From 344675245d4ba67a8cb582ac5214b80e268399fb Mon Sep 17 00:00:00 2001
From: Andriy Svyryd <Andriy.Svyryd@microsoft.com>
Date: Thu, 4 Dec 2025 14:13:48 -0800
Subject: [PATCH 1/2] Allow tools to run on projects targeting multiple
 frameworks.

Fixes #37230
---
 src/dotnet-ef/Project.cs                      | 20 +++++++++++++++++++
 .../Properties/Resources.Designer.cs          |  8 +++++++-
 src/dotnet-ef/Properties/Resources.resx       |  3 +++
 src/dotnet-ef/RootCommand.cs                  |  6 +++++-
 4 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/dotnet-ef/Project.cs b/src/dotnet-ef/Project.cs
index 578550045ce..8e9ea0cc8dc 100644
--- a/src/dotnet-ef/Project.cs
+++ b/src/dotnet-ef/Project.cs
@@ -85,6 +85,11 @@ public static Project FromFile(
         var exitCode = Exe.Run("dotnet", args, handleOutput: line => output.AppendLine(line));
         if (exitCode != 0)
         {
+            if (framework == null && HasMultipleTargetFrameworks(file))
+            {
+                throw new CommandException(Resources.MultipleTargetFrameworks);
+            }
+
             throw new CommandException(Resources.GetMetadataFailed);
         }
 
@@ -131,6 +136,21 @@ private record class ProjectMetadata
         public Dictionary<string, Dictionary<string, string>[]> Items { get; set; } = null!;
     }
 
+    private static bool HasMultipleTargetFrameworks(string file)
+    {
+        var args = new List<string> { "msbuild", "/getProperty:TargetFrameworks", file };
+
+        var output = new StringBuilder();
+        var exitCode = Exe.Run("dotnet", args, handleOutput: line => output.AppendLine(line));
+        if (exitCode != 0)
+        {
+            return false;
+        }
+
+        var outputString = output.ToString();
+        return !string.IsNullOrEmpty(outputString) && !outputString.IsWhiteSpace();
+    }
+
     private static void CopyBuildHost(
         Dictionary<string, string>[] runtimeCopyLocalItems,
         string targetDir)
diff --git a/src/dotnet-ef/Properties/Resources.Designer.cs b/src/dotnet-ef/Properties/Resources.Designer.cs
index 9c2b87d72b2..425fb441247 100644
--- a/src/dotnet-ef/Properties/Resources.Designer.cs
+++ b/src/dotnet-ef/Properties/Resources.Designer.cs
@@ -317,6 +317,12 @@ public static string MultipleProjectsInDirectory(object? projectDir)
         public static string MultipleStartupProjects
             => GetString("MultipleStartupProjects");
 
+        /// <summary>
+        ///     The project targets multiple frameworks. Use the --framework option to specify which target framework to use.
+        /// </summary>
+        public static string MultipleTargetFrameworks
+            => GetString("MultipleTargetFrameworks");
+
         /// <summary>
         ///     The namespace to use. Matches the directory by default.
         /// </summary>
@@ -324,7 +330,7 @@ public static string NamespaceDescription
             => GetString("NamespaceDescription");
 
         /// <summary>
-        ///     Additionally generate all the code required for NativeAOT compilation and precompiled queries (experimental).
+        ///     Generate additional code in the compiled model required for NativeAOT compilation and precompiled queries (experimental).
         /// </summary>
         public static string NativeAotDescription
             => GetString("NativeAotDescription");
diff --git a/src/dotnet-ef/Properties/Resources.resx b/src/dotnet-ef/Properties/Resources.resx
index 38d2f89eed8..ef4e49c1f06 100644
--- a/src/dotnet-ef/Properties/Resources.resx
+++ b/src/dotnet-ef/Properties/Resources.resx
@@ -264,6 +264,9 @@
   <data name="MultipleStartupProjects" xml:space="preserve">
     <value>More than one project was found in the current working directory. Use the --startup-project option.</value>
   </data>
+  <data name="MultipleTargetFrameworks" xml:space="preserve">
+    <value>The project targets multiple frameworks. Use the --framework option to specify which target framework to use.</value>
+  </data>
   <data name="NamespaceDescription" xml:space="preserve">
     <value>The namespace to use. Matches the directory by default.</value>
   </data>
diff --git a/src/dotnet-ef/RootCommand.cs b/src/dotnet-ef/RootCommand.cs
index 792139f9598..686ea398b30 100644
--- a/src/dotnet-ef/RootCommand.cs
+++ b/src/dotnet-ef/RootCommand.cs
@@ -66,7 +66,11 @@ protected override int Execute(string[] _)
         Reporter.WriteVerbose(Resources.UsingProject(projectFile));
         Reporter.WriteVerbose(Resources.UsingStartupProject(startupProjectFile));
 
-        var project = Project.FromFile(projectFile);
+        var project = Project.FromFile(
+            projectFile,
+            _framework!.Value(),
+            _configuration!.Value(),
+            _runtime!.Value());
         var startupProject = Project.FromFile(
             startupProjectFile,
             _framework!.Value(),

From 7402e513a14c42242df97276dafc5e0767713859 Mon Sep 17 00:00:00 2001
From: Andriy Svyryd <AndriySvyryd@users.noreply.github.com>
Date: Thu, 4 Dec 2025 15:31:23 -0800
Subject: [PATCH 2/2] Update src/dotnet-ef/Project.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 src/dotnet-ef/Project.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dotnet-ef/Project.cs b/src/dotnet-ef/Project.cs
index 8e9ea0cc8dc..ee15537fe52 100644
--- a/src/dotnet-ef/Project.cs
+++ b/src/dotnet-ef/Project.cs
@@ -148,7 +148,7 @@ private static bool HasMultipleTargetFrameworks(string file)
         }
 
         var outputString = output.ToString();
-        return !string.IsNullOrEmpty(outputString) && !outputString.IsWhiteSpace();
+        return !string.IsNullOrWhiteSpace(outputString);
     }
 
     private static void CopyBuildHost(