Fix IsStringEnumArray for nullable enum arrays

src/NJsonSchema.CodeGeneration.CSharp.Tests/EnumTests.cs

@@ -648,5 +648,44 @@ public async Task When_enum_has_a_format_then_enum_is_generated_with_correct_bas
             await VerifyHelper.Verify(code);
             CSharpCompiler.AssertCompile(code);
         }
+
+        [Fact]
+        public async Task When_nullable_enum_array_then_IsStringEnumArray_is_true()
+        {
+            // Arrange - schema with a nullable string enum array (items uses oneOf with null + $ref)
+            var json = @"
+{
+    ""type"": ""object"",
+    ""properties"": {
+        ""colors"": {
+            ""type"": ""array"",
+            ""items"": {
+                ""oneOf"": [
+                    { ""type"": ""null"" },
+                    { ""$ref"": ""#/definitions/Color"" }
+                ]
+            }
+        }
+    },
+    ""definitions"": {
+        ""Color"": {
+            ""type"": ""string"",
+            ""enum"": [""Red"", ""Green"", ""Blue""]
+        }
+    }
+}";
+            var schema = await JsonSchema.FromJsonAsync(json);
+
+            // Act
+            var generator = new CSharpGenerator(schema, new CSharpGeneratorSettings
+            {
+                ClassStyle = CSharpClassStyle.Poco
+            });
+            var code = generator.GenerateFile("MyClass");
+
+            // Assert - should have StringEnumConverter for the nullable enum array
+            await VerifyHelper.Verify(code);
+            CSharpCompiler.AssertCompile(code);
+        }
     }
 }

src/NJsonSchema.CodeGeneration.CSharp.Tests/Snapshots/EnumTests.When_nullable_enum_array_then_IsStringEnumArray_is_true.verified.txt

@@ -0,0 +1,44 @@
+//----------------------
+// <auto-generated>
+// </auto-generated>
+//----------------------
+
+
+namespace MyNamespace
+{
+    #pragma warning disable // Disable all warnings
+
+    public enum Color
+    {
+
+        [System.Runtime.Serialization.EnumMember(Value = @"Red")]
+        Red = 0,
+
+
+        [System.Runtime.Serialization.EnumMember(Value = @"Green")]
+        Green = 1,
+
+
+        [System.Runtime.Serialization.EnumMember(Value = @"Blue")]
+        Blue = 2,
+
+
+    }
+
+    public partial class MyClass
+    {
+
+        [Newtonsoft.Json.JsonProperty("colors", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore, ItemConverterType = typeof(Newtonsoft.Json.Converters.StringEnumConverter))]
+        public System.Collections.Generic.ICollection<Color?> Colors { get; set; }
+
+        private System.Collections.Generic.IDictionary<string, object> _additionalProperties;
+
+        [Newtonsoft.Json.JsonExtensionData]
+        public System.Collections.Generic.IDictionary<string, object> AdditionalProperties
+        {
+            get { return _additionalProperties ?? (_additionalProperties = new System.Collections.Generic.Dictionary<string, object>()); }
+            set { _additionalProperties = value; }
+        }
+
+    }
+}

src/NJsonSchema.CodeGeneration/Models/PropertyModelBase.cs

@@ -61,8 +61,8 @@ protected PropertyModelBase(
         public bool IsStringEnumArray =>
             _property.ActualTypeSchema.IsArray &&
             _property.ActualTypeSchema.Item != null &&
-            _property.ActualTypeSchema.Item.ActualSchema.IsEnumeration &&
-            _property.ActualTypeSchema.Item.ActualSchema.Type.IsString();
+            _property.ActualTypeSchema.Item.ActualTypeSchema.IsEnumeration &&
+            _property.ActualTypeSchema.Item.ActualTypeSchema.Type.IsString();
 
         /// <summary>Gets the property extension data.</summary>
         public IDictionary<string, object?>? ExtensionData => _property.ExtensionData;