Raw(!!) working OpenXML library code with creating Excel file and writing data

ConsoleApp1/Program.cs

@@ -9,47 +9,87 @@ using DocumentFormat.OpenXml.Spreadsheet;
 //using AutoMapper;
 using Microsoft.EntityFrameworkCore;
 using System;
+using System.IO;
+using System.Linq;
 
 namespace ConsoleApp1
 {
+    //var options = new DbContextOptionsBuilder<AsbCloudDbContext>()
+    //    .UseNpgsql("Host=localhost;Database=postgres;Username=postgres;Password=q;Persist Security Info=True")
+    //    .Options;
+    //var context = new AsbCloudDbContext(options);
+
     class Program
     {
 
         static void Main(/*string[] args*/)
         {
 
-            //var options = new DbContextOptionsBuilder<AsbCloudDbContext>()
-            //    .UseNpgsql("Host=localhost;Database=postgres;Username=postgres;Password=q;Persist Security Info=True")
-            //    .Options;
-            //var context = new AsbCloudDbContext(options);
+            // source files
+            using var firstExcel = SpreadsheetDocument.Open(@"D:\excels\excel1.xlsx", true);
+            using var secondExcel = SpreadsheetDocument.Open(@"D:\excels\excel2.xlsx", true);
 
-            var fileNames = new string[] { @"d:\temp\1\book1.xlsx", @"d:\temp\1\book2.xlsx" };
 
-            using var spreadsheetDocument = SpreadsheetDocument.Create(@"d:\temp\1\b.xlsx", SpreadsheetDocumentType.Workbook);
-            // Add a WorkbookPart and Workbook objects.  
-            WorkbookPart workbookpart = spreadsheetDocument.AddWorkbookPart();
-            workbookpart.Workbook = new Workbook();
 
-            // Add a WorksheetPart to the WorkbookPart.
-            WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
-            worksheetPart.Worksheet = new Worksheet(new SheetData());
-
-            // Add Sheets to the Workbook.
-            Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.
-                AppendChild<Sheets>(new Sheets());
-
-            // Append a new worksheet and associate it with the workbook.
-            Sheet sheet = new Sheet()
+            // init destination file
+            using var resultExcel = SpreadsheetDocument.Create(@"D:\excels\result.xlsx", SpreadsheetDocumentType.Workbook); 
+            WorkbookPart resultExcelWorkbookpart = resultExcel.AddWorkbookPart();
+            resultExcelWorkbookpart.Workbook = new Workbook
             {
-                Id = spreadsheetDocument.WorkbookPart.
-                    GetIdOfPart(worksheetPart),
-                SheetId = 1,
-                Name = "mySheetNameISHere!"
+                Sheets = new Sheets()
             };
-            sheets.Append(sheet);
+            var resultExcelWorksheetPart = resultExcelWorkbookpart.AddNewPart<WorksheetPart>();
+            resultExcelWorksheetPart.Worksheet = new Worksheet(new SheetData());
+            resultExcelWorkbookpart.Workbook.Save();
+            resultExcel.Close();
+
+
+            foreach (var sheet in firstExcel.WorkbookPart.Workbook.Descendants<Sheet>())
+            {
+                //resultExcel.WorkbookPart.Workbook.Sheets.Append(sheet.CloneNode(true)); // Clone empty sheet
+
+                var firstExcelWorkSheetPart = firstExcel.WorkbookPart.GetPartById(sheet.Id) as WorksheetPart; // get rows from source
+                var rows = firstExcelWorkSheetPart.Worksheet.Descendants<Row>(); // Rows
+
+            }
+
+
+
+            //resultExcel.Close();
+
+
+
+            using (var document = SpreadsheetDocument.Create(@"D:\excels\result123123.xlsx", SpreadsheetDocumentType.Workbook, true))
+            {
+                // Add a WorkbookPart to the document.
+                var workbookPart = document.AddWorkbookPart();
+                workbookPart.Workbook = new Workbook();
+
+                // Add a WorksheetPart to the WorkbookPart.
+                var worksheetPart1 = workbookPart.AddNewPart<WorksheetPart>();
+                worksheetPart1.Worksheet = new Worksheet();
+                var sheets = workbookPart.Workbook.AppendChild(new Sheets());
+
+
+                var sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart1), SheetId = 1, Name = "Test Sheet" };
+                sheets.Append(sheet);
+                workbookPart.Workbook.Save();
+            }
+
+            using (var document = SpreadsheetDocument.Open(@"D:\excels\result123123.xlsx", true))
+            {
+                var worksheetPart1 = document.WorkbookPart.WorksheetParts.First();
+                var sheetData1 = worksheetPart1.Worksheet.AppendChild(new SheetData());
+
+                for (uint i = 1; i < 10; i++)
+                {
+                    var row1 = new Row();
+                    row1.Append(new Cell { CellValue = new CellValue(i.ToString()) });
+                    sheetData1.AppendChild(row1);
+                }
+            }
+
 
-            spreadsheetDocument.Save();
-            spreadsheetDocument.Close();
 
             Console.WriteLine("Done. Press any key to quit.");
             Console.ReadKey();