Use Arrays insted of Lists for better performance

src/MistoxWebsite.Server/Controllers/ProductController.cs

@@ -9,7 +9,7 @@ namespace MistoxWebsite.Server.Controllers {
 
         DatabaseService _databaseService;
 
-        public static List<Product> CatalogItems = new List<Product>();
+        public static Product[] CatalogItems = [];
 
         public ProductController( DatabaseService databaseService ) {
             _databaseService = databaseService;
@@ -114,8 +114,8 @@ namespace MistoxWebsite.Server.Controllers {
                     if( !string.IsNullOrEmpty( email ) ) {
                         Account? test = await _databaseService.GetAccount(email);
                         if( test != null ) {
-                            List<Receipt> returned = await _databaseService.GetAllReceipts(test);
-                            return returned.ToArray();
+                            Receipt[] returned = await _databaseService.GetAllReceipts(test);
+                            return returned;
                         }
                     }
                 }
@@ -145,7 +145,7 @@ namespace MistoxWebsite.Server.Controllers {
                     if( !string.IsNullOrEmpty( email ) ) {
                         Account? user = await _databaseService.GetAccount(email);
                         if (user != null){
-                            List<Product>? games = await _databaseService.GetAllProducts();
+                            Product[] games = await _databaseService.GetAllProducts();
                             foreach( Product product in games ) {
                                 if ( contains( Product, product.URL ) ) {
                                     Receipt? receipt = await _databaseService.GetReceipt(user, product);
@@ -175,13 +175,14 @@ namespace MistoxWebsite.Server.Controllers {
         }
 
         public static async Task HotReload( DatabaseService ds ) {
-            CatalogItems = new List<Product>();
             try {
                 CatalogItems = await ds.GetAllProducts();
             } catch {
-                CatalogItems.Add( new Product() { ID = 0, Name = "offline prod1", Cost = 100, Description = "offline desc" } );
-                CatalogItems.Add( new Product() { ID = 1, Name = "offline prod2", Cost = 100, Description = "offline desc" } );
-                CatalogItems.Add( new Product() { ID = 2, Name = "offline prod3", Cost = 100, Description = "offline desc" } );
+                CatalogItems = new Product[]{
+                    new Product() { ID = 0, Name = "offline prod1", Cost = 100, Description = "offline desc" },
+                    new Product() { ID = 1, Name = "offline prod2", Cost = 100, Description = "offline desc" },
+                    new Product() { ID = 2, Name = "offline prod3", Cost = 100, Description = "offline desc" }
+                };
             };
         }
 

src/MistoxWebsite.Server/Services/DatabaseService/AccountInventory.cs

@@ -9,7 +9,7 @@ using System.Data.Common;
 namespace MistoxWebsite.Server.Services.DatabaseService {
     public partial class DatabaseService {
 
-        public async Task<List<UserInventory>> GetInventory( Account account, Product product ) {
+        public async Task<UserInventory[]> GetInventory( Account account, Product product ) {
             List<UserInventory> list = new List<UserInventory>();
             using( MySqlConnection connection = GetConnection() ) {
                 connection.Open();
@@ -40,7 +40,7 @@ namespace MistoxWebsite.Server.Services.DatabaseService {
                     }
                 }
             }
-            return list;
+            return list.ToArray();
         }
 
         async Task UpdateInventory( MySqlConnection connection, AccountInventory item ) {

src/MistoxWebsite.Server/Services/DatabaseService/Receipt.cs

@@ -6,7 +6,7 @@ using System.Data.Common;
 namespace MistoxWebsite.Server.Services.DatabaseService {
     public partial class DatabaseService {
 
-        public async Task<List<Receipt>> GetAllReceipts( Account account ) {
+        public async Task<Receipt[]> GetAllReceipts( Account account ) {
             List<Receipt> receipts = new List<Receipt> ();
             using( MySqlConnection connection = GetConnection() ) {
                 connection.Open();
@@ -43,10 +43,10 @@ namespace MistoxWebsite.Server.Services.DatabaseService {
                     }
                 }
             }
-            return receipts;
+            return receipts.ToArray();
         }
 
-        public async Task<List<( Receipt, Product )>> GetAllReceiptsJoinedToProduct( Account account ) {
+        public async Task<( Receipt, Product )[]> GetAllReceiptsJoinedToProduct( Account account ) {
             List<( Receipt, Product )> join = new();
             using( MySqlConnection connection = GetConnection() ) {
                 connection.Open();
@@ -100,7 +100,7 @@ namespace MistoxWebsite.Server.Services.DatabaseService {
                     }
                 }
             }
-            return join;
+            return join.ToArray();
         }
 
         public async Task<Receipt?> GetReceipt( Account account, Product game ) {