Erstellen, Lesen und Bearbeiten von Excel-Dateien in .NET MAUI

private void CreateExcel(object sender, EventArgs e)
{
    // Create a new Workbook
    WorkBook workbook = WorkBook.Create(ExcelFileFormat.XLSX);

    // Create a Worksheet
    var sheet = workbook.CreateWorkSheet("2022 Budget");

    // Set cell headers
    sheet["A1"].Value = "January";
    sheet["B1"].Value = "February";
    sheet["C1"].Value = "March";
    sheet["D1"].Value = "April";
    sheet["E1"].Value = "May";
    sheet["F1"].Value = "June";
    sheet["G1"].Value = "July";
    sheet["H1"].Value = "August";

    // Fill worksheet cells with random values
    Random r = new Random();
    for (int i = 2; i <= 11; i++)
    {
        sheet["A" + i].Value = r.Next(1, 1000);
        sheet["B" + i].Value = r.Next(1000, 2000);
        sheet["C" + i].Value = r.Next(2000, 3000);
        sheet["D" + i].Value = r.Next(3000, 4000);
        sheet["E" + i].Value = r.Next(4000, 5000);
        sheet["F" + i].Value = r.Next(5000, 6000);
        sheet["G" + i].Value = r.Next(6000, 7000);
        sheet["H" + i].Value = r.Next(7000, 8000);
    }

    // Apply formatting (background and border)
    sheet["A1:H1"].Style.SetBackgroundColor("#d3d3d3");
    sheet["A1:H1"].Style.TopBorder.SetColor("#000000");
    sheet["A1:H1"].Style.BottomBorder.SetColor("#000000");
    sheet["H2:H11"].Style.RightBorder.SetColor("#000000");
    sheet["H2:H11"].Style.RightBorder.Type = IronXL.Styles.BorderType.Medium;
    sheet["A11:H11"].Style.BottomBorder.SetColor("#000000");
    sheet["A11:H11"].Style.BottomBorder.Type = IronXL.Styles.BorderType.Medium;

    // Apply formulas
    decimal sum = sheet["A2:A11"].Sum();
    decimal avg = sheet["B2:B11"].Avg();
    decimal max = sheet["C2:C11"].Max();
    decimal min = sheet["D2:D11"].Min();

    sheet["A12"].Value = "Sum";
    sheet["B12"].Value = sum;

    sheet["C12"].Value = "Avg";
    sheet["D12"].Value = avg;

    sheet["E12"].Value = "Max";
    sheet["F12"].Value = max;

    sheet["G12"].Value = "Min";
    sheet["H12"].Value = min;

    // Save and open the Excel file
    SaveService saveService = new SaveService();
    saveService.SaveAndView("Budget.xlsx", "application/octet-stream", workbook.ToStream());
}

private void CreateExcel(object sender, EventArgs e)
{
    // Create a new Workbook
    WorkBook workbook = WorkBook.Create(ExcelFileFormat.XLSX);

    // Create a Worksheet
    var sheet = workbook.CreateWorkSheet("2022 Budget");

    // Set cell headers
    sheet["A1"].Value = "January";
    sheet["B1"].Value = "February";
    sheet["C1"].Value = "March";
    sheet["D1"].Value = "April";
    sheet["E1"].Value = "May";
    sheet["F1"].Value = "June";
    sheet["G1"].Value = "July";
    sheet["H1"].Value = "August";

    // Fill worksheet cells with random values
    Random r = new Random();
    for (int i = 2; i <= 11; i++)
    {
        sheet["A" + i].Value = r.Next(1, 1000);
        sheet["B" + i].Value = r.Next(1000, 2000);
        sheet["C" + i].Value = r.Next(2000, 3000);
        sheet["D" + i].Value = r.Next(3000, 4000);
        sheet["E" + i].Value = r.Next(4000, 5000);
        sheet["F" + i].Value = r.Next(5000, 6000);
        sheet["G" + i].Value = r.Next(6000, 7000);
        sheet["H" + i].Value = r.Next(7000, 8000);
    }

    // Apply formatting (background and border)
    sheet["A1:H1"].Style.SetBackgroundColor("#d3d3d3");
    sheet["A1:H1"].Style.TopBorder.SetColor("#000000");
    sheet["A1:H1"].Style.BottomBorder.SetColor("#000000");
    sheet["H2:H11"].Style.RightBorder.SetColor("#000000");
    sheet["H2:H11"].Style.RightBorder.Type = IronXL.Styles.BorderType.Medium;
    sheet["A11:H11"].Style.BottomBorder.SetColor("#000000");
    sheet["A11:H11"].Style.BottomBorder.Type = IronXL.Styles.BorderType.Medium;

    // Apply formulas
    decimal sum = sheet["A2:A11"].Sum();
    decimal avg = sheet["B2:B11"].Avg();
    decimal max = sheet["C2:C11"].Max();
    decimal min = sheet["D2:D11"].Min();

    sheet["A12"].Value = "Sum";
    sheet["B12"].Value = sum;

    sheet["C12"].Value = "Avg";
    sheet["D12"].Value = avg;

    sheet["E12"].Value = "Max";
    sheet["F12"].Value = max;

    sheet["G12"].Value = "Min";
    sheet["H12"].Value = min;

    // Save and open the Excel file
    SaveService saveService = new SaveService();
    saveService.SaveAndView("Budget.xlsx", "application/octet-stream", workbook.ToStream());
}

private void ReadExcel(object sender, EventArgs e)
{
    // Store the path of the file
    string filepath = @"C:\Files\Customer Data.xlsx";
    WorkBook workbook = WorkBook.Load(filepath);
    WorkSheet sheet = workbook.WorkSheets.First();

    // Calculate the sum of a range
    decimal sum = sheet["B2:B10"].Sum();

    // Modify a cell value and apply styles
    sheet["B11"].Value = sum;
    sheet["B11"].Style.SetBackgroundColor("#808080");
    sheet["B11"].Style.Font.SetColor("#ffffff");

    // Save and open the Excel file
    SaveService saveService = new SaveService();
    saveService.SaveAndView("Modified Data.xlsx", "application/octet-stream", workbook.ToStream());

    DisplayAlert("Notification", "Excel file has been modified!", "OK");
}

private void ReadExcel(object sender, EventArgs e)
{
    // Store the path of the file
    string filepath = @"C:\Files\Customer Data.xlsx";
    WorkBook workbook = WorkBook.Load(filepath);
    WorkSheet sheet = workbook.WorkSheets.First();

    // Calculate the sum of a range
    decimal sum = sheet["B2:B10"].Sum();

    // Modify a cell value and apply styles
    sheet["B11"].Value = sum;
    sheet["B11"].Style.SetBackgroundColor("#808080");
    sheet["B11"].Style.Font.SetColor("#ffffff");

    // Save and open the Excel file
    SaveService saveService = new SaveService();
    saveService.SaveAndView("Modified Data.xlsx", "application/octet-stream", workbook.ToStream());

    DisplayAlert("Notification", "Excel file has been modified!", "OK");
}

using System;
using System.IO;

namespace MAUI_IronXL
{
    public partial class SaveService
    {
        public partial void SaveAndView(string fileName, string contentType, MemoryStream stream);
    }
}

using System;
using System.IO;

namespace MAUI_IronXL
{
    public partial class SaveService
    {
        public partial void SaveAndView(string fileName, string contentType, MemoryStream stream);
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Popups;

namespace MAUI_IronXL
{
    public partial class SaveService
    {
        public async partial void SaveAndView(string fileName, string contentType, MemoryStream stream)
        {
            StorageFile stFile;
            string extension = Path.GetExtension(fileName);
            IntPtr windowHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;

            if (!Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
            {
                FileSavePicker savePicker = new FileSavePicker();
                savePicker.DefaultFileExtension = ".xlsx";
                savePicker.SuggestedFileName = fileName;
                savePicker.FileTypeChoices.Add("XLSX", new List<string> { ".xlsx" });

                WinRT.Interop.InitializeWithWindow.Initialize(savePicker, windowHandle);
                stFile = await savePicker.PickSaveFileAsync();
            }
            else
            {
                StorageFolder local = ApplicationData.Current.LocalFolder;
                stFile = await local.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
            }

            if (stFile != null)
            {
                using (IRandomAccessStream zipStream = await stFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (Stream outputStream = zipStream.AsStreamForWrite())
                    {
                        outputStream.SetLength(0);
                        stream.WriteTo(outputStream);
                        await outputStream.FlushAsync();
                    }
                }

                MessageDialog msgDialog = new("Do you want to view the document?", "File has been created successfully");
                UICommand yesCmd = new("Yes");
                msgDialog.Commands.Add(yesCmd);
                UICommand noCmd = new("No");
                msgDialog.Commands.Add(noCmd);

                WinRT.Interop.InitializeWithWindow.Initialize(msgDialog, windowHandle);

                IUICommand cmd = await msgDialog.ShowAsync();
                if (cmd.Label == yesCmd.Label)
                {
                    await Windows.System.Launcher.LaunchFileAsync(stFile);
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Popups;

namespace MAUI_IronXL
{
    public partial class SaveService
    {
        public async partial void SaveAndView(string fileName, string contentType, MemoryStream stream)
        {
            StorageFile stFile;
            string extension = Path.GetExtension(fileName);
            IntPtr windowHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;

            if (!Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
            {
                FileSavePicker savePicker = new FileSavePicker();
                savePicker.DefaultFileExtension = ".xlsx";
                savePicker.SuggestedFileName = fileName;
                savePicker.FileTypeChoices.Add("XLSX", new List<string> { ".xlsx" });

                WinRT.Interop.InitializeWithWindow.Initialize(savePicker, windowHandle);
                stFile = await savePicker.PickSaveFileAsync();
            }
            else
            {
                StorageFolder local = ApplicationData.Current.LocalFolder;
                stFile = await local.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
            }

            if (stFile != null)
            {
                using (IRandomAccessStream zipStream = await stFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (Stream outputStream = zipStream.AsStreamForWrite())
                    {
                        outputStream.SetLength(0);
                        stream.WriteTo(outputStream);
                        await outputStream.FlushAsync();
                    }
                }

                MessageDialog msgDialog = new("Do you want to view the document?", "File has been created successfully");
                UICommand yesCmd = new("Yes");
                msgDialog.Commands.Add(yesCmd);
                UICommand noCmd = new("No");
                msgDialog.Commands.Add(noCmd);

                WinRT.Interop.InitializeWithWindow.Initialize(msgDialog, windowHandle);

                IUICommand cmd = await msgDialog.ShowAsync();
                if (cmd.Label == yesCmd.Label)
                {
                    await Windows.System.Launcher.LaunchFileAsync(stFile);
                }
            }
        }
    }
}