C# CSV から XLSX: CSV ファイルを Excel 形式に変換する

using IronXL;

// Load CSV file and convert to XLSX format
WorkBook workbook = WorkBook.LoadCSV("data.csv", fileFormat: ExcelFileFormat.XLSX, ListDelimiter: ",");

// Access the default worksheet containing CSV data
WorkSheet worksheet = workbook.DefaultWorkSheet;

// Save as Excel XLSX file
workbook.SaveAs("output.xlsx");

Imports IronXL

' Load CSV file and convert to XLSX format
Dim workbook As WorkBook = WorkBook.LoadCSV("data.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

' Access the default worksheet containing CSV data
Dim worksheet As WorkSheet = workbook.DefaultWorkSheet

' Save as Excel XLSX file
workbook.SaveAs("output.xlsx")

Install-Package IronXl

dotnet add package IronXl

using IronXL;
using System.Text;

// Load CSV with explicit encoding specification
WorkBook workbook = WorkBook.LoadCSV("international-data.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",",
    encoding: Encoding.UTF8);

// Access the worksheet containing the encoded data
WorkSheet sheet = workbook.DefaultWorkSheet;

// Inspect a cell to verify encoding was preserved
string cellValue = sheet["A1"].StringValue;

// Save the converted Excel file
workbook.SaveAs("encoded-output.xlsx");

IRON VB CONVERTER ERROR developers@ironsoftware.com

using IronXL;
using IronXL.Styles;

// Load CSV data
WorkBook workbook = WorkBook.LoadCSV("sales-report.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",");

WorkSheet sheet = workbook.DefaultWorkSheet;

// Format the header row with bold text and background color
Range headerRow = sheet["A1:Z1"];
headerRow.Style.Font.Bold = true;
headerRow.Style.SetBackgroundColor("#4472C4");
headerRow.Style.Font.Color = "#FFFFFF";

// Apply currency format to a numeric column
Range priceColumn = sheet["C2:C100"];
priceColumn.Style.NumberFormat = "$#,##0.00";

// Auto-fit column widths for readability
sheet.AutoSizeColumn(0);
sheet.AutoSizeColumn(1);
sheet.AutoSizeColumn(2);

workbook.SaveAs("formatted-report.xlsx");

Imports IronXL
Imports IronXL.Styles

' Load CSV data
Dim workbook As WorkBook = WorkBook.LoadCSV("sales-report.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

Dim sheet As WorkSheet = workbook.DefaultWorkSheet

' Format the header row with bold text and background color
Dim headerRow As Range = sheet("A1:Z1")
headerRow.Style.Font.Bold = True
headerRow.Style.SetBackgroundColor("#4472C4")
headerRow.Style.Font.Color = "#FFFFFF"

' Apply currency format to a numeric column
Dim priceColumn As Range = sheet("C2:C100")
priceColumn.Style.NumberFormat = "$#,##0.00"

' Auto-fit column widths for readability
sheet.AutoSizeColumn(0)
sheet.AutoSizeColumn(1)
sheet.AutoSizeColumn(2)

workbook.SaveAs("formatted-report.xlsx")

using IronXL;
using IronXL.Drawing.Charts;

// Load CSV and convert to Excel format
WorkBook workbook = WorkBook.LoadCSV("sales-data.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",");

WorkSheet worksheet = workbook.DefaultWorkSheet;

// Create a column chart from the converted CSV data
IChart chart = worksheet.CreateChart(ChartType.Column, 10, 0, 25, 10);

// Add data series from the worksheet ranges
IChartSeries series = chart.AddSeries("A2:A10", "B2:B10");
series.Title = "Monthly Sales";

// Configure chart appearance
chart.SetTitle("Sales Performance");
chart.SetLegendPosition(LegendPosition.Bottom);

// Plot the chart and save the workbook
chart.Plot();
workbook.SaveAs("sales-with-chart.xlsx");

Imports IronXL
Imports IronXL.Drawing.Charts

' Load CSV and convert to Excel format
Dim workbook As WorkBook = WorkBook.LoadCSV("sales-data.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

Dim worksheet As WorkSheet = workbook.DefaultWorkSheet

' Create a column chart from the converted CSV data
Dim chart As IChart = worksheet.CreateChart(ChartType.Column, 10, 0, 25, 10)

' Add data series from the worksheet ranges
Dim series As IChartSeries = chart.AddSeries("A2:A10", "B2:B10")
series.Title = "Monthly Sales"

' Configure chart appearance
chart.SetTitle("Sales Performance")
chart.SetLegendPosition(LegendPosition.Bottom)

' Plot the chart and save the workbook
chart.Plot()
workbook.SaveAs("sales-with-chart.xlsx")

using IronXL;
using System.Data;

// Load CSV file into workbook
WorkBook sourceWorkbook = WorkBook.LoadCSV("input.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",");

// Convert worksheet to DataTable for manipulation
DataTable table = sourceWorkbook.DefaultWorkSheet.ToDataTable(true);

// Filter rows -- keep only rows where the third column value is greater than 100
DataRow[] filtered = table.Select("Column3 > 100");
DataTable filteredTable = filtered.Length > 0 ? filtered.CopyToDataTable() : table.Clone();

// Create new workbook from modified data
WorkBook outputWorkbook = WorkBook.Create(ExcelFileFormat.XLSX);
WorkSheet outputSheet = outputWorkbook.CreateWorkSheet("Processed Data");

// Import filtered DataTable back into Excel
outputSheet.LoadFromDataTable(filteredTable, true);

// Save the final XLSX file
outputWorkbook.SaveAs("processed-output.xlsx");

Imports IronXL
Imports System.Data

' Load CSV file into workbook
Dim sourceWorkbook As WorkBook = WorkBook.LoadCSV("input.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

' Convert worksheet to DataTable for manipulation
Dim table As DataTable = sourceWorkbook.DefaultWorkSheet.ToDataTable(True)

' Filter rows -- keep only rows where the third column value is greater than 100
Dim filtered As DataRow() = table.Select("Column3 > 100")
Dim filteredTable As DataTable = If(filtered.Length > 0, filtered.CopyToDataTable(), table.Clone())

' Create new workbook from modified data
Dim outputWorkbook As WorkBook = WorkBook.Create(ExcelFileFormat.XLSX)
Dim outputSheet As WorkSheet = outputWorkbook.CreateWorkSheet("Processed Data")

' Import filtered DataTable back into Excel
outputSheet.LoadFromDataTable(filteredTable, True)

' Save the final XLSX file
outputWorkbook.SaveAs("processed-output.xlsx")

using IronXL;
using System.IO;

// Load and convert CSV data
WorkBook workbook = WorkBook.LoadCSV("report-data.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",");

WorkSheet sheet = workbook.DefaultWorkSheet;

// Save workbook to a memory stream instead of a file
using MemoryStream stream = new MemoryStream();
workbook.SaveAs(stream);

// Reset stream position for reading
stream.Position = 0;

// The stream is now ready to pass to an HTTP response, upload to cloud storage,
// or attach to an email. For ASP.NET Core:
// return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "report.xlsx");

// Write bytes to verify stream contains XLSX data
byte[] xlsxBytes = stream.ToArray();
Console.WriteLine($"Generated XLSX size: {xlsxBytes.Length} bytes");

Imports IronXL
Imports System.IO

' Load and convert CSV data
Dim workbook As WorkBook = WorkBook.LoadCSV("report-data.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

Dim sheet As WorkSheet = workbook.DefaultWorkSheet

' Save workbook to a memory stream instead of a file
Using stream As New MemoryStream()
    workbook.SaveAs(stream)

    ' Reset stream position for reading
    stream.Position = 0

    ' The stream is now ready to pass to an HTTP response, upload to cloud storage,
    ' or attach to an email. For ASP.NET Core:
    ' Return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "report.xlsx")

    ' Write bytes to verify stream contains XLSX data
    Dim xlsxBytes As Byte() = stream.ToArray()
    Console.WriteLine($"Generated XLSX size: {xlsxBytes.Length} bytes")
End Using

using IronXL;

// Load primary CSV data
WorkBook workbook = WorkBook.LoadCSV("quarterly-data.csv",
    fileFormat: ExcelFileFormat.XLSX,
    ListDelimiter: ",");

// Rename the default sheet created from the CSV
WorkSheet q1Sheet = workbook.DefaultWorkSheet;
q1Sheet.Name = "Q1 Data";

// Create additional worksheets for summary information
WorkSheet summarySheet = workbook.CreateWorkSheet("Summary");

// Write summary headers and formulas
summarySheet["A1"].Value = "Total Records";
summarySheet["B1"].Formula = $"=COUNTA('{q1Sheet.Name}'!A:A)-1";

summarySheet["A2"].Value = "Data Sheet";
summarySheet["B2"].Value = q1Sheet.Name;

// Save the multi-sheet workbook
workbook.SaveAs("multi-sheet-report.xlsx");

Imports IronXL

' Load primary CSV data
Dim workbook As WorkBook = WorkBook.LoadCSV("quarterly-data.csv", fileFormat:=ExcelFileFormat.XLSX, ListDelimiter:=",")

' Rename the default sheet created from the CSV
Dim q1Sheet As WorkSheet = workbook.DefaultWorkSheet
q1Sheet.Name = "Q1 Data"

' Create additional worksheets for summary information
Dim summarySheet As WorkSheet = workbook.CreateWorkSheet("Summary")

' Write summary headers and formulas
summarySheet("A1").Value = "Total Records"
summarySheet("B1").Formula = $"=COUNTA('{q1Sheet.Name}'!A:A)-1"

summarySheet("A2").Value = "Data Sheet"
summarySheet("B2").Value = q1Sheet.Name

' Save the multi-sheet workbook
workbook.SaveAs("multi-sheet-report.xlsx")