Userware has released OpenSilver 3.3, an update to the open-source framework for building cross-platform applications using C# and XAML. OpenSilver 3.3 lets Blazor components for web development run directly inside XAML applications, streamlining the process of running these components.

Userware unveiled OpenSilver 3.3 on January 27. OpenSilver SDKs for Microsoft’s Visual Studio and Visual Studio Code can be downloaded from opensilver.net.

With the Blazor boost in OpenSilver 3.3, Blazor components run directly inside an XAML visual tree, sharing the same DOM and the same runtime. Developers can drop a MudBlazor data grid, a DevExpress rich text editor, or any Blazor component directly into their XAML application without requiring JavaScript bridges or interop wrappers, according to Userware. Because OpenSilver runs on WebAssembly for browsers and .NET MAUI Hybrid for native apps, the same code deploys to Web, iOS, Android, Windows, macOS, and Linux.

The company did warn, though, that Razor code embedded inside XAML will currently show errors at design time but will compile and run correctly. Workarounds include wrapping the Razor code in CDATA, using separate .razor files, or filtering to “Build Only” errors.

Open source OpenSilver is a replacement for Microsoft Silverlight, a rich Internet application framework that was discontinued in 2021 and is no longer supported. For developers maintaining a Silverlight or Windows Presentation Foundation app, Blazor integration offers a way to modernize incrementally. Users can identify controls that need updating, such as an old data grid or a basic text editor, and replace them with modern Blazor equivalents.