6.12.0
22 Jan 2026
New Features
Nullable Types Support
Linx now supports nullable value types, giving you greater control and precision when handling data. In programming, value types such as integers, decimals, booleans, and dates always have a default value (e.g., 0 for integers, false for booleans). However, there are many scenarios where you need to distinguish between "no value has been set" and "the value is zero or false". Nullable types solve this problem by allowing value types to also hold a null value, representing the absence of data.
With this release, value types can be explicitly marked as nullable when defining custom types in Linx. This is particularly useful when working with databases, APIs, or external systems where fields may be optional or missing. For example, an optional date field in a database record can now be accurately represented as a nullable DateTime, rather than requiring a placeholder value or separate flag to indicate whether the date was provided.
Throughout the Designer, nullable types are clearly indicated with a ? suffix on the type name (e.g., Integer?, DateTime?, Boolean?), making it easy to identify which properties can hold null values at a glance. This visual distinction helps prevent null reference errors and makes your solutions more robust when processing data from various sources.
Debug Tests in Test Explorer
Tests can now be debugged directly from the Test Explorer. During debugging, one-time setup and teardown routines run before and after each test, ensuring debugging behaves identical to normal test execution. Also, step-through execution and variable inspection make it easier to diagnose and resolve test failures.
TestProject as Sibling Project
Test projects are now consistently represented as sibling projects to solutions throughout the Designer. Previously, test projects appeared as siblings in the Solution Explorer but as children in dropdowns, which was inconsistent.
TestRunner Offline Support
The TestRunner can now run offline, using offline packages to execute tests without an active internet connection.
Result Type on CallXeroAPI
The CallXeroAPI operation now allows you to set the result type to an expected type. Previously, the result was always a string. With this update, you can define the structure you expect from the API response, making it easier to work with strongly-typed data and reducing the need for manual parsing.
Deprecated Function Warnings
Deprecated functions now display a warning in the Designer, making it easier to identify and update them before they are removed in future releases.
RESTHost Editor Watermark
The RESTHost editor now displays a watermark when empty, providing guidance on how to get started with configuring your REST service.
Standardised Window Buttons
The window maximize, minimize, and close buttons have been standardised for a more consistent user experience.
Fixes
Designer
Fixed: Double-clicking a Linx 6 solution incorrectly opened it in Linx 7 Designer
Fixed: NullReferenceException when dragging a RESTHost into the solution
Fixed: A reference to a property of a custom type caused Designer to crash
Fixed: Solution update failed when solution name contained a dot
Fixed: Generated type IDs were not updated when copy/pasting functions or services
Fixed: Expression Editor Home and End keys not responding
Fixed: List item was incorrectly copied into list on instantiation instead of being referenced
Fixed: Pasted function's tab was not scrolled into view when many tabs were open
Fixed: Arrow keys needed to be pressed twice to navigate the Test Explorer tree
Fixed: Information about failed tests could not be copied
Fixed: Expression editor lost track of expression length
Fixed: RESTHost prevented UI updates after adding operations
Fixed: Drag and drop of a function above another function failed
Fixed: Copy and paste of a process containing a service function call failed
Fixed: Expression Editor displayed JSON expression as gibberish. Expression Editor now converts the JSON expression to a JSON string expression.
Server
Fixed: Reinstalling Linx Server with a port number having fewer digits than before caused installation to fail
Fixed: Solutions with services in TestProject caused Internal Server Error on Linx Server
Fixed: Server stopped loading solutions when one solution failed to load
Plugins
Fixed: Updating the Excel plugin caused an EditorResources exception
Fixed: Function parameters were lost after updating a plugin
Fixed: Updating the File plugin caused an EditorResources exception
Fixed: Updating a plugin to the latest version caused an ArgumentException
Installation
Fixed: Offline installation failed due to missing WebView2
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