Merge pull request #1 from adamhathcock/fix-nullable

Fix nullable

InterfaceGenerator/AutoInterfaceGenerator.cs

@@ -145,6 +145,11 @@ namespace InterfaceGenerator
             var interfaceName = InferInterfaceName(implTypeSymbol, attributeData);
             var visibilityModifier = InferVisibilityModifier(implTypeSymbol, attributeData);
 
+            //https://stackoverflow.com/questions/55492214/the-annotation-for-nullable-reference-types-should-only-be-used-in-code-within-a fix for nullable
+            if (implTypeSymbol.NullableAnnotation == NullableAnnotation.Annotated)
+            {
+                codeWriter.WriteLine("#nullable enable");
+            }
             codeWriter.WriteLine("namespace {0}", namespaceName);
             codeWriter.WriteLine("{");
 
@@ -163,6 +168,10 @@ namespace InterfaceGenerator
             --codeWriter.Indent;
 
             codeWriter.WriteLine("}");
+            if (implTypeSymbol.NullableAnnotation == NullableAnnotation.Annotated)
+            {
+                codeWriter.WriteLine("#nullable restore");
+            }
 
             codeWriter.Flush();
             stream.Seek(0, SeekOrigin.Begin);