The cornerstone of VSTA 2015’s language support is its exclusive reliance on the .NET Framework 4.6. This decision fundamentally shapes its linguistic capabilities. Unlike its predecessor, VBA, which was a single-language environment, VSTA leverages the Common Language Runtime (CLR). Consequently, the supported languages—VB.NET and C#—are not merely distinct syntaxes; they are first-class citizens of the same managed execution environment. This allows developers to write macros, add-ins, and custom workflow activities in either language and have them interoperate seamlessly. A user could write a data transformation routine in VB.NET and call it from a UI automation script written in C# within the same host application, provided both compile to Intermediate Language (IL). This interoperability is a powerful feature, yet it is contingent on the two supported languages, reinforcing a pragmatic, curated ecosystem.
VSTA 2015 was released as part of the Visual Studio 2015 wave. Its primary role was to replace the aging VSTA 2012 and provide compatibility with the .NET Framework 4.6. Unlike the full Visual Studio IDE, VSTA is an isolated shell; it is stripped of compilers and language services by default. The host application (the software embedding VSTA) is responsible for configuring which languages are available to the user. The cornerstone of VSTA 2015’s language support is
Microsoft Visual Studio Tools for Applications 2015 provided a robust, mature, and powerful language support system tailored for enterprise customization. By anchoring itself in C# and VB.NET, it offered developers a strongly-typed, object-oriented alternative to the aging VBA. Its inclusion of C# 6.0 features brought the customization experience in line with modern development standards. Consequently, the supported languages—VB
A technical undercurrent of VSTA 2015 is its relationship with the .NET Compiler Platform, codenamed "Roslyn." Visual Studio 2015 was the first version to integrate Roslyn fully. While the full IDE utilized Roslyn for advanced refactoring and real-time diagnostics, the isolated shell used by VSTA had to accommodate these new compiler services to provide IntelliSense and syntax highlighting. This ensured that the language support was not merely a text editor, but a semantic-aware development environment. This interoperability is a powerful feature, yet it
A critical aspect of analyzing VSTA 2015 language support is recognizing its transitional nature. VSTA 2015 was effectively the last major version to support Visual Basic .NET as a first-class citizen in the customization sphere without significant architectural changes.