C# CSV ファイル リーダー: IronXLで CSV データを解析および処理する

# .NET CLI
dotnet add package IronXl.Excel

# NuGet Package Manager Console
Install-Package IronXl.Excel

using IronXL;

// Load CSV file
WorkBook workbook = WorkBook.LoadCSV("data.csv");
WorkSheet sheet = workbook.DefaultWorkSheet;

// Read a specific cell
string cellValue = sheet["A1"].StringValue;

// Iterate through all rows and cells
foreach (var row in sheet.Rows)
{
    foreach (var cell in row)
    {
        Console.WriteLine(cell.StringValue);
    }
}

Imports IronXL

' Load CSV file
Dim workbook As WorkBook = WorkBook.LoadCSV("data.csv")
Dim sheet As WorkSheet = workbook.DefaultWorkSheet

' Read a specific cell
Dim cellValue As String = sheet("A1").StringValue

' Iterate through all rows and cells
For Each row In sheet.Rows
    For Each cell In row
        Console.WriteLine(cell.StringValue)
    Next
Next

using IronXL;

// Load CSV with semicolon delimiter (common in European data exports)
WorkBook workbook = WorkBook.LoadCSV("european-data.csv",
    fileFormat: ExcelFileFormat.XLSX,
    listDelimiter: ";");

// Load tab-separated values (TSV)
WorkBook tsvWorkbook = WorkBook.LoadCSV("export_data.tsv",
    fileFormat: ExcelFileFormat.XLSX,
    listDelimiter: "\t");

// Load pipe-delimited file
WorkBook pipeWorkbook = WorkBook.LoadCSV("log_export.csv",
    fileFormat: ExcelFileFormat.XLSX,
    listDelimiter: "|");

// Access data normally after loading
WorkSheet sheet = workbook.DefaultWorkSheet;
decimal totalSales = sheet["B2:B10"].Sum();

Console.WriteLine($"Total sales: {totalSales}");

Imports IronXL

' Load CSV with semicolon delimiter (common in European data exports)
Dim workbook As WorkBook = WorkBook.LoadCSV("european-data.csv", fileFormat:=ExcelFileFormat.XLSX, listDelimiter:=";")

' Load tab-separated values (TSV)
Dim tsvWorkbook As WorkBook = WorkBook.LoadCSV("export_data.tsv", fileFormat:=ExcelFileFormat.XLSX, listDelimiter:=vbTab)

' Load pipe-delimited file
Dim pipeWorkbook As WorkBook = WorkBook.LoadCSV("log_export.csv", fileFormat:=ExcelFileFormat.XLSX, listDelimiter:="|")

' Access data normally after loading
Dim sheet As WorkSheet = workbook.DefaultWorkSheet
Dim totalSales As Decimal = sheet("B2:B10").Sum()

Console.WriteLine($"Total sales: {totalSales}")

using IronXL;

// Define a typed model matching your CSV structure
public record Product(string Name, decimal Price, int Stock, DateTime? LastUpdated);

// Load and parse CSV file
WorkBook workbook = WorkBook.LoadCSV("inventory.csv");
WorkSheet sheet = workbook.DefaultWorkSheet;

var products = new List<Product>();

// Start from row 2 to skip the header row
for (int row = 2; row <= sheet.RowCount; row++)
{
    products.Add(new Product(
        Name: sheet[$"A{row}"].StringValue,
        Price: sheet[$"B{row}"].DecimalValue,
        Stock: sheet[$"C{row}"].IntValue,
        LastUpdated: sheet[$"D{row}"].DateTimeValue
    ));
}

// Use LINQ for analysis after loading
var lowStock = products.Where(p => p.Stock < 10).ToList();
var highValue = products.Where(p => p.Price > 100m).OrderByDescending(p => p.Price).ToList();

Console.WriteLine($"Products with low stock: {lowStock.Count}");
Console.WriteLine($"High-value products: {highValue.Count}");

Imports IronXL

' Define a typed model matching your CSV structure
Public Class Product
    Public Property Name As String
    Public Property Price As Decimal
    Public Property Stock As Integer
    Public Property LastUpdated As DateTime?

    Public Sub New(name As String, price As Decimal, stock As Integer, lastUpdated As DateTime?)
        Me.Name = name
        Me.Price = price
        Me.Stock = stock
        Me.LastUpdated = lastUpdated
    End Sub
End Class

' Load and parse CSV file
Dim workbook As WorkBook = WorkBook.LoadCSV("inventory.csv")
Dim sheet As WorkSheet = workbook.DefaultWorkSheet

Dim products As New List(Of Product)()

' Start from row 2 to skip the header row
For row As Integer = 2 To sheet.RowCount
    products.Add(New Product(
        Name:=sheet($"A{row}").StringValue,
        Price:=sheet($"B{row}").DecimalValue,
        Stock:=sheet($"C{row}").IntValue,
        LastUpdated:=sheet($"D{row}").DateTimeValue
    ))
Next

' Use LINQ for analysis after loading
Dim lowStock = products.Where(Function(p) p.Stock < 10).ToList()
Dim highValue = products.Where(Function(p) p.Price > 100D).OrderByDescending(Function(p) p.Price).ToList()

Console.WriteLine($"Products with low stock: {lowStock.Count}")
Console.WriteLine($"High-value products: {highValue.Count}")

using IronXL;

// Load CSV file
WorkBook csvWorkbook = WorkBook.LoadCSV("monthly-report.csv");
WorkSheet sheet = csvWorkbook.DefaultWorkSheet;

// Apply formatting before saving
sheet["A1:D1"].Style.Font.Bold = true;
sheet["A1:D1"].Style.BackgroundColor = "#4472C4";
sheet["A1:D1"].Style.Font.Color = "#FFFFFF";

// Apply currency format to price column
sheet["B2:B1000"].FormatString = "$#,##0.00";

// Apply date format to date column
sheet["D2:D1000"].FormatString = "yyyy-MM-dd";

// Save as Excel with a single method call
csvWorkbook.SaveAs("monthly-report.xlsx");

Console.WriteLine("Conversion complete: monthly-report.xlsx");

Imports IronXL

' Load CSV file
Dim csvWorkbook As WorkBook = WorkBook.LoadCSV("monthly-report.csv")
Dim sheet As WorkSheet = csvWorkbook.DefaultWorkSheet

' Apply formatting before saving
sheet("A1:D1").Style.Font.Bold = True
sheet("A1:D1").Style.BackgroundColor = "#4472C4"
sheet("A1:D1").Style.Font.Color = "#FFFFFF"

' Apply currency format to price column
sheet("B2:B1000").FormatString = "$#,##0.00"

' Apply date format to date column
sheet("D2:D1000").FormatString = "yyyy-MM-dd"

' Save as Excel with a single method call
csvWorkbook.SaveAs("monthly-report.xlsx")

Console.WriteLine("Conversion complete: monthly-report.xlsx")

using IronXL;

// Apply license key at application startup
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY-HERE";

// Verify the license is active
if (IronXl.License.IsValidLicense("YOUR-LICENSE-KEY-HERE"))
{
    Console.WriteLine("IronXL license is active.");
}

// Now use IronXL normally
WorkBook workbook = WorkBook.LoadCSV("data.csv");
WorkSheet sheet = workbook.DefaultWorkSheet;
Console.WriteLine($"Loaded {sheet.RowCount} rows.");

Imports IronXL

' Apply license key at application startup
IronXl.License.LicenseKey = "YOUR-LICENSE-KEY-HERE"

' Verify the license is active
If IronXl.License.IsValidLicense("YOUR-LICENSE-KEY-HERE") Then
    Console.WriteLine("IronXL license is active.")
End If

' Now use IronXL normally
Dim workbook As WorkBook = WorkBook.LoadCSV("data.csv")
Dim sheet As WorkSheet = workbook.DefaultWorkSheet
Console.WriteLine($"Loaded {sheet.RowCount} rows.")