List Of Object To Excel File

Author: PrashantUnity

content/blog/general/listToExcel.md

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+---
+title: "2024"
+author: "PrashantUnity"
+weight: 115
+date: 2025-03-14
+lastmod: 2025-03-14
+dateString: March 2025  
+description: "Generate multi-sheet Excel files in C sharp using OpenXML"
+#canonicalURL: "https://canonical.url/to/page"
+cover:
+    image: "cover.jpg" # image path/url
+    alt: "Download Logo" # alt text
+    #caption: "Optical Character Recognition"  display caption under cover 
+
+tags: [ "NET", "codefrydev", "C sharp", "CFD", "Excel","List"]
+keywords: [ "NET", "codefrydev", "C sharp", "CFD"]
+hideMeta: true
+---
+
+# Creating Excel File from List<T> With Different Sheet With Naming
+
+> nuget package used [OpenXML](https://github.com/dotnet/Open-XML-SDK?tab=readme-ov-file#documentation)
+```cs
+public static MemoryStream WriteMultipleListsToExcel_OpenXml(params (string sheetName, IEnumerable<object> list)[] sections)
+{
+   
+    var memoryStream = new MemoryStream();
+
+    using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook))
+    {
+        var workbookPart = spreadsheetDocument.AddWorkbookPart();
+        workbookPart.Workbook = new Workbook();
+
+        var workbookProps = new WorkbookProperties() { DefaultThemeVersion = 124226 }; // Ensure workbook properties
+        workbookPart.Workbook.AppendChild(workbookProps);
+
+        var sheets = workbookPart.Workbook.AppendChild(new Sheets());
+
+        uint sheetId = 1;
+
+        foreach (var (sheetName, list) in sections)
+        {
+            var worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
+            worksheetPart.Worksheet = new Worksheet(new SheetData());
+
+            var sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart), SheetId = sheetId++, Name = sheetName };
+            sheets.Append(sheet);
+
+            var sheetData = worksheetPart.Worksheet.GetFirstChild<SheetData>();
+            var type = list.GetType().GetGenericArguments()[0];
+            var properties = type.GetProperties();
+
+            // Add header row
+            var headerRow = new Row();
+            foreach (var prop in properties)
+            {
+                headerRow.Append(CreateTextCell(prop.Name));
+            }
+            sheetData.Append(headerRow);
+
+            // Add data rows
+            foreach (var item in list)
+            {
+                var dataRow = new Row();
+                foreach (var prop in properties)
+                {
+                    var value = prop.GetValue(item)?.ToString() ?? string.Empty;
+                    dataRow.Append(CreateTextCell(value));
+                }
+                sheetData.Append(dataRow);
+            }
+
+            worksheetPart.Worksheet.Save();
+        }
+
+        workbookPart.Workbook.Save();
+    }
+
+    memoryStream.Position = 0;
+    return memoryStream;
+}
+private static Cell CreateTextCell(string value)
+{
+    return new Cell
+    {
+        CellValue = new CellValue(value),
+        DataType = CellValues.String
+    };
+}
+```
+
+## Use of Above Function
+
+> lets Suppose we have Below Class
+
+```cs
+public class Person
+{
+    public string Name { get; set; }
+    public int Age { get; set; }
+}
+
+public class Product
+{
+    public string Name { get; set; }
+    public decimal Price { get; set; }
+}
+
+public class Order
+{
+    public int OrderId { get; set; }
+    public decimal Amount { get; set; }
+}
+```
+
+> Calling the function
+
+```cs
+var people = new List<Person>
+{
+    new Person { Name = "John", Age = 30 },
+    new Person { Name = "Jane", Age = 25 }
+};
+
+var products = new List<Product>
+{
+    new Product { Name = "Laptop", Price = 1200 },
+    new Product { Name = "Phone", Price = 800 }
+};
+
+var orders = new List<Order>
+{
+};
+
+var memoryStream = WriteMultipleListsToExcel_OpenXml(("People", people), ("Products", products), ("Orders", orders));
+
+File.WriteAllBytes("combined_data_openxml.xlsx", memoryStream.ToArray());
+Console.WriteLine("Excel file created successfully using OpenXML!");
+```