From 1c41b6b753aad942af0d40e5b16100fdf99dc747 Mon Sep 17 00:00:00 2001
From: CodingFlow <3643313+CodingFlow@users.noreply.github.com>
Date: Mon, 15 Dec 2025 19:43:56 -0500
Subject: [PATCH] Prevent exception if there are no options types with the
 attribute.

---
 OptionsBindingsGenerator.UnitTests/Tests.cs | 25 +++++++++++++++++++++
 OptionsBindingsGenerator/Main.cs            |  8 +++++--
 TestLibrary/NoBindingsOptions.cs            | 11 +++++++++
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 TestLibrary/NoBindingsOptions.cs

diff --git a/OptionsBindingsGenerator.UnitTests/Tests.cs b/OptionsBindingsGenerator.UnitTests/Tests.cs
index 1b6f86d..e498d76 100644
--- a/OptionsBindingsGenerator.UnitTests/Tests.cs
+++ b/OptionsBindingsGenerator.UnitTests/Tests.cs
@@ -17,6 +17,31 @@ public void Setup()
         implementationAssembly = GetAssembly("OptionsBindingsGenerator");
     }
 
+    [Test]
+    public async Task NoBindings()
+    {
+        var source = await ReadCSharpFile<NoBindingsOptions>(true);
+
+        await new VerifyCS.Test
+        {
+            CompilerDiagnostics = CompilerDiagnostics.None,
+            TestState = {
+                ReferenceAssemblies = ReferenceAssemblies.Net.Net90,
+                AdditionalReferences =
+                {
+                    implementationAssembly,
+                    GetAssembly("TestLibrary")
+                },
+
+                Sources = { source },
+                GeneratedSources =
+                {
+                    
+                },
+            },
+        }.RunAsync();
+    }
+
     [Test]
     public async Task MixedBindings()
     {
diff --git a/OptionsBindingsGenerator/Main.cs b/OptionsBindingsGenerator/Main.cs
index b810d52..802ddc1 100644
--- a/OptionsBindingsGenerator/Main.cs
+++ b/OptionsBindingsGenerator/Main.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Immutable;
+using System.Linq;
 using System.Text;
 using System.Threading;
 using Microsoft.CodeAnalysis;
@@ -36,9 +37,12 @@ private static INamedTypeSymbol GetSemanticTargetForGeneration(GeneratorAttribut
 
         private static void Execute(SourceProductionContext context, ImmutableArray<INamedTypeSymbol> typeSymbols)
         {
-            var (source, className) = OutputGenerator.GenerateOutput(typeSymbols);
+            if (typeSymbols.Any())
+            {
+                var (source, className) = OutputGenerator.GenerateOutput(typeSymbols);
 
-            context.AddSource($"{className}.generated.cs", SourceText.From(source, Encoding.UTF8, SourceHashAlgorithm.Sha256));
+                context.AddSource($"{className}.generated.cs", SourceText.From(source, Encoding.UTF8, SourceHashAlgorithm.Sha256));
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/TestLibrary/NoBindingsOptions.cs b/TestLibrary/NoBindingsOptions.cs
new file mode 100644
index 0000000..02e351e
--- /dev/null
+++ b/TestLibrary/NoBindingsOptions.cs
@@ -0,0 +1,11 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace TestLibrary;
+
+internal record NoBindingsOptions
+{
+    [Required]
+    public required string ServiceHost { get; init; }
+
+    public required string Port { get; init; }
+}