OpenSilver 3.1 was released on December 10, 2024, bringing new features and potential benefits for developers working with .NET and XAML. After the This latest update introduces tools that simplify building rich web applications, particularly for those who use Visual Studio Code and those considering migrating from WPF solutions. With features like an XAML Designer for Visual Studio Code, WPF for the Web, a modern UI theme, and support for .NET 9, OpenSilver 3.1 offers solutions for everyday challenges developers face today.
What Is OpenSilver?
OpenSilver is an open-source framework that extends the capabilities of .NET to create modern, browser-based applications. It builds on the legacy of Silverlight and WPF, allowing developers to leverage XAML, a widely used markup language for user interface (UI) design. OpenSilver supports seamless migrations and advanced web app development without requiring plugins by bypassing the gap between desktop and web.
Key Features of OpenSilver 3.1
Based on the official announcement, OpenSilver 3.1 introduces four main features designed to enhance productivity and unlock new possibilities:
- XAML Designer for Visual Studio Code
Developers can now use a drag-and-drop UI designer directly in Visual Studio Code. This cross-platform tool works seamlessly on Windows, macOS, and Linux, enabling developers to design UIs visually without switching to Windows or full Visual Studio environments. Access the online playground of XAML Designer to check out all its features. - WPF for the Web
This release strengthens support for several WPF features, including DynamicResource, MultiBinding, and x:Static, making it much easier to reproduce typical desktop-like experiences on the web. Although OpenSilver still isn’t fully compatible with WPF, the promise of expanded functionality on its roadmap makes the option an excellent alternative for the developer seeking to bring WPF applications to the browser. - Modern UI Theme
Inspired by Material and Fluent Design principles, the new UI theme offers light and dark modes with easy customization. Developers can adjust palettes and branding elements using built-in tools, ensuring their web apps look modern and user-friendly. This is an excellent answer of OpenSilver 3.1 to the inquiries of the developers for modern aesthetics apps users are expecting nowadays. - .NET 9 Compatibility
Less than a month after Microsoft released .NET 9 on November 12, 2024, OpenSilver, in its 3.1 release, already supports the fresh version of .NET. With support for .NET 9, developers benefit from faster app startup times, better debugging tools, and improved performance. This compatibility ensures that applications built with OpenSilver are future-proof.
Advantages of XAML Designer Over “Hot Reloading”
The XAML Designer offers distinct advantages compared to traditional “hot reloading” features. While hot reloading allows developers to see changes in real time, it lacks the intuitive, drag-and-drop visual interface provided by OpenSilver’s designer. For developers familiar with WPF, this feature reduces the learning curve, accelerates UI creation, and ensures accuracy by enabling them to work visually with XAML.
The XAML Designer also addresses the developers’ efficiency and speed in creating user interfaces. With over 100 ready-to-use controls (introduced in OpenSilver 3.0 released), the designer simplifies complex interface design tasks, saving time and effort.
How do You Install the XAML Designer for VS Code?
Currently (Dec 12, 2024), the XAML Designer is not in the Marketplace, so you cannot find it under the VS Code extensions. To install the XAML Designer for VS Code, you should:
- Download the VSIX file from the OpenSilver website download page.
- Install the VSIX file in VS Code via the option “Install from VSIX…”
- And you are ready to rock! Happy coding!
Why Migrate WPF Applications to the Web?
Migrating WPF applications to the web using OpenSilver offers several benefits:
- Cross-Platform Accessibility
Unlike WPF, which is limited to Windows, OpenSilver applications run natively in modern browsers, increasing reach and usability. - Cost Efficiency
Web-based applications reduce the need for client-side maintenance, enabling centralized updates and lower IT overhead. - Business Continuity
By modernizing legacy applications, organizations can future-proof their solutions against the uncertain future of WPF. - Enhanced Performance
OpenSilver applications leverage WebAssembly and HTML5, providing fast and secure web experiences without requiring browser plugins.
However, migrations can be complex and require careful planning. Among the risks are possible compatibility issues and redesigning certain application parts. In any case, the good support of WPF by OpenSilver mitigates many of these risks. The commitment of the OpenSilver team and the company leading its development and maintenance, Userware, to significantly enhance WPF support creates confidence that this complexity will be further reduced in 2025.
The Future of WPF and OpenSilver’s Role
Microsoft has confirmed continued support for WPF but has shifted its focus toward newer frameworks like MAUI. This uncertainty makes solutions like OpenSilver attractive for businesses seeking to preserve their WPF investments while embracing web technologies.
Use Cases for WPF-to-Web Migration
Here are some examples where migrating WPF applications to the Web can add much value:
- Enterprise Dashboards
A single-point access to analytics tools, not locked down to particular platforms. - Legacy ERP Systems
Modernized interfaces with better user experience and scalability. - Retail POS Systems
Browser-based solutions make deployments across many locations easier. - Healthcare Applications
Secure, web-based applications that share data in real-time and enable access from a distance.
OpenSilver’s Roadmap
Looking ahead, OpenSilver aims to deliver full WPF compatibility by mid-2025, supporting advanced features like triggers and styles. Other planned innovations include:
- MAUI Hybrid Integration
Enabling developers to mix native and web technologies across multiple platforms. - Blazor Interoperability
Combining Blazor components with XAML in the same project for greater flexibility. - 3D UI Support
Early previews of this feature are already available at XRSharp.io.
Key Takeaways About OpenSilver 3.1
OpenSilver 3.1 is announcing new opportunities for WPF developments. The inventive XAML Designer for VS Code, combined with the WPF on the web, plus future-proof features like .NET 9 compatibility, positions the framework to leverage developers in building rich web applications while protecting their XAML investment.
For more information or to play with the tools, refer to the OpenSilver website. You can start designing interfaces online. OpenSilver is open source and free; hence, it is ready for all the developers in the world.
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