ASP.NET C#とIronPDFでPDFを新しいウィンドウで開く方法

using System.Net.Http;
using System.Text;
using System.Text.Json;

namespace XamarinPdfApp.Services
{
    public class PdfService
    {
        private readonly HttpClient _httpClient;
        private const string ApiUrl = "https://your-api.example.com/api/pdf/generate";

        public PdfService()
        {
            _httpClient = new HttpClient
            {
                Timeout = TimeSpan.FromSeconds(60)
            };
        }

        public async Task<byte[]> GeneratePdfAsync(string htmlContent)
        {
            var payload = new { HtmlContent = htmlContent };
            var json = JsonSerializer.Serialize(payload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var response = await _httpClient.PostAsync(ApiUrl, content);

            if (response.IsSuccessStatusCode)
                return await response.Content.ReadAsByteArrayAsync();

            var error = await response.Content.ReadAsStringAsync();
            throw new InvalidOperationException($"PDF generation failed ({(int)response.StatusCode}): {error}");
        }
    }
}

Imports System.Net.Http
Imports System.Text
Imports System.Text.Json

Namespace XamarinPdfApp.Services
    Public Class PdfService
        Private ReadOnly _httpClient As HttpClient
        Private Const ApiUrl As String = "https://your-api.example.com/api/pdf/generate"

        Public Sub New()
            _httpClient = New HttpClient With {
                .Timeout = TimeSpan.FromSeconds(60)
            }
        End Sub

        Public Async Function GeneratePdfAsync(htmlContent As String) As Task(Of Byte())
            Dim payload = New With {Key .HtmlContent = htmlContent}
            Dim json = JsonSerializer.Serialize(payload)
            Dim content = New StringContent(json, Encoding.UTF8, "application/json")

            Dim response = Await _httpClient.PostAsync(ApiUrl, content)

            If response.IsSuccessStatusCode Then
                Return Await response.Content.ReadAsByteArrayAsync()
            End If

            Dim error = Await response.Content.ReadAsStringAsync()
            Throw New InvalidOperationException($"PDF generation failed ({CInt(response.StatusCode)}): {error}")
        End Function
    End Class
End Namespace

using System.Threading.Tasks;

namespace XamarinPdfApp.Interfaces
{
    public interface ISaveFile
    {
        Task<string> SavePdfAsync(string filename, byte[] pdfData);
    }
}

Imports System.Threading.Tasks

Namespace XamarinPdfApp.Interfaces
    Public Interface ISaveFile
        Function SavePdfAsync(filename As String, pdfData As Byte()) As Task(Of String)
    End Interface
End Namespace

using Foundation;
using QuickLook;
using UIKit;
using XamarinPdfApp.Interfaces;
using Xamarin.Forms;

[assembly: Dependency(typeof(XamarinPdfApp.iOS.SaveFileIOS))]
namespace XamarinPdfApp.iOS
{
    public class SaveFileIOS : ISaveFile
    {
        public async Task<string> SavePdfAsync(string filename, byte[] pdfData)
        {
            var documents = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            var filePath = System.IO.Path.Combine(documents, filename);
            await System.IO.File.WriteAllBytesAsync(filePath, pdfData);
            return filePath;
        }
    }
}

Imports Foundation
Imports QuickLook
Imports UIKit
Imports XamarinPdfApp.Interfaces
Imports Xamarin.Forms

<Assembly: Dependency(GetType(XamarinPdfApp.iOS.SaveFileIOS))>
Namespace XamarinPdfApp.iOS
    Public Class SaveFileIOS
        Implements ISaveFile

        Public Async Function SavePdfAsync(filename As String, pdfData As Byte()) As Task(Of String) Implements ISaveFile.SavePdfAsync
            Dim documents = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
            Dim filePath = System.IO.Path.Combine(documents, filename)
            Await System.IO.File.WriteAllBytesAsync(filePath, pdfData)
            Return filePath
        End Function
    End Class
End Namespace

public string BuildInvoiceHtml(Invoice invoice)
{
    var rows = string.Join(
        "\n",
        invoice.アイテムs.Select(i =>
            $"<tr><td>{i.Name}</td><td>{i.Quantity}</td><td>${i.UnitPrice:F2}</td><td>${i.Total:F2}</td></tr>"
        )
    );

    return $@"<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='UTF-8'>
<style>
  body {{font-family: Arial, sans-serif; color: #333; margin: 0; padding: 30px;}}
  h1 {{color: #1a73e8;}}
  table {{width: 100%; border-collapse: collapse; margin-top: 20px;}}
  th {{background: #1a73e8; color: #fff; padding: 10px; text-align: left;}}
  td {{padding: 10px; border-bottom: 1px solid #e0e0e0;}}
  .total {{font-weight: bold; font-size: 1.1em; text-align: right; margin-top: 15px;}}
</style>
</head>
<body>
  <h1>Invoice #{invoice.Number}</h1>
  <p>Date: {invoice.Date:yyyy-MM-dd} &nbsp;|&nbsp; Due: {invoice.DueDate:yyyy-MM-dd}</p>
  <p>Bill to: <strong>{invoice.ClientName}</strong></p>
  <table>
    <thead><tr><th>アイテム</th><th>Qty</th><th>Unit Price</th><th>Total</th></tr></thead>
    <tbody>{rows}</tbody>
  </table>
  <p class='total'>Grand Total: ${invoice.GrandTotal:F2}</p>
</body>
</html>";
}

Imports System
Imports System.Linq

Public Class Invoice
    Public Property Number As String
    Public Property Date As DateTime
    Public Property DueDate As DateTime
    Public Property ClientName As String
    Public Property アイテムs As List(Of アイテム)
    Public Property GrandTotal As Decimal
End Class

Public Class アイテム
    Public Property Name As String
    Public Property Quantity As Integer
    Public Property UnitPrice As Decimal
    Public Property Total As Decimal
End Class

Public Function BuildInvoiceHtml(invoice As Invoice) As String
    Dim rows = String.Join(
        vbLf,
        invoice.アイテムs.Select(Function(i) 
            $"<tr><td>{i.Name}</td><td>{i.Quantity}</td><td>${i.UnitPrice:F2}</td><td>${i.Total:F2}</td></tr>"
        )
    )

    Return $"
<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='UTF-8'>
<style>
  body {{font-family: Arial, sans-serif; color: #333; margin: 0; padding: 30px;}}
  h1 {{color: #1a73e8;}}
  table {{width: 100%; border-collapse: collapse; margin-top: 20px;}}
  th {{background: #1a73e8; color: #fff; padding: 10px; text-align: left;}}
  td {{padding: 10px; border-bottom: 1px solid #e0e0e0;}}
  .total {{font-weight: bold; font-size: 1.1em; text-align: right; margin-top: 15px;}}
</style>
</head>
<body>
  <h1>Invoice #{invoice.Number}</h1>
  <p>Date: {invoice.Date:yyyy-MM-dd} &nbsp;|&nbsp; Due: {invoice.DueDate:yyyy-MM-dd}</p>
  <p>Bill to: <strong>{invoice.ClientName}</strong></p>
  <table>
    <thead><tr><th>アイテム</th><th>Qty</th><th>Unit Price</th><th>Total</th></tr></thead>
    <tbody>{rows}</tbody>
  </table>
  <p class='total'>Grand Total: ${invoice.GrandTotal:F2}</p>
</body>
</html>"
End Function

[HttpPost("form")]
public async Task<IActionResult> GenerateForm([FromBody] FormRequest request)
{
    var renderer = new ChromePdfRenderer();
    // Render an HTML form template to create an interactive PDF form
    var pdf = await renderer.RenderHtmlAsPdfAsync(request.HtmlTemplate);

    // Fill known values before returning
    var form = pdf.Form;
    foreach (var field in request.FieldValues)
    {
        var pdfField = form.Fields.FirstOrDefault(f => f.Name == field.Key);
        if (pdfField is IronPdf.Forms.PdfFormTextFieldField textField)
            textField.Value = field.Value;
    }

    return File(pdf.BinaryData, "application/pdf", "form.pdf");
}

Imports Microsoft.AspNetCore.Mvc
Imports IronPdf

<HttpPost("form")>
Public Async Function GenerateForm(<FromBody> request As FormRequest) As Task(Of IActionResult)
    Dim renderer As New ChromePdfRenderer()
    ' Render an HTML form template to create an interactive PDF form
    Dim pdf = Await renderer.RenderHtmlAsPdfAsync(request.HtmlTemplate)

    ' Fill known values before returning
    Dim form = pdf.Form
    For Each field In request.FieldValues
        Dim pdfField = form.Fields.FirstOrDefault(Function(f) f.Name = field.Key)
        If TypeOf pdfField Is IronPdf.Forms.PdfFormTextFieldField Then
            Dim textField = DirectCast(pdfField, IronPdf.Forms.PdfFormTextFieldField)
            textField.Value = field.Value
        End If
    Next

    Return File(pdf.BinaryData, "application/pdf", "form.pdf")
End Function

IronPdf.License.LicenseKey = Environment.GetEnvironmentVariable("IRONPDF_LICENSE_KEY")
    ?? throw new InvalidOperationException("IronPDF license key not set.");

Imports System
Imports IronPdf

IronPdf.License.LicenseKey = If(Environment.GetEnvironmentVariable("IRONPDF_LICENSE_KEY"), Throw New InvalidOperationException("IronPDF license key not set."))