Fixes [3164]-V105-LTS Font property values are being serialized depending of the current culture in exported XML theme (#3179)

Force en-US TypeConverter serialization to prevent localized values
(e.g., “(Ninguna)”) and ensure the exported theme XML is always in
English.

Fixes #3164

Author: PWagner1

Documents/Changelog/Changelog.md

@@ -46,8 +46,9 @@
 
 ## 2026-04-20 - Build 2604 (Version 105-LTS - Patch 2) - April 2026
 
+* Resolved [#3164](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3164), Toolkit: Font property values are being serialized depending of the current culture in exported XML theme file
 * Resolved [#3013](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3013), Maximized form's size exceeds the screen's working area
-* Implemented [#3173](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3173), Use pattern matching
+* Implemented [#3173](https://github.com/Krypton-Suite/Standad-Toolkit/issues/3173), Use pattern matching
 * Resolved [#3201](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3201), Resolves potential memory leaks in `KryptonDataGridViewRatingColumn`
 * Resolved [#3163](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3163), Form Icon Misplaced in Contextual Tabs
 * Implemented [#3113](https://github.com/Krypton-Suite/Standard-Toolkit/issues/3113), TextBox item for KryptonContextMenu-Items

Source/Krypton Components/Krypton.Toolkit/Controls Toolkit/KryptonCustomPaletteBase.cs

@@ -3595,12 +3595,26 @@ private void ExportObjectToElement(XmlDocument doc,
                             }
                             else
                             {
-                                // We need the type converter to create a string representation
-                                var converter = TypeDescriptor.GetConverter(prop.PropertyType);
-
-                                // Save to an invariant string so that load is not affected by culture
-                                childElement.SetAttribute(@"Value", converter.ConvertToInvariantString(childObj!));
-                            }
+								// We need the type converter to create a string representation
+								var cultureInfo = new CultureInfo("en-US");
+
+								// We need the type converter to create a string representation
+								var converter = TypeDescriptor.GetConverter(prop.PropertyType);
+
+								// Fix [3164]: "Font property values are not serialized correctly in the exported XML file."
+								// Force serialization using the en-US culture to prevent localization issues.
+								string? stringValue = string.Empty;
+
+								if (null != childObj)
+								{
+									stringValue = converter.ConvertTo(context: null,
+																			culture: cultureInfo,
+																			value: childObj!,
+																			destinationType: typeof(string)) as string;
+								}
+
+								childElement.SetAttribute(@"Value", stringValue ?? string.Empty);
+							}
                         }
                     }
                 }