitches + (ConvertTo-Array @"
         --configuration:Release
         --nologo
-        --verbosity:$Verbosity
-        --warnaserror
         --warnAsMessage:MSB3026
         --consoleLoggerParameters:NoSummary
-        -p:TreatWarningsAsErrors=true
-        -p:RunAnalyzersDuringBuild=$EnableCodeAnalysis
-        -p:Retries=4
-        -p:RetryDelayMilliseconds=1000
-        -p:Version=$Version
-"@
+"@)
 
     $startTime = [DateTime]::Now
     dotnet build src/Utilities/Lombiq.Gulp.Extensions/Lombiq.Gulp.Extensions.csproj @gulpBuildSwitches
@@ -41,18 +53,11 @@ if (Test-Path src/Utilities/Lombiq.Gulp.Extensions/Lombiq.Gulp.Extensions.csproj
 
 # -p:Retries and -p:RetryDelayMilliseconds are used to retry builds when they fail due to random locks.
 
-$buildSwitches = ConvertTo-Array @"
+$buildSwitches = $commonSwitches + (ConvertTo-Array @"
     -p:Configuration=Release
     -restore
-    --verbosity:$Verbosity
-    --warnaserror
-    -p:TreatWarningsAsErrors=true
-    -p:RunAnalyzersDuringBuild=$EnableCodeAnalysis
-    -p:Retries=4
-    -p:RetryDelayMilliseconds=1000
-    -p:Version=$Version
     $Switches
-"@
+"@)
 
 Write-Output "Building solution or project with ``msbuild $SolutionOrProject $($buildSwitches -join " ")``."
 
diff --git a/.github/actions/msbuild/action.yml b/.github/actions/msbuild/action.yml
index de61cd22d..e0f09add4 100644
--- a/.github/actions/msbuild/action.yml
+++ b/.github/actions/msbuild/action.yml
@@ -10,6 +10,10 @@ inputs:
     required: false
     default: quiet
     description: Verbosity parameter for msbuild.
+  treat-warnings-as-errors:
+    required: false
+    default: "true"
+    description: If set to "true", warnings produced during the build will be treated as errors and fail the build.
   enable-code-analysis:
     required: false
     default: "true"
@@ -61,6 +65,7 @@ runs:
         $allSwitches = @{
             SolutionOrProject = (Get-ChildItem ${{ inputs.solution-or-project-path }}).FullName
             Verbosity = "${{ inputs.verbosity }}"
+            TreatWarningsAsErrors = "${{ inputs.treat-warnings-as-errors }}"
             EnableCodeAnalysis = "${{ inputs.enable-code-analysis }}"
             Version = "${{ inputs.publish-version }}"
             Switches = $givenSwitches
diff --git a/.github/workflows/msbuild-and-test.yml b/.github/workflows/msbuild-and-test.yml
index f0109f886..882955f67 100644
--- a/.github/workflows/msbuild-and-test.yml
+++ b/.github/workflows/msbuild-and-test.yml
@@ -42,6 +42,11 @@ on:
         type: string
         default: quiet
         description: Verbosity parameter for msbuild.
+      build-treat-warnings-as-errors:
+        required: false
+        type: string
+        default: "true"
+        description: Indicates whether warnings should be treated as errors during msbuild.
       build-enable-code-analysis:
         required: false
         type: string
@@ -96,6 +101,7 @@ jobs:
           directory: ${{ inputs.build-directory }}
           solution-or-project-path: ${{ inputs.solution-or-project-path }}
           verbosity: ${{ inputs.build-verbosity }}
+          treat-warnings-as-errors: ${{ inputs.build-treat-warnings-as-errors }}
           enable-code-analysis: ${{ inputs.build-enable-code-analysis }}
 
       - name: Tests