pass database from xaml to json

LocalServices/Data/CatastrophicPerformancesDatabase.cs

@@ -5,6 +5,8 @@ using System.Collections.Immutable;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using System.Threading.Tasks;
 
 namespace LocalEndpoint.Data
@@ -62,9 +64,11 @@ namespace LocalEndpoint.Data
             Save(ACCOUNTS_FILENAME, ACCOUNTS_SERIALIZER, accountsData);
         }
 
-        public Recipe GetRecipe(Guid id)
+        public Recipe? GetRecipe(Guid id)
         {
-            return ConvertRecipeDataToRecipe(recipesData[id]);
+            if (recipesData.TryGetValue(id, out RecipeData? data))
+                return ConvertRecipeDataToRecipe(data);
+            return null;
         }
 
         public RecipeRate GetRecipeRate(Guid user, Guid recipe)
@@ -141,19 +145,16 @@ namespace LocalEndpoint.Data
 
             if (fileInfo.Length == 0)
                 return new Dictionary<K, V>(); //file is empty thus there is nothing to deserialize
-            Console.WriteLine(File.ReadAllText(file));
 
-            using (var stream = File.OpenRead(file))
+            string text = File.ReadAllText(file);
-                return deserializer.ReadObject(stream) as Dictionary<K, V> ?? throw new Exception("object read from " + file + " is not a dictionnary");
+
+            return JsonSerializer.Deserialize<Dictionary<K, V>>(text);
         }
 
         private void Save<K, T>(string fileName, DataContractSerializer serializer, Dictionary<K, T> dict)
         {
-            using (var stream = File.OpenWrite(dbPath + "/" + fileName))
+            string json = JsonSerializer.Serialize(dict);
-            {
+            File.WriteAllText(dbPath + "/" + fileName, json);
-                serializer.WriteObject(stream, dict);
-                stream.Flush();
-            }
         }
 
     }

LocalServices/Data/Database.cs

@@ -9,7 +9,7 @@ namespace LocalEndpoint.Data
     public interface Database
     {
 
-        public Recipe GetRecipe(Guid id);
+        public Recipe? GetRecipe(Guid id);
 
         public RecipeRate GetRecipeRate(Guid user, Guid recipe);
 

LocalServices/RecipesService.cs

@@ -21,7 +21,7 @@ namespace LocalEndpoint
             return db.ListAllRecipes().Take(4).ToImmutableList().ConvertAll(v => v.Info);
         }
 
-        public Recipe GetRecipe(RecipeInfo info)
+        public Recipe? GetRecipe(RecipeInfo info)
         {
             return db.GetRecipe(info.Id);
         }

Services/IRecipesService.cs

@@ -8,7 +8,7 @@ namespace Endpoint
     {
         public ImmutableList<RecipeInfo> PopularRecipes();
 
-        public Recipe GetRecipe(RecipeInfo info);
+        public Recipe? GetRecipe(RecipeInfo info);
 
         public IAccountOwnedRecipes GetRecipesOf(Account account);
         public IAccountRecipesPreferences GetPreferencesOf(Account account);

Views/FavoritesPage.xaml.cs

@@ -31,7 +31,7 @@ public partial class FavoritesPage : ContentPage
         {
             RecipeViewLayout.Children.Add(new RecipeView(info, () =>
             {
-                Recipe recipe = service.GetRecipe(info);
+                Recipe? recipe = service.GetRecipe(info);
                 Shell.Current.Navigation.PushAsync(new RecipePage(recipe, notifier, preferences, 1));
             }));
         });