Excel Import and Export Using EPPlus in .Net

Thu, 03 Sep 2020 00:00:00 +0000

EPPlus GitHub Repository: https://github.com/EPPlusSoftware/EPPlus

Add the EPPlus package to your project:

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Install-Package EPPlus

📥 Excel Import Example

Read data from an Excel file and serialize it into JSON.

Sample Excel Structure:

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| AAA | BBB | CCC | DDD | EEE | FFF |
|-----|-----|-----|-----|-----|-----|
| A1 | B1 | C1 | D1 | E1 | F1 |
| A2 | B2 | C2 | D2 | E2 | F2 |

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[HttpPost]
public List<ExcelDemoDto> Import([FromForm] ImportExcelInput input)
{
 var list = new List<ExcelDemoDto>();

 using (var package = new ExcelPackage(input.ExcelFile.OpenReadStream()))
 {
 var sheet = package.Workbook.Worksheets.First();

 int startRow = sheet.Dimension.Start.Row + 1;
 int endRow = sheet.Dimension.End.Row;

 for (int row = startRow; row <= endRow; row++)
 {
 list.Add(new ExcelDemoDto
 {
 AAA = sheet.Cells[row, 1].Text,
 BBB = sheet.Cells[row, 2].Text,
 CCC = sheet.Cells[row, 3].Text,
 DDD = sheet.Cells[row, 4].Text,
 EEE = sheet.Cells[row, 5].Text,
 FFF = sheet.Cells[row, 6].Text
 });
 }
 }
 return list;
}

// DTO Class
public class ExcelDemoDto
{
 public string AAA { get; set; }
 public string BBB { get; set; }
 public string CCC { get; set; }
 public string DDD { get; set; }
 public string EEE { get; set; }
 public string FFF { get; set; }
}

// Input Model
public class ImportExcelInput
{
 public IFormFile ExcelFile { get; set; }
}

JSON Output Example:

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[
 {"AAA":"A1","BBB":"B1","CCC":"C1","DDD":"D1","EEE":"E1","FFF":"F1"},
 {"AAA":"A2","BBB":"B2","CCC":"C2","DDD":"D2","EEE":"E2","FFF":"F2"}
]

📤 Excel Export Example

Generate an Excel file with mock data and save it locally.

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[HttpGet]
public async Task<string> Export()
{
 using var package = new ExcelPackage();
 var worksheet = package.Workbook.Worksheets.Add("Sheet1");

 // Set headers
 string[] headers = { "AAA", "BBB", "CCC", "DDD", "EEE", "FFF" };
 for (int i = 0; i < headers.Length; i++)
 {
 worksheet.Cells[1, i + 1].Value = headers[i];
 worksheet.Cells[1, i + 1].Style.Font.Bold = true;
 }

 // Mock data
 var data = Enumerable.Range(1, 10).Select(i => new ExcelDemoDto
 {
 AAA = $"A{i}", BBB = $"B{i}", CCC = $"C{i}",
 DDD = $"D{i}", EEE = $"E{i}", FFF = $"F{i}"
 }).ToList();

 // Populate data
 int row = 2;
 foreach (var item in data)
 {
 worksheet.Cells[row, 1].Value = item.AAA;
 worksheet.Cells[row, 2].Value = item.BBB;
 worksheet.Cells[row, 3].Value = item.CCC;
 worksheet.Cells[row, 4].Value = item.DDD;
 worksheet.Cells[row, 5].Value = item.EEE;
 worksheet.Cells[row, 6].Value = item.FFF;
 row++;
 }

 // Save file
 string path = Path.Combine(Directory.GetCurrentDirectory(), "export.xlsx");
 await package.GetAsByteArray().DownloadAsync(path);
 return $"File saved to: {path}";
}

Exported Excel Preview:

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Bold headers: AAA | BBB | CCC | DDD | EEE | FFF
Row 2: A1 | B1 | C1 | D1 | E1 | F1
...
Row 11: A10 | B10 | C10 | D10 | E10 | F10

Key features demonstrated:

Stream-based Excel file handling
Dynamic row/column detection
Header styling (bold text)
File export to local storage
Compatibility with ASP.NET Core file uploads

Excel on Allen's Dev Journal

Excel Import and Export Using EPPlus in .Net

📥 Excel Import Example

📤 Excel Export Example