From f19251ac1a406779e5620a28aff785021303153f Mon Sep 17 00:00:00 2001
From: OlgunR <OlgunR@DD-PC-ENT05N>
Date: Mon, 8 Jun 2026 08:38:44 +0200
Subject: [PATCH] Add DevExpress Reporting and Custom Report Storage

Updated project dependencies to include DevExpress Reporting and PDF Drawing libraries. Registered DevExpress services and middleware in `Program.cs`. Added `CustomReportStorageWebExtension` to handle read-only invoice reports, including database and file system integration. Enhanced logging for better traceability and error handling.
---
 .../DXApp.TemplateKitProject.csproj           |   4 +-
 .../CustomReportStorageWebExtension.cs        | 119 ++++++++++++++++++
 DXApp.TemplateKitProject/Program.cs           |  16 ++-
 3 files changed, 137 insertions(+), 2 deletions(-)
 create mode 100644 DXApp.TemplateKitProject/DevExpressExtensions/CustomReportStorageWebExtension.cs

diff --git a/DXApp.TemplateKitProject/DXApp.TemplateKitProject.csproj b/DXApp.TemplateKitProject/DXApp.TemplateKitProject.csproj
index 47a1c74..b0e4ad9 100644
--- a/DXApp.TemplateKitProject/DXApp.TemplateKitProject.csproj
+++ b/DXApp.TemplateKitProject/DXApp.TemplateKitProject.csproj
@@ -16,8 +16,10 @@
   </Target>
 
   <ItemGroup>
+    <PackageReference Include="DevExpress.AspNetCore.Reporting" Version="25.2.7" />
     <PackageReference Include="DevExpress.Document.Processor" Version="25.2.7" />
-    <PackageReference Include="DevExtreme.AspNet.Core" Version="25.2.*" />
+    <PackageReference Include="DevExpress.Pdf.Drawing" Version="25.2.7" />
+    <PackageReference Include="DevExtreme.AspNet.Core" Version="25.2.7" />
     <PackageReference Include="MailKit" Version="4.16.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.8" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.8">
diff --git a/DXApp.TemplateKitProject/DevExpressExtensions/CustomReportStorageWebExtension.cs b/DXApp.TemplateKitProject/DevExpressExtensions/CustomReportStorageWebExtension.cs
new file mode 100644
index 0000000..78bd5d1
--- /dev/null
+++ b/DXApp.TemplateKitProject/DevExpressExtensions/CustomReportStorageWebExtension.cs
@@ -0,0 +1,119 @@
+using DevExpress.XtraReports.UI;
+using DevExpress.XtraReports.Web.Extensions;
+using DXApp.TemplateKitProject.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace DXApp.TemplateKitProject.DevExpressExtensions;
+
+public class CustomReportStorageWebExtension : ReportStorageWebExtension
+{
+    private readonly AppDbContext _db;
+    private readonly ILogger<CustomReportStorageWebExtension> _logger;
+
+    public CustomReportStorageWebExtension(
+        AppDbContext db,
+        ILogger<CustomReportStorageWebExtension> logger)
+    {
+        _db = db;
+        _logger = logger;
+    }
+
+    public override bool CanSetData(string url)
+    {
+        // Wir erlauben KEIN Speichern von Änderungen über den Viewer
+        // PDFs sind bei uns Read-Only im Viewer
+        return false;
+    }
+
+    public override bool IsValidUrl(string url)
+    {
+        // Prüfen ob URL dem Format entspricht: "invoice-{id}"
+        return url.StartsWith("invoice-", StringComparison.OrdinalIgnoreCase);
+    }
+
+    public override byte[] GetData(string url)
+    {
+        try
+        {
+            _logger.LogDebug("GetData aufgerufen für URL: {Url}", url);
+
+            // URL-Format: "invoice-123" → ID extrahieren
+            if (!url.StartsWith("invoice-", StringComparison.OrdinalIgnoreCase))
+            {
+                _logger.LogWarning("Ungültige URL: {Url}", url);
+                return Array.Empty<byte>();
+            }
+
+            var idString = url.Substring("invoice-".Length);
+            if (!int.TryParse(idString, out var invoiceId))
+            {
+                _logger.LogWarning("Ungültige Invoice-ID in URL: {Url}", url);
+                return Array.Empty<byte>();
+            }
+
+            // Rechnung aus Datenbank laden
+            var invoice = _db.ZugferdInvoices
+                .AsNoTracking()
+                .FirstOrDefault(i => i.Id == invoiceId);
+
+            if (invoice == null)
+            {
+                _logger.LogWarning("Rechnung mit ID {Id} nicht gefunden.", invoiceId);
+                return Array.Empty<byte>();
+            }
+
+            // Prüfen ob ResultFilePath existiert
+            if (string.IsNullOrEmpty(invoice.ResultFilePath))
+            {
+                _logger.LogWarning(
+                    "Rechnung {Id} hat keine Result-PDF (ResultFilePath ist leer).",
+                    invoiceId);
+                return Array.Empty<byte>();
+            }
+
+            // Datei vom Dateisystem laden
+            if (!File.Exists(invoice.ResultFilePath))
+            {
+                _logger.LogError(
+                    "Result-PDF-Datei nicht gefunden: {Path}",
+                    invoice.ResultFilePath);
+                return Array.Empty<byte>();
+            }
+
+            var pdfBytes = File.ReadAllBytes(invoice.ResultFilePath);
+
+            _logger.LogInformation(
+                "Result-PDF geladen: Invoice {Id}, Größe: {Size} Bytes",
+                invoiceId,
+                pdfBytes.Length);
+
+            return pdfBytes;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Fehler beim Laden der PDF für URL: {Url}", url);
+            return Array.Empty<byte>();
+        }
+    }
+
+    public override Dictionary<string, string> GetUrls()
+    {
+        // Diese Methode wird verwendet um eine Liste aller verfügbaren Reports zu liefern
+        // Für unseren Use-Case nicht benötigt (wir laden immer spezifisch eine Invoice)
+        return new Dictionary<string, string>();
+    }
+
+    public override void SetData(XtraReport report, string url)
+    {
+        // Nicht implementiert - wir erlauben kein Speichern über den Viewer
+        throw new NotSupportedException(
+            "Das Speichern von Reports über den Document Viewer ist nicht unterstützt.");
+    }
+
+    public override string SetNewData(XtraReport report, string defaultUrl)
+    {
+        // Nicht implementiert - wir erstellen keine neuen Reports über den Viewer
+        throw new NotSupportedException(
+            "Das Erstellen neuer Reports über den Document Viewer ist nicht unterstützt.");
+    }
+}
\ No newline at end of file
diff --git a/DXApp.TemplateKitProject/Program.cs b/DXApp.TemplateKitProject/Program.cs
index 3e4a6af..14ce1b5 100644
--- a/DXApp.TemplateKitProject/Program.cs
+++ b/DXApp.TemplateKitProject/Program.cs
@@ -1,11 +1,19 @@
 using DXApp.TemplateKitProject.Data;
+using DXApp.TemplateKitProject.DevExpressExtensions;
 using DXApp.TemplateKitProject.Services;
 using Microsoft.EntityFrameworkCore;
+using DevExpress.AspNetCore;
+using DevExpress.AspNetCore.Reporting;
+using DevExpress.XtraReports.Web.Extensions;
 
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddRazorPages();
 
+// DevExpress Controls und Reporting Services
+builder.Services.AddDevExpressControls();
+builder.Services.AddScoped<ReportStorageWebExtension, CustomReportStorageWebExtension>();
+
 // Datenbank
 var connectionString = builder.Configuration.GetConnectionString("EcmContext")
     ?? throw new InvalidOperationException("Connection string 'EcmContext' not found.");
@@ -30,12 +38,18 @@ if (!app.Environment.IsDevelopment())
 
 app.UseHttpsRedirection();
 
-// MIME-Types für PDF.js registrieren (einmaliger UseStaticFiles-Aufruf)
+// MIME-Types für PDF.js UND DevExpress registrieren
 var provider = new Microsoft.AspNetCore.StaticFiles.FileExtensionContentTypeProvider();
 provider.Mappings[".mjs"] = "text/javascript";
 provider.Mappings[".ftl"] = "text/plain";
+provider.Mappings[".woff2"] = "font/woff2";
+provider.Mappings[".woff"] = "font/woff";
+
 app.UseStaticFiles(new StaticFileOptions { ContentTypeProvider = provider });
 
+// DevExpress Middleware
+app.UseDevExpressControls();
+
 app.UseRouting();
 app.UseAuthorization();
 app.MapRazorPages();