Razor PagesでExcelファイルを生成する方法

public FileResult OnPostExport()
{
    // Create a new WorkBook with XLSX format
    WorkBook workBook = new WorkBook(IronXL.ExcelFileFormat.XLSX);
    // Create a new WorkSheet named "data"
    WorkSheet workSheet = workBook.CreateWorkSheet("data");

    // Add headers to the new worksheet
    workSheet["A1"].Value = "Product EN";
    workSheet["B1"].Value = "SKU";
    workSheet["C1"].Value = "Customer";

    // Make header text bold
    workSheet["A1:C1"].Style.Font.Bold = true;

    // Add dummy data to the worksheet
    workSheet["A2"].Value = "Iron Rods";
    workSheet["A3"].Value = "Mobile Phones";
    workSheet["A4"].Value = "Chargers";

    workSheet["B2"].Value = "105";
    workSheet["B3"].Value = "285";
    workSheet["B4"].Value = "301";

    workSheet["C2"].Value = "Adam";
    workSheet["C3"].Value = "Ellen";
    workSheet["C4"].Value = "Tom";

    // Convert the WorkBook to a byte array Stream for download
    return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx");
}

Public Function OnPostExport() As FileResult
	' Create a new WorkBook with XLSX format
	Dim workBook As New WorkBook(IronXL.ExcelFileFormat.XLSX)
	' Create a new WorkSheet named "data"
	Dim workSheet As WorkSheet = workBook.CreateWorkSheet("data")

	' Add headers to the new worksheet
	workSheet("A1").Value = "Product EN"
	workSheet("B1").Value = "SKU"
	workSheet("C1").Value = "Customer"

	' Make header text bold
	workSheet("A1:C1").Style.Font.Bold = True

	' Add dummy data to the worksheet
	workSheet("A2").Value = "Iron Rods"
	workSheet("A3").Value = "Mobile Phones"
	workSheet("A4").Value = "Chargers"

	workSheet("B2").Value = "105"
	workSheet("B3").Value = "285"
	workSheet("B4").Value = "301"

	workSheet("C2").Value = "Adam"
	workSheet("C3").Value = "Ellen"
	workSheet("C4").Value = "Tom"

	' Convert the WorkBook to a byte array Stream for download
	Return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx")
End Function

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<div class="text-center">
    <h1 class="display-4">IronXL Generate Excel File</h1>
    <p class="m-5">IronXL is an Excel Library for C# that allows developers to read and edit Excel data from XLS and XLSX documents without using Microsoft.Office.Interop.Excel</p>
    <form method="post" asp-page-handler="Export">
        <button class="btn btn-success p-3">Generate Excel File!</button>
    </form>
</div>