1. André Rust
  2. PowerBuilder
  3. Thursday, 24 July 2025 12:51 PM UTC

Hi,

I have now tried to create a simple .NET Framework (4.8) version test example with ClosedXML in SnapDevelop. Then I tried to import the DLL using the .NET DLL Importer. Framework Type: .NET Framework

  1. Question: In Advanced Settings, does 'Encapsulate a DotNetAssembly' need to be activated? 

Then, select everything with 'select and preview' and import it.

 

C# Code (from the internet):

using System;

using System.IO;
using ClosedXML.Excel;

namespace PowerBuilderExcelUtil
{
    public class ExcelHelper
    {
        public ExcelHelper()
        {
            // none
        }

        public int CreateExcelWithData(string filePath, string sheetName, string[] headerRow, string[,] dataRows)
        {
            try
            {
                string directory = Path.GetDirectoryName(filePath);
                if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                using (var workbook = new XLWorkbook())
                {
                    var worksheet = workbook.Worksheets.Add(sheetName);

                    // Header schreiben
                    for (int col = 0; col < headerRow.Length; col++)
                    {
                        worksheet.Cell(1, col + 1).Value = headerRow[col];
                        worksheet.Cell(1, col + 1).Style.Font.Bold = true;
                        worksheet.Cell(1, col + 1).Style.Fill.BackgroundColor = XLColor.LightGray;
                    }

                    int numRows = dataRows.GetLength(0);
                    int numCols = dataRows.GetLength(1);

                    for (int row = 0; row < numRows; row++)
                    {
                        for (int col = 0; col < numCols; col++)
                        {
                            worksheet.Cell(row + 2, col + 1).Value = dataRows[row, col];
                        }
                    }

                    worksheet.Columns().AdjustToContents();

                    workbook.SaveAs(filePath);
                }
                Console.WriteLine($"C#: Excel-Datei mit Daten erfolgreich erstellt unter: {filePath}");
                return 0; // Erfolg
            }
            catch (Exception ex)
            {
                Console.Error.WriteLine($"C# Fehler beim Erstellen der Excel-Datei mit Daten: {ex.Message}");
                return -1; // Fehler
            }
        }
    }
}

Powerbuilder:

nvo_excelhelper lo_excel_helper

string ls_filepath
string ls_sheetname
string ls_cell_value
integer li_return_code

ls_filepath = "C:\temp\SimplePowerBuilderExcel.xlsx"
ls_sheetname = "FirstSheet"
ls_cell_value = "Hello PowerBuilder direct via .NET!" 

lo_excel_helper = CREATE nvo_excelhelper

IF IsValid(lo_excel_helper) THEN
    li_return_code = lo_excel_helper.of_CreateSimpleExcelFile(ls_filepath, ls_sheetname, ls_cell_value)

    IF li_return_code = 0 THEN
        MessageBox("Success", "Simple Excel file created under:~n" + ls_filepath)
    ELSE
        MessageBox("Error", "Error creating simple Excel file. Code: " + String(li_return_code) + "~nCheck the C# console window for details.")
    END IF

    DESTROY lo_excel_helper
ELSE
    MessageBox("Error", "Could not instantiate ExcelHelper object.~nEnsure that ALL C# DLLs are in the PB application directory.")
END IF

When I run the code in the debugger and it reaches the point with '....of_CreateExcelWithData...', I always get an error message.

The DLLs are in the directory where the PBW (PowerBuilder Workspace) is located.


Which DLLs do I need? Do they have to be in the PBW/PBT folder, or for an EXE, in the EXE's folder?

I don't know what to do next because I don't know what I did wrong, or what I can do differently.

Can anyone help me? e.g. with c# and PB code

Thanks André

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