C#で既存のスプレッドシートを読み込む方法</#35;

using IronXL;

// Supported for XLSX, XLS, XLSM, XLTX, CSV and TSV
WorkBook workBook = WorkBook.Load("sample.xlsx");

Imports IronXL

' Supported for XLSX, XLS, XLSM, XLTX, CSV and TSV
Private workBook As WorkBook = WorkBook.Load("sample.xlsx")

// Load password-protected Excel file
WorkBook protectedWorkBook = WorkBook.Load("protected.xlsx", "myPassword123");

// Work with the workbook normally
WorkSheet sheet = protectedWorkBook.DefaultWorkSheet;
sheet["B2"].Value = "Updated secure data";

// Save with password protection
protectedWorkBook.SaveAs("updated_protected.xlsx");

' Load password-protected Excel file
Dim protectedWorkBook As WorkBook = WorkBook.Load("protected.xlsx", "myPassword123")

' Work with the workbook normally
Dim sheet As WorkSheet = protectedWorkBook.DefaultWorkSheet
sheet("B2").Value = "Updated secure data"

' Save with password protection
protectedWorkBook.SaveAs("updated_protected.xlsx")

// Loading from byte array
byte[] excelBytes = File.ReadAllBytes("sample.xlsx");
WorkBook workBookFromBytes = WorkBook.FromByteArray(excelBytes);

// Loading from stream
using (FileStream stream = new FileStream("sample.xlsx", FileMode.Open))
{
    WorkBook workBookFromStream = WorkBook.FromStream(stream);

    // Process the workbook
    var sheet = workBookFromStream.DefaultWorkSheet;
    Console.WriteLine($"Sheet has {sheet.RowCount} rows");
}

// Loading from MemoryStream (common in web applications)
using (MemoryStream memStream = new MemoryStream(excelBytes))
{
    WorkBook workBookFromMemory = WorkBook.FromStream(memStream);
}

Imports System.IO

' Loading from byte array
Dim excelBytes As Byte() = File.ReadAllBytes("sample.xlsx")
Dim workBookFromBytes As WorkBook = WorkBook.FromByteArray(excelBytes)

' Loading from stream
Using stream As New FileStream("sample.xlsx", FileMode.Open)
    Dim workBookFromStream As WorkBook = WorkBook.FromStream(stream)

    ' Process the workbook
    Dim sheet = workBookFromStream.DefaultWorkSheet
    Console.WriteLine($"Sheet has {sheet.RowCount} rows")
End Using

' Loading from MemoryStream (common in web applications)
Using memStream As New MemoryStream(excelBytes)
    Dim workBookFromMemory As WorkBook = WorkBook.FromStream(memStream)
End Using

using IronXL;

// Load CSV file
WorkBook workBook = WorkBook.LoadCSV("sample.csv");

Imports IronXL

' Load CSV file
Private workBook As WorkBook = WorkBook.LoadCSV("sample.csv")

using IronXL;
using System.Data;

// Create dataset
DataSet dataSet = new DataSet();

// Create workbook
WorkBook workBook = WorkBook.Create();

// Load DataSet
WorkBook.LoadWorkSheetsFromDataSet(dataSet, workBook);

Imports IronXL
Imports System.Data

' Create dataset
Private dataSet As New DataSet()

' Create workbook
Private workBook As WorkBook = WorkBook.Create()

' Load DataSet
WorkBook.LoadWorkSheetsFromDataSet(dataSet, workBook)