Add project files.

DXApp.TemplateKitProject/Pages/Invoices/Upload.cshtml

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+@page
+@model DXApp.TemplateKitProject.Pages.Invoices.UploadModel
+@{
+    ViewData["Title"] = "PDF/A Upload";
+}
+
+<h2>PDF/A Rechnung hochladen</h2>
+
+<form method="post" enctype="multipart/form-data">
+    <div class="mb-3">
+        <label asp-for="PdfFile" class="form-label">PDF/A-Datei auswählen</label>
+        <input asp-for="PdfFile" type="file" class="form-control" accept=".pdf" />
+        <span asp-validation-for="PdfFile" class="text-danger"></span>
+    </div>
+    <button type="submit" class="btn btn-primary">Hochladen &amp; Analysieren</button>
+</form>
+
+@if (Model.ExtractionDone)
+{
+    <hr />
+    <h4>Ergebnis</h4>
+
+    @if (!string.IsNullOrEmpty(Model.ErrorMessage))
+    {
+        <div class="alert alert-danger">@Model.ErrorMessage</div>
+    }
+    else if (Model.Result == null || !Model.Result.HasAttachments)
+    {
+        <div class="alert alert-warning">Keine Anhänge in der PDF gefunden.</div>
+    }
+    else
+    {
+        <div class="alert @(Model.Result.HasZugferdXml ? "alert-success" : "alert-warning")">
+            @if (Model.Result.HasZugferdXml)
+            {
+                <strong>✔ ZUGFeRD/Factur-X XML gefunden:</strong>
+                <span>@Model.Result.ZugferdXmlAttachment!.OriginalFileName</span>
+            }
+            else
+            {
+                <strong>⚠ Kein ZUGFeRD-XML gefunden.</strong>
+            }
+        </div>
+
+        <table class="table table-sm table-bordered">
+            <thead class="table-light">
+                <tr>
+                    <th>Dateiname</th>
+                    <th>Größe</th>
+                    <th>ZUGFeRD?</th>
+                    <th>Gespeichert unter</th>
+                </tr>
+            </thead>
+            <tbody>
+                @foreach (var a in Model.Result.Attachments)
+                {
+                    <tr class="@(a.IsZugferdXml ? "table-success" : "")">
+                        <td>@a.OriginalFileName</td>
+                        <td>@($"{a.FileSizeBytes:N0}") Bytes</td>
+                        <td>@(a.IsZugferdXml ? "✔ Ja" : "Nein")</td>
+                        <td><small class="text-muted">@a.SavedFilePath</small></td>
+                    </tr>
+                }
+            </tbody>
+        </table>
+    }
+}

DXApp.TemplateKitProject/Pages/Invoices/Upload.cshtml.cs

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+using DXApp.TemplateKitProject.Models;
+using DXApp.TemplateKitProject.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace DXApp.TemplateKitProject.Pages.Invoices;
+
+public class UploadModel(
+    PdfAttachmentExtractorService extractor,
+    ILogger<UploadModel> logger) : PageModel
+{
+    [BindProperty]
+    public IFormFile? PdfFile { get; set; }
+
+    public PdfExtractionResult? Result { get; private set; }
+    public bool ExtractionDone { get; private set; }
+    public string? ErrorMessage { get; private set; }
+
+    public void OnGet()
+    { }
+
+    public async Task<IActionResult> OnPostAsync()
+    {
+        if (PdfFile is null || PdfFile.Length == 0)
+        {
+            ModelState.AddModelError(nameof(PdfFile), "Bitte eine PDF-Datei auswählen.");
+            return Page();
+        }
+
+        if (!PdfFile.FileName.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase))
+        {
+            ModelState.AddModelError(nameof(PdfFile), "Nur PDF-Dateien sind erlaubt.");
+            return Page();
+        }
+
+        ExtractionDone = true;
+
+        try
+        {
+            await using var stream = PdfFile.OpenReadStream();
+            Result = extractor.ExtractAttachments(stream, PdfFile.FileName);
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Fehler beim Verarbeiten der Datei '{FileName}'.", PdfFile.FileName);
+            ErrorMessage = $"Fehler beim Verarbeiten der Datei: {ex.Message}";
+        }
+
+        return Page();
+    }
+}