fix: Dynamic XML namespace prefixes for consistent Excel files

[TeaJAge]

Summary by CodeRabbit

• Refactor
  • Enhanced internal worksheet XML serialization with dynamic namespace prefix handling to ensure proper namespace-aware output during file save operations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The change modifies EPPlus/ExcelWorksheet.cs to introduce dynamic XML namespace prefix handling for worksheet serialization. A private field _nsPrefix is populated from the document's root namespace prefix and used across multiple serialization methods to generate properly prefixed XML tags. A Regex alias is added and using statements are reorganized.

Changes

Cohort / File(s)	Summary
XML Namespace-Aware Serialization EPPlus/ExcelWorksheet.cs	Introduces private field _nsPrefix to store dynamic namespace prefix from worksheet XML document. Updates tag writes in serialization methods (UpdateMergedCells, UpdateColBreaks, UpdateRowBreaks, UpdateColumnData, UpdateRowCellData, UpdateHyperLinks, etc.) to use prefixed element names. Adds Regex alias for internal parsing. Reorganizes using statements to include additional references.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• The changes span multiple serialization methods but follow a consistent pattern of prefix-aware tag generation
• Requires verification that namespace prefix handling is applied correctly and consistently across all XML output paths
• Attention needed to ensure conditional prefix inclusion/omission logic doesn't break XML output for worksheets with or without namespace prefixes
• Verify that the Regex alias refactoring does not introduce behavioral changes in parsing logic

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 38.46% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: introducing dynamic XML namespace prefix handling for worksheet serialization to ensure consistent Excel file output.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (1)

EPPlus/ExcelWorksheet.cs (1)

3440-3449: Translate comment to English for consistency.

The comment on line 3440 is in German. For codebase consistency and maintainability, it should be in English.

Suggested fix

-            // Ermittle den Namespace-Prefix aus dem Dokument
+            // Determine the namespace prefix from the document
             var worksheetNode = _worksheetXml.DocumentElement;

📜 Review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9428edb and 5a745df.

📒 Files selected for processing (1)

• EPPlus/ExcelWorksheet.cs (27 hunks)

🔇 Additional comments (6)

EPPlus/ExcelWorksheet.cs (6)

58-58: LGTM!

The RegexMatch alias is a clean approach to avoid naming conflicts while maintaining code clarity.

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375-375: LGTM!

The field is correctly initialized with an empty string default, ensuring consistent behavior for both prefixed and non-prefixed XML output.

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1465-1472: LGTM!

The namespace prefix is correctly applied to the merged cells XML elements. The formatting with string interpolation is clean and readable.

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3653-3653: LGTM!

The namespace prefix is consistently applied to all sheetData elements and closing tags. The string interpolation pattern $"<{_nsPrefix}sheetData>" correctly handles both prefixed and non-prefixed XML output.

Also applies to: 3784-3785

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4064-4064: LGTM!

The namespace prefix is correctly integrated into all hyperlink XML elements while preserving the existing logic for handling internal and external hyperlinks.

Also applies to: 4073-4074, 4097-4102, 4110-4110

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3873-3873: LGTM!

The namespace prefix is correctly applied to value elements while preserving the existing XML escaping logic.

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Search for "RefAndLookup" references in ExcelWorksheet.cs
rg -n "RefAndLookup" EPPlus/ExcelWorksheet.cs || echo "No RefAndLookup found in ExcelWorksheet.cs"

# Also check what types might be imported from that namespace
rg -n "Index\|VLookup\|Lookup\|Offset" EPPlus/ExcelWorksheet.cs | head -20 || echo "No common RefAndLookup types found"

Repository: Shane32/EPPlus

Length of output: 125

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Remove unused import at line 39.

The OfficeOpenXml.FormulaParsing.Excel.Functions.RefAndLookup namespace is imported but not referenced anywhere in the file. Remove it to keep imports clean.

🤖 Prompt for AI Agents

In EPPlus/ExcelWorksheet.cs around line 39, the using directive
"OfficeOpenXml.FormulaParsing.Excel.Functions.RefAndLookup" is unused; remove
that import line to clean up unused namespaces and then save the file
(optionally run a build or linter to confirm no other references remain).