XlsxDiffEngine

XlsxDiffEngine is a simple C# library for comparing Excel (.xlsx) files. It provides powerful configuration options to customize data comparisons, allowing you to generate annotated output files that highlight all changes, additions, and removals. (For reading and writing Excel files, the EPPlus library is used.)

Features

• Flexible comparison options: Configure key columns, secondary key columns, ignored columns, group columns, text-only comparison columns, and more.
• Customizable data handling: Define data ranges, set merging options, add skip rules, apply modification rules, or manage individual requirements with callbacks.
• Visual change indicators: Highlight changes, additions, and deletions in the output using different cell styling and comment options.
• Configurable output: Customize headers, auto-fit columns, freeze panes, and apply auto-filters for enhanced readability.

Installation

Add XlsxDiffEngine to your project via NuGet:

Chriffizient.XlsxDiffEngine on NuGet

dotnet add package Chriffizient.XlsxDiffEngine

Getting Started

Basic Usage

Use the ExcelDiffBuilder to set up Excel files and key columns. Adjust other comparison options like value changed markers, ignored columns, modification rules, and styling preferences. Use the Build method to save an annotated comparison Excel output file.

Example

using XlsxDiffEngine;  
using OfficeOpenXml;  
  
new ExcelDiffBuilder()
    .AddFiles(x => x
        .SetOldFile(oldFileStream, "OldFile.xlsx")
        .SetNewFile(newFileStream, "NewFile.xlsx")
        )
    .SetKeyColumns("ID") // Optional
    .Build("ComparisonOutput.xlsx");

For more examples, take a look at the tests, or try out the functions via the XlsxDiffTool WPF application.