كيفية مقارنة ملفات Excel في .NET

dotnet add package GroupDocs.Comparison --version 25.4.0

using GroupDocs.Comparison;
using System;
using System.IO;

string documentDirectory = "YOUR_DOCUMENT_DIRECTORY";
string resultOutputDirectory = "YOUR_OUTPUT_DIRECTORY";

string sourceFilePath = Path.Combine(documentDirectory, "source_cells.xlsx");
string targetFilePath = Path.Combine(documentDirectory, "target_cells.xlsx");
string resultFilePath = Path.Combine(resultOutputDirectory, "comparison_result.xlsx");

using (Comparer comparer = new Comparer(sourceFilePath))
{
    // Add target file for comparison
    comparer.Add(targetFilePath);
}

using (Comparer comparer = new Comparer(sourceFilePath))
{
    comparer.Add(targetFilePath);
    // Compare and save results
    comparer.Compare(resultFilePath);
}

using GroupDocs.Comparison;
using System;
using System.IO;

class Program
{
    static Main()
    {
        try
        {
            // Set up file paths
            string documentDirectory = @"C:\TestFiles";
            string outputDirectory = @"C:\ComparisonResults";
            
            string sourceFile = Path.Combine(documentDirectory, "quarterly_report_v1.xlsx");
            string targetFile = Path.Combine(documentDirectory, "quarterly_report_v2.xlsx");
            string resultFile = Path.Combine(outputDirectory, "comparison_result.xlsx");
            
            // Ensure output directory exists
            Directory.CreateDirectory(outputDirectory);
            
            // Perform comparison
            using (Comparer comparer = new Comparer(sourceFile))
            {
                comparer.Add(targetFile);
                comparer.Compare(resultFile);
            }
            
            Console.WriteLine($"Comparison complete! Results saved to: {resultFile}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error during comparison: {ex.Message}");
        }
    }
}

using (Comparer comparer = new Comparer(sourceFilePath))
{
    comparer.Add(targetFilePath);
    
    // Configure comparison options
    CompareOptions options = new CompareOptions()
    {
        ShowRevisions = true,
        DetectStyleChanges = true,
        GenerateSummaryPage = true
    };
    
    comparer.Compare(resultFilePath, options);
}

using (Comparer comparer = new Comparer(sourceFilePath))
{
    comparer.Add(targetFile1Path);
    comparer.Add(targetFile2Path);
    comparer.Add(targetFile3Path);
    
    comparer.Compare(resultFilePath);
}

public class FinancialReportValidator
{
    public bool ValidateReportChanges(string previousReport, string currentReport)
    {
        string comparisonResult = Path.GetTempFileName() + ".xlsx";
        
        using (Comparer comparer = new Comparer(previousReport))
        {
            comparer.Add(currentReport);
            comparer.Compare(comparisonResult);
            
            // Check if there are significant changes
            return HasSignificantChanges(comparisonResult);
        }
    }
    
    private bool HasSignificantChanges(string comparisonFile)
    {
        // Your business logic here
        // For example, check if revenue columns changed by more than 5%
        return false;
    }
}

public class DataMigrationValidator
{
    public async Task<bool> VerifyMigration(string sourceData, string migratedData)
    {
        try
        {
            string resultPath = $"migration_validation_{DateTime.Now:yyyyMMdd_HHmmss}.xlsx";
            
            using (Comparer comparer = new Comparer(sourceData))
            {
                comparer.Add(migratedData);
                comparer.Compare(resultPath);
            }
            
            // Send result to stakeholders
            await NotifyStakeholders(resultPath);
            return true;
        }
        catch (Exception ex)
        {
            // Log error and handle gracefully
            Console.WriteLine($"Migration validation failed: {ex.Message}");
            return false;
        }
    }
}

// Good practice
using (Comparer comparer = new Comparer(sourceFilePath))
{
    // Your comparison logic
}

// Check if file is in use before comparison
private bool IsFileLocked(string filePath)
{
    try
    {
        using (FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.None))
        {
            return false;
        }
    }
    catch (IOException)
    {
        return true;
    }
}

// Process files in chunks or limit comparison scope
CompareOptions options = new CompareOptions()
{
    // Only compare content, skip formatting for speed
    DetectStyleChanges = false,
    
    // Limit comparison to specific ranges if possible
    // Note: Range limitation may require custom implementation
};

public void CompareFilesWithMemoryManagement(string source, string target, string output)
{
    // Ensure garbage collection
    GC.Collect();
    GC.WaitForPendingFinalizers();
    
    using (Comparer comparer = new Comparer(source))
    {
        comparer.Add(target);
        comparer.Compare(output);
    }
    
    // Force cleanup
    GC.Collect();
}

// Optimize for speed
CompareOptions fastOptions = new CompareOptions()
{
    DetectStyleChanges = false,        // Skip formatting comparison
    ShowRevisions = false,             // Skip revision tracking
    GenerateSummaryPage = false        // Skip summary generation
};

public async Task CompareMultipleFilePairs(List<(string source, string target)> filePairs)
{
    foreach (var (source, target) in filePairs)
    {
        string output = $"comparison_{Path.GetFileNameWithoutExtension(source)}.xlsx";
        
        using (Comparer comparer = new Comparer(source))
        {
            comparer.Add(target);
            comparer.Compare(output);
        }
        
        // Small delay to prevent resource exhaustion
        await Task.Delay(100);
    }
}

[ApiController]
[Route("api/[controller]")]
public class ExcelComparisonController : ControllerBase
{
    [HttpPost("compare")]
    public async Task<IActionResult> CompareExcelFiles(IFormFile sourceFile, IFormFile targetFile)
    {
        if (sourceFile == null || targetFile == null)
            return BadRequest("Both source and target files are required.");
        
        try
        {
            // Save uploaded files temporarily
            string tempDir = Path.GetTempPath();
            string sourcePath = Path.Combine(tempDir, sourceFile.FileName);
            string targetPath = Path.Combine(tempDir, targetFile.FileName);
            string resultPath = Path.Combine(tempDir, $"comparison_{Guid.NewGuid()}.xlsx");
            
            using (var sourceStream = new FileStream(sourcePath, FileMode.Create))
            {
                await sourceFile.CopyToAsync(sourceStream);
            }
            
            using (var targetStream = new FileStream(targetPath, FileMode.Create))
            {
                await targetFile.CopyToAsync(targetStream);
            }
            
            // Perform comparison
            using (Comparer comparer = new Comparer(sourcePath))
            {
                comparer.Add(targetPath);
                comparer.Compare(resultPath);
            }
            
            // Return result file
            var resultBytes = await System.IO.File.ReadAllBytesAsync(resultPath);
            
            // Cleanup temporary files
            System.IO.File.Delete(sourcePath);
            System.IO.File.Delete(targetPath);
            System.IO.File.Delete(resultPath);
            
            return File(resultBytes, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "comparison_result.xlsx");
        }
        catch (Exception ex)
        {
            return StatusCode(500, $"Comparison failed: {ex.Message}");
        }
    }
}