viewmodels, uis, ecc.

Converters/BooleanInvertConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace HashCalculator.GUI.Converters
+{
+    [ValueConversion(typeof(bool), typeof(bool))]
+    internal class BooleanInvertConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            bool original = (bool)value;
+            return !original;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            bool original = (bool)value;
+            return !original;
+        }
+    }
+}

Converters/NullToBooleanConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace HashCalculator.GUI.Converters
+{
+    [ValueConversion(typeof(object), typeof(bool))]
+    public class NullToBooleanConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if(value is null)
+            {
+                return false;
+            }
+            else if(value is string s)
+            {
+                return !string.IsNullOrEmpty(s);
+            }
+            return true;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Converters/ValidInputEntryTypeToBooleanConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace HashCalculator.GUI.Converters
+{
+    [ValueConversion(typeof(InputEntry), typeof(bool))]
+    internal class ValidInputEntryTypeToBooleanConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var entry = value as InputEntry;
+            return entry?.IsValid == true;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Converters/ValueConverterAggregate.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+
+namespace HashCalculator.GUI.Converters
+{
+    internal class ValueConverterAggregate : List<IValueConverter>, IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return this.Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, culture));
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}