AndreasReitberger · AndreasReitberger · Oct 13, 2025
diff --git a/src/SharedXFormCoreLibrary/Converters/BooleanReverseVisibilityConverter.cs b/src/SharedXFormCoreLibrary/Converters/BooleanReverseVisibilityConverter.cs
@@ -2,13 +2,13 @@
 {
     public sealed class BooleanReverseVisibilityConverter : IValueConverter
     {
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             var returnValue = value is bool visible && !visible;
             return returnValue;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
             //return value is bool visible && visible ? true : false;

diff --git a/src/SharedXFormCoreLibrary/Converters/BooleanVisibilityConverter.cs b/src/SharedXFormCoreLibrary/Converters/BooleanVisibilityConverter.cs
@@ -3,12 +3,12 @@
     public sealed class BooleanVisibilityConverter : IValueConverter
     {
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             return value is bool visible && visible;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
             //return value is bool visible && !visible;

diff --git a/src/SharedXFormCoreLibrary/Converters/BrushToBlackWhiteConverter.cs b/src/SharedXFormCoreLibrary/Converters/BrushToBlackWhiteConverter.cs
@@ -5,7 +5,7 @@ public sealed class BrushToBlackWhiteConverter : IValueConverter
         public Color White { get; set; } = Color.White;
         public Color Black { get; set; } = Color.Black;
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             Color opposite = Color.Black;
             if (value is SolidColorBrush color)
@@ -17,7 +17,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             return opposite;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/BrushToLightForgroundConverter.cs b/src/SharedXFormCoreLibrary/Converters/BrushToLightForgroundConverter.cs
@@ -6,7 +6,7 @@
     public sealed class BrushToLightForgroundConverter : IValueConverter
     {
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             if (value is SolidColorBrush color)
             {
@@ -16,7 +16,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             return false;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/ColorToBlackWhiteConverter.cs b/src/SharedXFormCoreLibrary/Converters/ColorToBlackWhiteConverter.cs
@@ -3,7 +3,7 @@
     public sealed class ColorToBlackWhiteConverter : IValueConverter
     {
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             Color opposite = Color.Black;
             if (value is Color color)
@@ -14,7 +14,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             return opposite;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/ColorToLightForgroundConverter.cs b/src/SharedXFormCoreLibrary/Converters/ColorToLightForgroundConverter.cs
@@ -8,7 +8,7 @@ namespace AndreasReitberger.Shared.XForm.Core.Converters
     public sealed class ColorToLightForgroundConverter : IValueConverter
     {
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             if (value is Color color)
             {
@@ -18,7 +18,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             return false;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/ColorToStringConverter.cs b/src/SharedXFormCoreLibrary/Converters/ColorToStringConverter.cs
@@ -2,7 +2,7 @@
 {
     public sealed class ColorToStringConverter : IValueConverter
     {
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             if (value is Color color)
             {
@@ -11,7 +11,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             return string.Empty;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/DoubleHoursToTimeSpanConverter.cs b/src/SharedXFormCoreLibrary/Converters/DoubleHoursToTimeSpanConverter.cs
@@ -2,7 +2,7 @@
 {
     public sealed class DoubleHoursToTimeSpanConverter : IValueConverter
     {
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             try
             {
@@ -15,9 +15,9 @@
             }
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             TimeSpan ts = (TimeSpan)value;
             if (ts == null)
                return 0;
            return ts.TotalHours;

diff --git a/src/SharedXFormCoreLibrary/Converters/IsMoreThanConverter.cs b/src/SharedXFormCoreLibrary/Converters/IsMoreThanConverter.cs
@@ -3,13 +3,13 @@
     public sealed class IsMoreThanConverter : IValueConverter
     {
         public double Limit { get; set; } = 0;
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             double val = System.Convert.ToDouble(value);
             double limit = parameter != null ? System.Convert.ToDouble(parameter) : Limit;
             return (val > limit);
         }
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/LongToGigaByteConverter.cs b/src/SharedXFormCoreLibrary/Converters/LongToGigaByteConverter.cs
@@ -3,15 +3,15 @@
     public sealed class LongToGigaByteConverter : IValueConverter
     {
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             long bytes = System.Convert.ToInt64(value);
             double factor = 1073741824;
             double gigaBytes = (double)Math.Round((double)(bytes / factor), 2);
             return gigaBytes;
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/SwipingBoolToImageConverter.cs b/src/SharedXFormCoreLibrary/Converters/SwipingBoolToImageConverter.cs
@@ -2,15 +2,15 @@
 {
     public class SwipingBoolToImageConverter : IValueConverter
     {
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             if ((bool)value)
                 return ImageSource.FromResource("SfListViewSample.Images.Favorites1.png");
             else
                 return ImageSource.FromResource("SfListViewSample.Images.InboxIcon.png");
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/UnixDateToDateTimeConverter.cs b/src/SharedXFormCoreLibrary/Converters/UnixDateToDateTimeConverter.cs
@@ -3,7 +3,7 @@
     // Source: https://github.com/AndreasReitberger/SharedMauiCoreLibrary/blob/main/source/SharedMauiCoreLibrary/SharedMauiCoreLibrary/Converters/UnixDateToDateTimeConverter.cs
     public sealed class UnixDateToDateTimeConverter : IValueConverter
     {
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             try
             {
@@ -18,7 +18,7 @@ public object Convert(object value, Type targetType, object parameter, CultureIn
             }
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             throw new NotImplementedException();
         }

diff --git a/src/SharedXFormCoreLibrary/Converters/UnixDoubleHoursToTimeSpanConverter.cs b/src/SharedXFormCoreLibrary/Converters/UnixDoubleHoursToTimeSpanConverter.cs
@@ -4,7 +4,7 @@
     public sealed class UnixDoubleHoursToTimeSpanConverter : IValueConverter
     {
         public bool WithMiliSeconds { get; set; } = false;
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             try
             {
@@ -19,9 +19,9 @@
             }
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
         {
             TimeSpan ts = (TimeSpan)value;
             return ts.TotalSeconds;
        }
    }