TPL Dataflow (TDF) is a .NET library for building concurrent applications. It promotes actor/agent-oriented designs through primitives for in-process message passing, dataflow, and pipelining. TDF builds upon the TPL (Task Parallel Library) in .NET 4 and integrates with async language support in C#, Visual Basic, and F#. TDF lacks join/merge by key (like SSIS) and time-based windowing (available in Rx).
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