Develop Reference

How can I create an Excel table using NPOI XSSF in C#?

I want to create a table in excel file using XSSFTable, after many research I can not do. The resources for 'NPOI in c#' on internet are very unique.
XSSFSheet sheet = (XSSFSheet)workbook.CreateSheet("Architecture");
XSSFTable table = sheet.CreateTable();
CT_Table cttable = table.GetCTTable();
cttable.displayName = "Table1";
cttable.id = 1;
cttable.name = "Test";
// cttable.setRef("A1:C11");
cttable.totalsRowShown = false;
that's what I found but I cannot complete it to insert data inside table .

EPPLUS ExcelRange creates table starting in wrong row

In C# I have populated an excel file with data. Now I would like to create a table starting at cell A2.
I am using the code below to create the table but instead of creating the table starting at Cell A2, the table is being created starting at cell A3
using var package = new ExcelPackage(file);
var ws = package.Workbook.Worksheets.Add(Name: "MainReport");
var range = ws.Cells[Address: "A2"].LoadFromCollection(people, PrintHeaders: true);
range.AutoFitColumns();
//Formats Header row
ws.Cells[Address: "A1"].Value = "My Data!";
ws.Cells[Address: "A1:C1"].Merge = true;
ws.Column(col: 1).Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
ws.Row(row: 1).Style.Font.Size = 24;
ws.Row(row: 1).Style.Font.Color.SetColor(Color.Pink);
ws.Row(row: 2).Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
ws.Row(row: 2).Style.Font.Bold = true;
ws.Column(col: 3).Width = 20;
//create a range for the table
ExcelRange range_table = ws.Cells[2, 1, ws.Dimension.End.Row, ws.Dimension.End.Column];
//add a table to the range
ExcelTable tab = ws.Tables.Add(range_table, "Table1");
//format the table
tab.TableStyle = TableStyles.Medium2;

Excel itself works so that if you select A2:C4 and create a table and you say "has no Headers" it will put some generic headers in A2:C2 and shift the data area (and the data if there is any) to A2:C5.
If you say "has Headers" the headers will be defined in A2:C2, too, but the data only is in A3:C4.
The real Excel obviously does some guessing whether headers are present or not and pre-ticks the box for you.
As stated here in the API Documentation, there is no flag to define if headers are present in the range so there might be no guessing and it might be assumed it is "no" and the shifting as explained on top takes place.
If you take that into consideration you should be able to work it out.

Activating Show Details for Grand Total of Pivot Table in C#

I'm trying to automate the creation of "Show Detail" of a Pivot Table from Excel using C#
using Excel = Microsoft.Office.Interop.Excel;
My code:
var excelApp = new Excel.Application();
excelApp.Visible = true;
Excel.Workbook workbook = excelApp.Workbooks.Open(#"D:\path_to_excel_file.xlsm");
Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets["Sheet_Name"];
Excel.PivotTable pivot = worksheet.PivotTables("defined_pivot_table_name");
pivot.DataBodyRange.ShowDetail = true;
The code works, but it displays only the details of the first "Total" value. But what I want is to get the "Show Details" of the "Grand Total".
In this case for this pivot table, it will create a new sheet with the 4 elements, but what I want is for the Grand Total (202).
I've tried selecting it first by pivot.PivotSelect("Grand Total"); but still no results. I've also checked pivot.RowGrand and pivot.ColumnGrand which both return True.

If your pivottable has both, RowGrand AND ColumnGrand, then it also has a grand total
if (pivot.RowGrand && pivot.ColumnGrand)
Then you can use the last cell of the pivottable's TableRange1 to generate the details by ShowDetail
int countRows = pivot.TableRange1.Rows.Count;
int countColumns = pivot.TableRange1.Columns.Count;
pivot.TableRange1.Cells[countRows, countColumns].ShowDetail = true;

Maybe this can help
// Access the pivot table by its name in the collection.
PivotTable pivotTable = worksheet.PivotTables["PivotTable1"];
// Access the pivot field by its name in the collection.
PivotField field = pivotTable.Fields["Category"];
// Display multiple subtotals for the field.
field.SetSubtotal(PivotSubtotalFunctions.Sum | PivotSubtotalFunctions.Average);
// Show all subtotals at the bottom of each group.
pivotTable.Layout.ShowAllSubtotals(false);
// Hide grand totals for rows.
pivotTable.Layout.ShowRowGrandTotals = False
// Hide grand totals for columns.
pivotTable.Layout.ShowColumnGrandTotals = False
// custom label for grand totals
pivotTable.View.GrandTotalCaption = "Total Sales";

Format vsto listobject before linked to datatable

I have a vsto application that populates an Excel sheet.
First I populate the datatable. The next function is to create a vsto listobject:
// Populate the sheet
XlsInterop.Excel.Worksheet worksheet = (XlsInterop.Excel.Worksheet)Globals.ThisAddIn.Application.ActiveWorkbook.Worksheets.Add();
extendedWorksheet = Globals.Factory.GetVstoObject(worksheet);
XlsInterop.Excel.Range cell = extendedWorksheet.Range["A1"];
excelItemsList = extendedWorksheet.Controls.AddListObject(cell, sheetName);
excelItemsList.AutoSetDataBoundColumnHeaders = true;
excelItemsList.DataSource = dt;
excelItemsList.ListColumns[5].Range.NumberFormat = "#";
Now the problem is that in column "5" I have values like 005, 004. In Excel, the values display as 5 and 4. How can I make sure that the values in Excel show the same values as in my database?
If I change my code like:
excelItemsList.SetDataBinding(dt);
excelItemsList.ListColumns[5].Range.NumberFormat = "#";
excelItemsList.SetDataBinding(dt);
It is doing what I want, but I don't think that this is the way to go.

If you know how many leading zeros you need, you can then format the column with that.
.NumberFormat = "000";
The column would then still be evaluated as a number.

Append data to excel sheet if created using ClosedXML in c#

I am writing an application in which I need to store data cell values into excel sheet. Everything is working fine but the problem is everytime I run the application, it overwrites the existing data.
So far the code I have taken from Github:
var workbook = new XLWorkbook();
var worksheet = workbook.Worksheets.Add("Sample Sheet");
worksheet.Cell("A1").Value = this.textBox1.Text;
worksheet.Cell("B1").Value = this.textBox2.Text;
worksheet.Cell("C1").Value = this.textBox3.Text;
worksheet.Cell("D1").Value = col1;
worksheet.Cell("E1").Value = col2;
worksheet.Cell("F1").Value = this.textBox6.Text;
workbook.SaveAs("HelloWorld.xlsx");
Note: I don't want to save data using datatable or anything. I just want to get values from textboxes and append them to the existing sheet. I have visited many stackoverflow post but they doesn't helped me much.
Thanks in advance!

Hope this helps:
var wb = new XLWorkbook("Path to file");
IXLWorksheet Worksheet = wb.Worksheet("Tab name");
int NumberOfLastRow = Worksheet.LastRowUsed().RowNumber();
IXLCell CellForNewData = Worksheet.Cell(NumberOfLastRow + 1, 1);
CellForNewData.InsertData(your_data);

You are explicitly storing the values in row 1 of the spreadsheet. If you want to append the values, you'll have to increment the row number and store the values in the appropriate cells.