mig 4

Webshop.Application/DTOs/Products/UpdateAdminProductDto.cs

@@ -36,6 +36,6 @@ namespace Webshop.Application.DTOs.Products
         public bool IsFeatured { get; set; }
         public int FeaturedDisplayOrder { get; set; }
 
-        public byte[]? RowVersion { get; set; }
+        public string? RowVersion { get; set; }
     }
 }

Webshop.Application/Services/Admin/AdminProductService.cs

@@ -120,12 +120,39 @@ namespace Webshop.Application.Services.Admin
                 return ServiceResult.Fail(ServiceResultType.NotFound, $"Produkt mit ID '{productDto.Id}' nicht gefunden.");
             }
 
-            // SCHRITT 2: Setze SOFORT den Concurrency Token am "sauberen" Objekt.
+            // --- CONCURRENCY CHECK ---
-            if (productDto.RowVersion != null && productDto.RowVersion.Length > 0)
+            if (!string.IsNullOrEmpty(productDto.RowVersion))
             {
-                _context.Entry(existingProduct).Property(p => p.RowVersion).OriginalValue = productDto.RowVersion;
+                try
+                {
+                    // <<<<<< WICHTIGE KORREKTUR HIER >>>>>>
+                    // FormData wandelt "+" oft in " " um. Das reparieren wir hier:
+                    string fixedRowVersion = productDto.RowVersion.Replace(" ", "+");
+
+                    // 1. Umwandlung von String (Base64) zu Byte-Array
+                    byte[] incomingRowVersion = Convert.FromBase64String(fixedRowVersion);
+
+                    // DEBUG-LOGGING
+                    string dbValue = Convert.ToBase64String(existingProduct.RowVersion ?? new byte[0]);
+
+                    Console.WriteLine($"DB RowVersion:       {dbValue}");
+                    Console.WriteLine($"Frontend RowVersion: {fixedRowVersion}"); // Logge den reparierten Wert
+
+                    if (dbValue != fixedRowVersion)
+                    {
+                        Console.WriteLine("!!! WARNUNG: Versionen stimmen nicht <20>berein !!!");
+                    }
+
+                    // 2. Setze den Originalwert f<>r EF Core
+                    _context.Entry(existingProduct).Property(p => p.RowVersion).OriginalValue = incomingRowVersion;
+                }
+                catch (FormatException)
+                {
+                    return ServiceResult.Fail(ServiceResultType.Failure, "RowVersion Format ist ung<6E>ltig.");
+                }
             }
 
+
             // SCHRITT 3: Lade jetzt die Relationen explizit nach.
             await _context.Entry(existingProduct).Collection(p => p.Images).LoadAsync();
             await _context.Entry(existingProduct).Collection(p => p.Productcategories).LoadAsync();

Webshop.Infrastructure/Migrations/20251120143728_rowversion4.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Webshop.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class rowversion4 : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}