fix xamarin location values when saving the settings with double type

src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml

@@ -111,6 +111,7 @@
             <converters:WebNavigatingEventArgsConverter x:Key="WebNavigatingEventArgsConverter" />
             <converters:WebNavigatedEventArgsConverter x:Key="WebNavigatedEventArgsConverter" />
             <converters:StringNullOrEmptyBoolConverter x:Key="StringNullOrEmptyBoolConverter" />
+            <converters:DoubleConverter x:Key="DoubleConverter" />
 
             <!-- STYLES -->
             <Style x:Key="ValidationErrorLabelStyle"

src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using eShopOnContainers.Core.Helpers;
 using eShopOnContainers.Services;
 using eShopOnContainers.Core.ViewModels.Base;
@@ -79,8 +80,8 @@ namespace eShopOnContainers
 
                 var position = await locator.GetPositionAsync();
 
-                Settings.Latitude = position.Latitude;
+                Settings.Latitude = position.Latitude.ToString();
-                Settings.Longitude = position.Longitude;
+                Settings.Longitude = position.Longitude.ToString();
             }
             else
             {
@@ -92,8 +93,8 @@ namespace eShopOnContainers
         {
             var location = new Location
             {
-                Latitude = Settings.Latitude,
+                Latitude = double.Parse(Settings.Latitude, CultureInfo.InvariantCulture),
-                Longitude = Settings.Longitude
+                Longitude = double.Parse(Settings.Longitude, CultureInfo.InvariantCulture)
             };
 
             var locationService = ViewModelLocator.Resolve<ILocationService>();

src/Mobile/eShopOnContainers/eShopOnContainers.Core/Converters/DoubleConverter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Globalization;
+using Xamarin.Forms;
+
+namespace eShopOnContainers.Core.Converters
+{
+    public class DoubleConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is double)
+                return value.ToString();
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            double doub;
+            if (double.TryParse(value as string, out doub))
+                return doub;
+            return value;
+        }
+    }
+}

src/Mobile/eShopOnContainers/eShopOnContainers.Core/Helpers/Settings.cs

@@ -69,16 +69,16 @@ namespace eShopOnContainers.Core.Helpers
             set => AppSettings.AddOrUpdateValue<bool>(IdUseFakeLocation, value);
         }
 
-        public static double Latitude
+        public static string Latitude
         {
-            get => AppSettings.GetValueOrDefault<double>(IdLatitude, FakeLatitudeDefault);
+            get => AppSettings.GetValueOrDefault<string>(IdLatitude, FakeLatitudeDefault.ToString());
-            set => AppSettings.AddOrUpdateValue<double>(IdLatitude, value);
+            set => AppSettings.AddOrUpdateValue<string>(IdLatitude, value);
         }
 
-        public static double Longitude
+        public static string Longitude
         {
-            get => AppSettings.GetValueOrDefault<double>(IdLongitude, FakeLongitudeDefault);
+            get => AppSettings.GetValueOrDefault<string>(IdLongitude, FakeLongitudeDefault.ToString());
-            set => AppSettings.AddOrUpdateValue<double>(IdLongitude, value);
+            set => AppSettings.AddOrUpdateValue<string>(IdLongitude, value);
         }
 
         public static bool AllowGpsLocation

src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/SettingsViewModel.cs

@@ -1,4 +1,6 @@
-namespace eShopOnContainers.Core.ViewModels
+using System.Globalization;
+
+namespace eShopOnContainers.Core.ViewModels
 {
     using System.Windows.Input;
     using Xamarin.Forms;
@@ -34,8 +36,8 @@
 
             _useAzureServices = !Settings.UseMocks;
             _endpoint = Settings.UrlBase;
-            _latitude = Settings.Latitude;
+            _latitude = double.Parse(Settings.Latitude, CultureInfo.CurrentCulture);
-            _longitude = Settings.Longitude;
+            _longitude = double.Parse(Settings.Longitude, CultureInfo.CurrentCulture);
             _useFakeLocation = Settings.UseFakeLocation;
             _allowGpsLocation = Settings.AllowGpsLocation;
             _gpsWarningMessage = string.Empty;
@@ -325,13 +327,13 @@
         private void UpdateLatitude()
         {
             // Update fake latitude (save to local storage)
-            Settings.Latitude = _latitude;
+            Settings.Latitude = _latitude.ToString();
         }
 
         private void UpdateLongitude()
         {
             // Update fake longitude (save to local storage)
-            Settings.Longitude = _longitude;
+            Settings.Longitude = _longitude.ToString();
         }
 
         private void UpdateAllowGpsLocation()

src/Mobile/eShopOnContainers/eShopOnContainers.Core/Views/SettingsView.xaml

@@ -219,7 +219,7 @@
                             Text="Latitude"
                             Style="{StaticResource HeaderLabelStyle}"/>
                         <Entry
-                            Text="{Binding Latitude, Mode=TwoWay}"
+                            Text="{Binding Latitude, Mode=TwoWay, Converter={StaticResource DoubleConverter}}"
                             Keyboard="Text">
                             <Entry.Style>
                                 <OnPlatform 
@@ -233,7 +233,7 @@
                             Text="Longitude"
                             Style="{StaticResource HeaderLabelStyle}"/>
                         <Entry
-                            Text="{Binding Longitude, Mode=TwoWay}"
+                            Text="{Binding Longitude, Mode=TwoWay, Converter={StaticResource DoubleConverter}}"
                             Keyboard="Text">
                             <Entry.Style>
                                 <OnPlatform 

src/Mobile/eShopOnContainers/eShopOnContainers.Core/eShopOnContainers.Core.csproj

@@ -49,6 +49,7 @@
     </Compile>
     <Compile Include="Controls\CustomTabbedPage.cs" />
     <Compile Include="Controls\ToggleButton.cs" />
+    <Compile Include="Converters\DoubleConverter.cs" />
     <Compile Include="Converters\StringNullOrEmptyBoolConverter.cs" />
     <Compile Include="Converters\CountToBoolConverter.cs" />
     <Compile Include="Converters\DatetimeConverter.cs" />