# reactivemarbles/DynamicData

Reactive collections based on Rx.Net

Repository: https://github.com/reactivemarbles/DynamicData
Canonical: https://ross.abutalabs.com/products/dynamicdata
Language: C#
License: MIT
License Family: permissive
Topics: reactive-extensions, reactive-collections, rx, dynamic-data, rx-observable, dotnet, csharp, mvvm, reactive-programming, dynamicdata, reactivex, hacktoberfest
Last push: 2026-08-24T20:11:50+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 90, longevity 100
- inputs: {"age_days": 4303, "days_push": 9, "days_rel": 64, "gap_med": 24.5, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1897, forks 193 (observed 2026-08-28T04:05:51.066296+00:00)

## What it is
Dynamic Data is a .NET library that brings Reactive Extensions (Rx) to in-memory collections. It provides SourceCache and SourceList data sources plus 60+ operators to declaratively filter, sort, group, join, transform, and bind dynamically updating collections.

## Use cases
- keep a UI collection in sync with asynchronous updates
- filter and sort a live data source reactively
- group and join multiple observable collections
- bind observable collections to WPF or Avalonia MVVM views
- manage collection disposal and expiration reactively
- paginate or virtualize large reactive data sets

## When to choose
- you build .NET MVVM apps with collections that change over time
- you already use Rx.NET and need collection management operators
- you want declarative pipelines instead of manual collection mutation code

## When to avoid
- your collections are static and rarely change
- you work outside the .NET ecosystem
- you prefer simple imperative collection code without Rx complexity

## Facets
- artifact type: library
- maturity: active
- function: state-management, developer-tools
- domain: developer-tools, cross-platform
- platform: dotnet, cross-platform
- tags: reactive-extensions, rx, collections, mvvm, csharp, source-cache, source-list, dotnet, reactive-programming

## Member repositories
- reactivemarbles/DynamicData (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:51.066296+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:12:48.813713+00:00, confidence not recorded.
  - readme: https://github.com/reactivemarbles/DynamicData (fetched 2026-08-28T04:05:51.066296+00:00, sha 18d3da6019af)
- Data as of 2026-08-30T08:39:29.467469+00:00.