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04 — dynamic config → CSV (the dynamic path)

Defines a report entirely in report.json — no typed POCO. The JSON is parsed into a ReportConfig and compiled into the same runnable report the fluent builder produces; rows flow through the existing pipeline as positional ReportRecords.

dotnet run --project samples/04-dynamic-config-csv
# writes ./out/monthly-sales-<date>.csv

What the JSON drives today:

  • the report name and page size;
  • the source selection by id ("type": "inmemory") and its properties (rows);
  • the columns / schema: name, semantic type, header, format and culture;
  • the outputs and destinations selection by id ("csv", "local").

This sample keeps an in-memory source so it runs with no database. The real SQL config source now exists (A3): register it with services.AddSqlConfigSource() and change the source section to { "type": "sql", "properties": { "connectionString": "...", "sql": "...", "key": "Id" } } to read from SQL Server instead — nothing else in the config changes.

Still standing in: binding format/destination options from config arrives later (A5), so the CSV and Local factories are pre-wired in DI — the JSON's properties under outputs/destinations are illustrative for now.