OpenSilver 3.1, the latest version of Userware’s open-source framework for cross-platform .NET development, has arrived with what the company calls the first-ever drag-and-drop XAML designer for Microsoft’s Visual Studio Code editor.
Announced December 10, the OpenSilver 3.1 SDK can be downloaded from the project website. The XAML designer is described by Userware as a major milestone in cross-platform .NET development. Previously, XAML UI design was mostly limited to Visual Studio on Windows, leaving developers on macOS and Linux without visual design tools, the company said. OpenSilver 3.1 introduces a fully cross-platform designer, enabling developers to create user interfaces visually in VS Code on any operating system. The designer is available directly in VS Code; an online version is available at xaml.io.
OpenSilver is perhaps best known as a replacement for Microsoft’s Silverlight rich Internet application framework. As part of Userware’s “WPF everywhere” strategy, OpenSilver 3.1 adds support for several Windows Presentation Framework features including DynamicResource, MultiBinding, x:Static, and UniformGrid. These features are intended to make it easier to build feature-rich applications with familiar WPF tools, Userware said. More WPF support is planned for mid-2025, with backing for features such as triggers and styles.