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Adds a new lightweight package Deedle.Excel.Reader that reads Excel
files (.xlsx and .xls) into Deedle frames without requiring Excel to
be installed. Built on the MIT-licensed ExcelDataReader library.
## New package: src/Deedle.Excel.Reader/
| File | Purpose |
|---|---|
| ExcelReader.fs | All public API |
| Deedle.Excel.Reader.fsproj | Project file (targets net9.0) |
| paket.references | Declares ExcelDataReader dependency |
## Public API
// Read first sheet (first row = headers)
Deedle.ExcelReader.readExcel : string -> Frame<int, string>
// Read sheet by name
Deedle.ExcelReader.readExcelSheet : string -> string -> Frame<int, string>
// Read sheet by zero-based index
Deedle.ExcelReader.readExcelSheetByIndex : string -> int -> Frame<int, string>
// List all sheet names
Deedle.ExcelReader.sheetNames : string -> string list
## Tests: tests/Deedle.Excel.Reader.Tests/
13 tests covering:
- Row / column count
- Column names (headers)
- String, integer and float values
- sheetNames utility
- Named sheet access
- Indexed sheet access
- Error handling (unknown name, out-of-range index)
- Missing values (empty cells become OptionalValue.Missing)
## New dependency
ExcelDataReader 3.8 + ExcelDataReader.DataSet 3.8 (MIT, ExcelDataReader project).
No new transitive dependencies beyond System.*.
## Test status
Passed! - Failed: 0, Passed: 13, Skipped: 0, Total: 13 (Deedle.Excel.Reader.Tests)
Passed! - Failed: 0, Passed: 685, Skipped: 0, Total: 685 (Deedle.Tests – no regressions)
Closes #429
Co-authored-by: Copilot <[email protected]>
dsyme
approved these changes
Mar 19, 2026
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🤖 This PR was created by Repo Assist in response to issue #429.
Summary
This PR adds a new lightweight
Deedle.Excel.Readerpackage that reads Excel files (.xlsxand.xls) into Deedle frames cross-platform without requiring Microsoft Excel to be installed. It is built on top of the MIT-licensed ExcelDataReader library.The existing
Deedle.Excelpackage (COM/NetOffice) continues to exist for interactive write-to-live-Excel workflows; this new package complements it for file-based reading.What's included
src/Deedle.Excel.Reader/ExcelReader.fsDeedle.Excel.Reader.fsprojnet9.0)paket.referencesExcelDataReader+ExcelDataReader.DataSetdependencytests/Deedle.Excel.Reader.Tests/13 tests covering:
sheetNamesutilityOptionalValue.Missing)Public API
Closes #429