language version degraded to 9.0

Billing.Shared/App.cs

@@ -3,8 +3,8 @@ using Billing.Themes;
 using Xamarin.Essentials;
 using Xamarin.Forms;
 
-namespace Billing;
+namespace Billing
-
+{
     public class App : Application
     {
         public static AppTheme CurrentTheme { get; private set; }
@@ -59,3 +59,4 @@ public class App : Application
             Resources = instance;
         }
     }
+}

Billing.Shared/Helper.cs

@@ -1,7 +1,7 @@
 using System;
 
-namespace Billing;
+namespace Billing
-
+{
     internal static class Helper
     {
         public static void Debug(string message)
@@ -21,3 +21,4 @@ internal static class Helper
             System.Diagnostics.Debug.Fail($"[{time}] - {category}", message);
         }
     }
+}

Billing.Shared/Languages/Resource.cs

@@ -36,7 +36,7 @@ namespace Billing.Languages
             {
                 get
                 {
-                    if (strings?.TryGetValue(key, out string val) == true)
+                    if (strings != null && strings.TryGetValue(key, out string val))
                     {
                         return val;
                     }

Billing.Shared/MainShell.xaml.cs

@@ -1,7 +1,7 @@
 using Xamarin.Forms;
 
-namespace Billing;
+namespace Billing
-
+{
     public partial class MainShell : Shell
     {
         public MainShell()
@@ -9,3 +9,4 @@ public partial class MainShell : Shell
             InitializeComponent();
         }
     }
+}

Billing.Shared/Models/Account.cs

@@ -1,7 +1,7 @@
 using System.Xml.Linq;
 
-namespace Billing.Models;
+namespace Billing.Models
-
+{
     public class Account : BaseModel
     {
         public int Id { get; set; }
@@ -39,3 +39,4 @@ public enum AccountCategory
         DebitCard,
         ElecAccount
     }
+}

Billing.Shared/Models/BaseModel.cs

@@ -5,8 +5,8 @@ using System.Linq;
 using System.Text;
 using System.Xml.Linq;
 
-namespace Billing.Models;
+namespace Billing.Models
-
+{
     public interface IModel
     {
         void OnXmlSerialize(XElement node);
@@ -182,3 +182,4 @@ public abstract class BaseModel : IModel, IDisposable
             }
         }
     }
+}

Billing.Shared/Models/Billing.cs

@@ -1,8 +1,8 @@
 using System;
 using System.Xml.Linq;
 
-namespace Billing.Models;
+namespace Billing.Models
-
+{
     public class Billing : BaseModel
     {
         public decimal Amount { get; set; }
@@ -32,3 +32,4 @@ public class Billing : BaseModel
             Write(node, nameof(CreateTime), CreateTime);
         }
     }
+}

Billing.Shared/Models/Category.cs

@@ -1,7 +1,7 @@
 using System.Xml.Linq;
 
-namespace Billing.Models;
+namespace Billing.Models
-
+{
     public class Category : BaseModel
     {
         public int Id { get; set; }
@@ -32,3 +32,4 @@ public class Category : BaseModel
             }
         }
     }
+}

Billing.Shared/Themes/BaseTheme.cs

@@ -1,8 +1,8 @@
 using Billing.UI;
 using Xamarin.Forms;
 
-namespace Billing.Themes;
+namespace Billing.Themes
-
+{
     public abstract class BaseTheme : ResourceDictionary
     {
         public const string CascadiaFontRegular = nameof(CascadiaFontRegular);
@@ -74,3 +74,4 @@ public abstract class BaseTheme : ResourceDictionary
             });
         }
     }
+}

Billing.Shared/Themes/Dark.cs

@@ -1,8 +1,7 @@
-using Billing.UI;
+using Xamarin.Forms;
-using Xamarin.Forms;
-
-namespace Billing.Themes;
 
+namespace Billing.Themes
+{
     public class Dark : BaseTheme
     {
         private static Dark _instance;
@@ -48,3 +47,4 @@ public class Dark : BaseTheme
             });
         }
     }
+}

Billing.Shared/Themes/Light.cs

@@ -1,8 +1,7 @@
-using Billing.UI;
+using Xamarin.Forms;
-using Xamarin.Forms;
-
-namespace Billing.Themes;
 
+namespace Billing.Themes
+{
     public class Light : BaseTheme
     {
         private static Light _instance;
@@ -48,3 +47,4 @@ public class Light : BaseTheme
             });
         }
     }
+}

Billing.Shared/UI/BillingDate.xaml.cs

@@ -1,8 +1,8 @@
 using System;
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public partial class BillingDate : ContentView
     {
         #region UI Properties
@@ -287,3 +287,4 @@ public class BillingDay : BindableObject
             }
         }
     }
+}

Billing.Shared/UI/BillingPage.cs

@@ -1,8 +1,8 @@
 using Billing.Themes;
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public abstract class BillingPage : ContentPage
     {
         public BillingPage()
@@ -10,3 +10,4 @@ public abstract class BillingPage : ContentPage
             SetDynamicResource(BackgroundColorProperty, BaseTheme.WindowBackgroundColor);
         }
     }
+}

Billing.Shared/UI/Converters.cs

@@ -3,8 +3,8 @@ using System;
 using System.Globalization;
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public class TitleDateConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
@@ -38,3 +38,4 @@ public class MoneyConverter : IValueConverter
             return value;
         }
     }
+}

Billing.Shared/UI/CustomControl.cs

@@ -2,8 +2,8 @@
 using System;
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public class TintImage : Image
     {
         public static readonly BindableProperty PrimaryColorProperty = BindableProperty.Create(nameof(PrimaryColor), typeof(Color?), typeof(TintImage));
@@ -152,3 +152,4 @@ public class OptionEntryCell : OptionCell
         .DynamicResource(Entry.PlaceholderColorProperty, BaseTheme.SecondaryTextColor)
         .DynamicResource(VisualElement.BackgroundColorProperty, BaseTheme.OptionTintColor);
     }
+}

Billing.Shared/UI/CustomEffect.cs

@@ -1,7 +1,7 @@
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public class ShadowEffect : RoutingEffect
     {
         public float Radius { get; set; }
@@ -13,3 +13,4 @@ public class ShadowEffect : RoutingEffect
         {
         }
     }
+}

Billing.Shared/UI/Definition.cs

@@ -1,8 +1,8 @@
 using System;
 using Xamarin.Forms;
 
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public static partial class Definition
     {
         public static partial string GetCascadiaRegularFontFamily();
@@ -66,3 +66,4 @@ public class Tap : IDisposable
             }
         }
     }
+}

Billing.Shared/Views/AccountPage.xaml.cs

@@ -1,9 +1,8 @@
 using Billing.UI;
-using System;
 using Xamarin.Forms;
 
-namespace Billing.Views;
+namespace Billing.Views
-
+{
     public partial class AccountPage : BillingPage
     {
         private static readonly BindableProperty BalanceProperty = BindableProperty.Create(nameof(Balance), typeof(decimal), typeof(AccountPage));
@@ -42,3 +41,4 @@ public partial class AccountPage : BillingPage
             Helper.Debug(e.Account.ToString());
         }
     }
+}

Billing.Shared/Views/AddAccountPage.xaml.cs

@@ -3,8 +3,8 @@ using Billing.UI;
 using System;
 using Xamarin.Forms;
 
-namespace Billing.Views;
+namespace Billing.Views
-
+{
     public partial class AddAccountPage : BillingPage
     {
         private static readonly BindableProperty AccountNameProperty = BindableProperty.Create(nameof(AccountName), typeof(string), typeof(AddAccountPage));
@@ -84,3 +84,4 @@ public class AccountEventArgs : EventArgs
     {
         public Account Account { get; set; }
     }
+}

Billing.Shared/Views/AddBillPage.xaml.cs

@@ -1,7 +1,7 @@
 using Billing.UI;
 
-namespace Billing.Views;
+namespace Billing.Views
-
+{
     public partial class AddBillPage : BillingPage
     {
         public AddBillPage()
@@ -9,3 +9,4 @@ public partial class AddBillPage : BillingPage
             InitializeComponent();
         }
     }
+}

Billing.Shared/Views/BillPage.xaml.cs

@@ -2,8 +2,8 @@ using Billing.UI;
 using System;
 using Xamarin.Forms;
 
-namespace Billing.Views;
+namespace Billing.Views
-
+{
     public partial class BillPage : BillingPage
     {
         private static readonly BindableProperty SelectedDateProperty = BindableProperty.Create(nameof(SelectedDate), typeof(DateTime), typeof(BillPage));
@@ -42,3 +42,4 @@ public partial class BillPage : BillingPage
             await Navigation.PushAsync(new AddBillPage());
         }
     }
+}

Billing.Shared/Views/SettingPage.xaml.cs

@@ -1,7 +1,7 @@
 using Billing.UI;
 
-namespace Billing.Views;
+namespace Billing.Views
-
+{
     public partial class SettingPage : BillingPage
     {
         public SettingPage()
@@ -9,3 +9,4 @@ public partial class SettingPage : BillingPage
             InitializeComponent();
         }
     }
+}

Billing/Billing.Android/Billing.Android.csproj

@@ -16,14 +16,13 @@
     <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
     <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
     <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
-    <AndroidUseLatestPlatformSdk>false</AndroidUseLatestPlatformSdk>
     <TargetFrameworkVersion>v12.0</TargetFrameworkVersion>
     <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
     <AndroidUseAapt2>true</AndroidUseAapt2>
     <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
     <NuGetPackageImportStamp>
     </NuGetPackageImportStamp>
-    <LangVersion>10.0</LangVersion>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -65,8 +64,8 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2196" />
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2337" />
-    <PackageReference Include="Xamarin.Essentials" Version="1.7.0" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.7.1" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Definition.cs" />

Billing/Billing.iOS/AppDelegate.cs

@@ -1,8 +1,8 @@
 using Foundation;
 using UIKit;
 
-namespace Billing.iOS;
+namespace Billing.iOS
-
+{
     // The UIApplicationDelegate for the application. This class is responsible for launching the 
     // User Interface of the application, as well as listening (and optionally responding) to 
     // application events from iOS.
@@ -24,3 +24,4 @@ public partial class AppDelegate : Xamarin.Forms.Platform.iOS.FormsApplicationDe
             return base.FinishedLaunching(app, options);
         }
     }
+}

Billing/Billing.iOS/Billing.iOS.csproj

@@ -15,7 +15,7 @@
     <MtouchEnableSGenConc>true</MtouchEnableSGenConc>
     <MtouchHttpClientHandler>NSUrlSessionHandler</MtouchHttpClientHandler>
     <ProvisioningType>automatic</ProvisioningType>
-    <LangVersion>10.0</LangVersion>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
     <DebugSymbols>true</DebugSymbols>
@@ -138,8 +138,8 @@
     <Reference Include="System.Numerics.Vectors" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2196" />
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2337" />
-    <PackageReference Include="Xamarin.Essentials" Version="1.7.0" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.7.1" />
   </ItemGroup>
   <ItemGroup>
     <BundleResource Include="Resources\bars.png" />

Billing/Billing.iOS/Definition.cs

@@ -1,5 +1,5 @@
-namespace Billing.UI;
+namespace Billing.UI
-
+{
     public static partial class Definition
     {
         public static partial string GetCascadiaRegularFontFamily() => "CascadiaCode-Regular";
@@ -7,3 +7,4 @@ public static partial class Definition
         public static partial string GetRobotoCondensedRegularFontFamily() => "RobotoCondensed-Regular";
         public static partial string GetRobotoCondensedBoldFontFamily() => "RobotoCondensed-Bold";
     }
+}

Billing/Billing.iOS/Effects/ShadowEffectPlatform.cs

@@ -7,8 +7,8 @@ using Xamarin.Forms.Platform.iOS;
 
 [assembly: ResolutionGroupName("Org.Tsanie")]
 [assembly: ExportEffect(typeof(ShadowEffectPlatform), nameof(ShadowEffect))]
-namespace Billing.iOS.Effects;
+namespace Billing.iOS.Effects
-
+{
     public class ShadowEffectPlatform : PlatformEffect
     {
         protected override void OnAttached()
@@ -41,3 +41,4 @@ public class ShadowEffectPlatform : PlatformEffect
             }
         }
     }
+}

Billing/Billing.iOS/Main.cs

@@ -1,7 +1,7 @@
 using UIKit;
 
-namespace Billing.iOS;
+namespace Billing.iOS
-
+{
     public class Application
     {
         // This is the main entry point of the application.
@@ -12,3 +12,4 @@ public class Application
             UIApplication.Main(args, null, typeof(AppDelegate));
         }
     }
+}

Billing/Billing.iOS/PlatformCulture.cs

@@ -4,8 +4,8 @@ using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Threading;
 
-namespace Billing.Languages;
+namespace Billing.Languages
-
+{
     public partial class PlatformCulture
     {
         public partial string GetNamespace()
@@ -73,3 +73,4 @@ public partial class PlatformCulture
             return netLanguage;
         }
     }
+}

Billing/Billing.iOS/Renderers/LongPressButtonRenderer.cs

@@ -5,8 +5,8 @@ using Xamarin.Forms;
 using Xamarin.Forms.Platform.iOS;
 
 [assembly: ExportRenderer(typeof(LongPressButton), typeof(LongPressButtonRenderer))]
-namespace Billing.iOS.Renderers;
+namespace Billing.iOS.Renderers
-
+{
     public class LongPressButtonRenderer : ButtonRenderer
     {
         private UILongPressGestureRecognizer longGesture;
@@ -41,3 +41,4 @@ public class LongPressButtonRenderer : ButtonRenderer
             }
         }
     }
+}

Billing/Billing.iOS/Renderers/OptionEntryRenderer.cs

@@ -5,8 +5,8 @@ using Xamarin.Forms;
 using Xamarin.Forms.Platform.iOS;
 
 [assembly: ExportRenderer(typeof(OptionEntry), typeof(OptionEntryRenderer))]
-namespace Billing.iOS.Renderers;
+namespace Billing.iOS.Renderers
-
+{
     public class OptionEntryRenderer : EntryRenderer
     {
         protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
@@ -20,3 +20,4 @@ public class OptionEntryRenderer : EntryRenderer
             }
         }
     }
+}

Billing/Billing.iOS/Renderers/TintImageRenderer.cs

@@ -5,8 +5,8 @@ using Xamarin.Forms;
 using Xamarin.Forms.Platform.iOS;
 
 [assembly: ExportRenderer(typeof(TintImage), typeof(TintImageRenderer))]
-namespace Billing.iOS.Renderers;
+namespace Billing.iOS.Renderers
-
+{
     public class TintImageRenderer : ImageRenderer
     {
 
@@ -29,3 +29,4 @@ public class TintImageRenderer : ImageRenderer
             }
         }
     }
+}