converter sample

PacticeSolution/ValueConverterSample/Converter/YesNoToBoolConverter.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace ValueConverterSample.Converter
+{
+    internal class YesNoToBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null)
+                return false;
+
+            switch (value.ToString().ToUpper())
+            {
+                case "YES":
+                    return true;
+                case "NO":
+                    return false;
+                default:
+                    return false;
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is bool))
+                return "NO";
+
+            bool converted = (bool)value;
+            if (converted)
+                return "YES";
+            else
+                return "NO";
+        }
+    }
+}

PacticeSolution/ValueConverterSample/MainWindow.xaml

@@ -4,9 +4,23 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:ValueConverterSample"
+        xmlns:cvt="clr-namespace:ValueConverterSample.Converter"
         mc:Ignorable="d"
-        Title="MainWindow" Height="450" Width="800">
-    <Grid>
+        Title="MainWindow" Height="100" Width="300">
+    <Window.Resources>
+        <cvt:YesNoToBoolConverter x:Key="ynConvert"/>
+    </Window.Resources>
     
-    </Grid>
+    <StackPanel>
+        <TextBox x:Name="tbMain"
+                 Text="YES"/>
+        <StackPanel Orientation="Horizontal">
+            <TextBlock Text="Current value: "/>
+            <TextBlock x:Name="tbCheck"
+                       Text="{Binding ElementName=tbMain, Path=Text, Converter={StaticResource ynConvert}}"/>
+        </StackPanel>
+
+        <CheckBox Content="{Binding ElementName=tbMain, Path=Text}"
+                  IsChecked="{Binding ElementName=tbMain, Path=Text, Converter={StaticResource ynConvert}}"/>
+    </StackPanel>
 </Window>

PacticeSolution/ValueConverterSample/ValueConverterSample.csproj

@@ -62,6 +62,7 @@
       <DependentUpon>App.xaml</DependentUpon>
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="Converter\YesNoToBoolConverter.cs" />
     <Compile Include="MainWindow.xaml.cs">
       <DependentUpon>MainWindow.xaml</DependentUpon>
       <SubType>Code</SubType>