creating-editor-taggers

To implement editor taggers, create an ITagger<T> to annotate text spans with tags like IErrorTag or IOutliningRegionTag, then expose them via a MEF-based ITaggerProvider to drive editor visuals in Visual Studio extensions.

ITagger<T> provides the tagging data for a given text buffer by annotating text spans, while ITaggerProvider is the MEF-based factory that instantiates taggers and exposes them to the Visual Studio editor framework for rendering visuals.

Yes, taggers can be implemented across out-of-process and in-process models, supporting VisualStudio.Extensibility, VSIX Community Toolkit, and VSSDK to generate editor visuals like error squiggles and text markers.

Implement ITagger<T> with TextMarkerTag for decorative highlights or IOutliningRegionTag for code folding, then wire the tagger to an ITaggerProvider to render the visual spans within your custom language tooling.

Supported tag types include IErrorTag for error squiggles, IOutliningRegionTag for code folding regions, and TextMarkerTag for decorative text markers, all driven through ITagger<T> implementations.

Yes, MEF-based exposure is required to wire ITaggerProvider implementations to the Visual Studio editor, ensuring the taggers are discovered and instantiated to supply tagging data for the text buffers.