EPPlusSoftware/EPPlus
Nov 2024 – Aug 2025
8 Months active
Languages Used
C#
Technical Skills
Excel AutomationPivot Table ConfigurationSoftware DevelopmentUnit TestingAPI DesignFile Handling
AdrianParnéus
PROFILE
Adrianparnéus
Worked on the EPPlus repository to deliver new features and reliability improvements for Excel automation and file handling in C#. Over eight months, contributed enhancements such as embedded OLE object support, expanded PivotTable configuration, and culture-aware formatting, while also addressing bugs related to image duplication, null references, and XML save order. Applied skills in API design, XML manipulation, and unit testing to stabilize OLE object workflows, improve test coverage, and streamline code through refactoring and documentation cleanup. The work focused on reducing regressions, supporting complex Excel scenarios, and ensuring robust, maintainable solutions for enterprise-grade spreadsheet processing and reporting.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
22Total
Bugs
6
Commits
22
Features
6
Lines of code
4,920
Activity Months8
Your Network
9 peopleSame Organization
@epplussoftware.com3
Work History
August 2025
1 Commits
Aug 1, 2025Month: 2025-08. Focused on stability improvements and culture-aware formatting for EPPlus. Delivered a critical fix for a null reference when using Worksheet objects, and added a regression test to ensure correct formatting under German culture settings. These changes reduce runtime errors and prevent locale-specific formatting issues, improving reliability for business users across regions.
1 Commits
Aug 1, 2025Month: 2025-08. Focused on stability improvements and culture-aware formatting for EPPlus. Delivered a critical fix for a null reference when using Worksheet objects, and added a regression test to ensure correct formatting under German culture settings. These changes reduce runtime errors and prevent locale-specific formatting issues, improving reliability for business users across regions.
August 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Consolidated focus on improving test coverage and data integrity for EPPlus. Delivered a targeted enhancement to the legacy test suite to validate worksheet data handling for issue s880, ensuring robust data setup and cleanup prior to package save.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Consolidated focus on improving test coverage and data integrity for EPPlus. Delivered a targeted enhancement to the legacy test suite to validate worksheet data handling for issue s880, ensuring robust data setup and cleanup prior to package save.
May 2025
1 Commits • 1 Features
May 1, 2025In May 2025, EPPlus delivered a reliability-focused refinement to the workbook XML save process. The save workflow was restructured so workbookXml is saved at the correct stage, improving operation order and reducing the risk of failures during save. The change is captured in commit 00224df26bbacce665d0a2cd64f82e261e1062bb with message 'moved saving workbookXml in save.' This work enhances stability for end users saving large or complex workbooks, and sets a foundation for easier future enhancements. Technologies/skills demonstrated: C#, XML handling, code refactoring, maintainability improvements, and a disciplined commit-driven workflow.
1 Commits • 1 Features
May 1, 2025In May 2025, EPPlus delivered a reliability-focused refinement to the workbook XML save process. The save workflow was restructured so workbookXml is saved at the correct stage, improving operation order and reducing the risk of failures during save. The change is captured in commit 00224df26bbacce665d0a2cd64f82e261e1062bb with message 'moved saving workbookXml in save.' This work enhances stability for end users saving large or complex workbooks, and sets a foundation for easier future enhancements. Technologies/skills demonstrated: C#, XML handling, code refactoring, maintainability improvements, and a disciplined commit-driven workflow.
May 2025
March 2025
3 Commits • 1 Features
Mar 1, 2025March 2025: EPPlus delivered targeted reliability improvements and code quality enhancements. Key bug fixes improve accuracy and stability of Excel file generation with embedded images, while a focused test-cleanup reinforces maintainability. This work reduces the risk of duplicate images when loading OLE objects and prevents incorrect _toRow tracking after multiple picture insertions, contributing to more predictable behavior in Excel file generation.
March 2025
3 Commits • 1 Features
Mar 1, 2025March 2025: EPPlus delivered targeted reliability improvements and code quality enhancements. Key bug fixes improve accuracy and stability of Excel file generation with embedded images, while a focused test-cleanup reinforces maintainability. This work reduces the risk of duplicate images when loading OLE objects and prevents incorrect _toRow tracking after multiple picture insertions, contributing to more predictable behavior in Excel file generation.
February 2025
4 Commits • 1 Features
Feb 1, 2025February 2025: Delivered Embedded OLE Objects support for Excel (XLSX) in EPPlus, enabling embedding, linking, and management of entire Excel workbooks within XLSX files. Implemented reliability improvements including correct XML for OLE links, ProgId validation, and robust saving/updating behavior for linked embedded objects to support stable enterprise document workflows.
4 Commits • 1 Features
Feb 1, 2025February 2025: Delivered Embedded OLE Objects support for Excel (XLSX) in EPPlus, enabling embedding, linking, and management of entire Excel workbooks within XLSX files. Implemented reliability improvements including correct XML for OLE links, ProgId validation, and robust saving/updating behavior for linked embedded objects to support stable enterprise document workflows.
February 2025
January 2025
7 Commits
Jan 1, 2025January 2025 – EPPlus (EPPlusSoftware/EPPlus): Delivered stabilization of Excel OLE object handling with a broad set of bug fixes and improvements across copy behavior, external link indexing, XML namespace consistency, and anchor handling. These changes significantly reduce OLE-related regressions in Excel file processing, improve downstream compatibility, and enhance maintainability through code cleanup and test stabilization. Commit activity documents progress across copy fixes, indexing, namespace normalization, and test-related cleanups, establishing a stronger foundation for reliable OLE support in customer workflows.
January 2025
7 Commits
Jan 1, 2025January 2025 – EPPlus (EPPlusSoftware/EPPlus): Delivered stabilization of Excel OLE object handling with a broad set of bug fixes and improvements across copy behavior, external link indexing, XML namespace consistency, and anchor handling. These changes significantly reduce OLE-related regressions in Excel file processing, improve downstream compatibility, and enhance maintainability through code cleanup and test stabilization. Commit activity documents progress across copy fixes, indexing, namespace normalization, and test-related cleanups, establishing a stronger foundation for reliable OLE support in customer workflows.
December 2024
3 Commits • 1 Features
Dec 1, 2024Month: 2024-12. Focused on stabilizing and expanding OLE object support while improving test reliability for EPPlus. Key outcomes include introduction of OleObject casting and a type system, groundwork for SaveExternalLink, and XML synchronization improvements for OleObjects, complemented by corrected test expectations for SetAdjustmentPoint and styling. These changes reduce risk in embedding features and accelerate readiness for future external-link capabilities, delivering business value through more reliable tests and richer object handling.
3 Commits • 1 Features
Dec 1, 2024Month: 2024-12. Focused on stabilizing and expanding OLE object support while improving test reliability for EPPlus. Key outcomes include introduction of OleObject casting and a type system, groundwork for SaveExternalLink, and XML synchronization improvements for OleObjects, complemented by corrected test expectations for SetAdjustmentPoint and styling. These changes reduce risk in embedding features and accelerate readiness for future external-link capabilities, delivering business value through more reliable tests and richer object handling.
December 2024
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary focused on delivering reliability improvements and feature enhancements in EPPlus (EPPlusSoftware/EPPlus). The work improved test discovery reliability and expanded PivotTable display capabilities, directly contributing to product stability and user value for Excel-based reporting.
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary focused on delivering reliability improvements and feature enhancements in EPPlus (EPPlusSoftware/EPPlus). The work improved test discovery reliability and expanded PivotTable display capabilities, directly contributing to product stability and user value for Excel-based reporting.
Activity
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Quality Metrics
Correctness88.6%
Maintainability86.0%
Architecture83.2%
Performance77.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
C#
Technical Skills
API DesignBug FixingCode CleanupCode RefactoringDocumentation ManagementError HandlingExcel AutomationExcel File Format (Open XML)File HandlingFile I/OLibrary DevelopmentObject Linking and Embedding (OLE)Object-Oriented ProgrammingOffice Open XMLPivot Table Configuration
Repositories Contributed To
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