From 3c35b9b5c53e3e10be0cc38545e3cecbc1875f44 Mon Sep 17 00:00:00 2001
From: Jan Jones <janjones@microsoft.com>
Date: Fri, 26 Jul 2024 09:15:09 +0200
Subject: [PATCH] Avoid "missing toolset" error in design-time builds (#42360)

---
 .../targets/Microsoft.NET.Sdk.targets                         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
index 7862ab8fd8c7..642e1057064c 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
@@ -250,7 +250,9 @@ Copyright (c) .NET Foundation. All rights reserved.
         Condition="'@(PackageReference->AnyHaveMetadataValue('Identity', 'Microsoft.Net.Compilers.Toolset.Framework'))' == 'true'" />
   </Target>
 
-  <Target Name="_CheckMicrosoftNetSdkCompilersToolsetPackageExists" Condition="'$(_NeedToDownloadMicrosoftNetSdkCompilersToolsetPackage)' == 'true'" BeforeTargets="CoreCompile">
+  <Target Name="_CheckMicrosoftNetSdkCompilersToolsetPackageExists"
+          Condition="'$(_NeedToDownloadMicrosoftNetSdkCompilersToolsetPackage)' == 'true' and '$(DesignTimeBuild)' != 'true'"
+          BeforeTargets="CoreCompile">
     <!-- If users did not run restore or it failed to download the Microsoft.Net.Sdk.Compilers.Toolset package
          (but they proceeded to build, e.g., in Visual Studio), display an error with suggestions how to fix the problem. -->
     <NETSdkError ResourceName="MicrosoftNetSdkCompilersToolsetNotFound"