From a7ac5423c28aa731c986aebd9b25627b5a82e1fe Mon Sep 17 00:00:00 2001
From: Steve Dunn <steve@dunnhq.com>
Date: Wed, 29 May 2024 09:38:38 +0100
Subject: [PATCH] Invert check for langversion as `Preview` is set to
 `int32.maxvalue -1`

---
 src/Vogen/ValueObjectGenerator.cs |  2 +-
 src/Vogen/WriteStaticAbstracts.cs | 13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/Vogen/ValueObjectGenerator.cs b/src/Vogen/ValueObjectGenerator.cs
index 35ee66b58d..e7ed70029a 100644
--- a/src/Vogen/ValueObjectGenerator.cs
+++ b/src/Vogen/ValueObjectGenerator.cs
@@ -88,7 +88,7 @@ static void Execute(
 
                 internalDiags.RecordResolvedGlobalConfig(mergedConfig);
                 
-                WriteStaticAbstracts.WriteIfNeeded(mergedConfig, context, compilation);
+                WriteStaticAbstracts.WriteInterfacesAndMethodsIfNeeded(mergedConfig, context, compilation);
 
                 WriteSystemTextJsonConverterFactories.WriteIfNeeded(mergedConfig, workItems, context, compilation);
 
diff --git a/src/Vogen/WriteStaticAbstracts.cs b/src/Vogen/WriteStaticAbstracts.cs
index a8ef792bc3..8cf5caa0bf 100644
--- a/src/Vogen/WriteStaticAbstracts.cs
+++ b/src/Vogen/WriteStaticAbstracts.cs
@@ -7,11 +7,11 @@ namespace Vogen;
 
 internal class WriteStaticAbstracts
 {
-    public static void WriteIfNeeded(VogenConfiguration? globalConfig,
+    public static void WriteInterfacesAndMethodsIfNeeded(VogenConfiguration? globalConfig,
         SourceProductionContext context,
         Compilation compilation)
     {
-        if (compilation is CSharpCompilation { LanguageVersion: < LanguageVersion.CSharp11 })
+        if (compilation is not CSharpCompilation { LanguageVersion: >= LanguageVersion.CSharp11 })
         {
             return;
         }
@@ -30,7 +30,7 @@ public static void WriteIfNeeded(VogenConfiguration? globalConfig,
 
              {GenerateSource()}
              """;
-        
+
         context.AddSource("VogenInterfaces_g.cs", source);
 
         string GenerateSource()
@@ -75,6 +75,7 @@ string GenerateFactoryMethodsIfNeeded()
             }
         }
 
+
         string GenerateCastingOperatorsIfNeeded()
         {
             StringBuilder sb = new StringBuilder();
@@ -131,11 +132,11 @@ public static string WriteHeaderIfNeeded(string precedingText, VoWorkItem item,
             return string.Empty;
         }
 
-        if (item.LanguageVersion <= LanguageVersion.CSharp11)
+        if (item.LanguageVersion >= LanguageVersion.CSharp11)
         {
-            return string.Empty;
+            return precedingText + $" IVogen<{tds.Identifier}, {item.UnderlyingTypeFullName}>";
         }
 
-        return precedingText + $" IVogen<{tds.Identifier}, {item.UnderlyingTypeFullName}>";
+        return string.Empty;
     }
 }