WPF Converter Example

WPF > Data > Converters

Converters changes data from one type to another and apply custom logic to binding.

Implementation : create a class that implements the IvalueConverter.

Example:

XAML:

<Window x:Class="WpfApplication2.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WpfApplication2"

        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>

        <local:YesNoConverter x:Key="YesNoConverter" />

    </Window.Resources>

    <StackPanel Margin="5">

        <CheckBox x:Name="chk" IsChecked="{Binding ElementName=txtYesNo, Path=Text, Converter={StaticResource YesNoConverter}}" Content="Yes/No" />

        <TextBox Name="txtYesNo" />

    </StackPanel>

</Window>

C# Code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace WpfApplication2

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    ///

    public class YesNoConverter : IValueConverter

    {

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            switch (value.ToString())

            {

                case "Yes":

                    return true;

                case "No":

                    return false;

            }

            return false;

        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            if (value is bool)

            {

                if ((bool)value == true)

                    return "Yes";

                else

                    return "No";

            }

            return "No";

        }

    }

    public partial class MainWindow : Window

    {

     

        public MainWindow()

        {

            InitializeComponent();

        }

    }

}