For a deeper look into our Eikon Data API, look into:
Overview | Quickstart | Documentation | Downloads | Tutorials | Articles
There's a legacy Eikon .NET API providing access to real-time streaming market data and timeseries of price history. You can find the documentation and code samples here.
Eikon Data APIs, which currently provide access to fundamental & reference data, snapshots of current market data and limited timeseries of price history, can be used in .NET through an open source and not officially supported by TR library you can find here.