#102: Add sample to show that converters don't work as expected

Author: tom-englert

src/BasicSample/MainWindow.xaml

@@ -31,6 +31,7 @@
             </DataTemplate>
           </DataGridTemplateColumn.CellEditingTemplate>
         </DataGridTemplateColumn>
+        <DataGridTextColumn Header="Converter can't work" Binding="{Binding Index, Converter={basicSample:ModuloConverter}}" />
       </DataGrid.Columns>
     </DataGrid>
   </Grid>

src/BasicSample/ModuloConverter.cs

@@ -0,0 +1,27 @@
+namespace BasicSample
+{
+    using System;
+    using System.Globalization;
+    using System.Windows.Data;using System.Windows.Markup;
+
+    public class ModuloConverter : MarkupExtension, IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is not int index)
+                return null;
+
+            return $"{index % 10}: {value}";
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+    }
+}