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();

        }

    }

}

Binding path to current source WPF

WPF > Binding > Path

What is Binding Path=. ?

Answer:

A period (.) path can be used to bind to the current source.

Expander Control WPF Example

WPF > Controls > Layout > Expander

Expander displays a header that has a collapsible window that displays content when user clicks arrow button.

• Expander in ListBox

Example

XAML

<Window x:Class="ImageManager.MainWindow"

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

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

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

    <Grid>

        <Expander Header="Expander1" HorizontalAlignment="Left" Margin="59,94,0,0" VerticalAlignment="Top">

           <TextBlock Text="Expander 1" />

        </Expander>

        <Expander Header="Expander2" HorizontalAlignment="Left" Margin="59,141,0,0" VerticalAlignment="Top">

            <TextBlock Text="Expander 2" />

        </Expander>

    </Grid>

</Window>

ListBox Expander Binding WPF Example

WPF > Controls > Layout > Expander > In ListBox

ListBox Expander Binding WPF Example

XAML

<Window x:Class="ImageManager.MainWindow"

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

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

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

    <Grid>

        <ListBox Name="lst" Margin="5" ItemsSource="{Binding}" HorizontalContentAlignment="Stretch">

            <ListBox.ItemTemplate>

                <DataTemplate>

                    <StackPanel>

                        <TextBlock Margin="5" FontSize="16" FontWeight="Bold" Text="{Binding Path=Name}"/>

                        <Expander Name="expender">

                            <Border Margin="5" Background="Wheat" BorderThickness="2" BorderBrush="#FF7A3E3E">

                                <StackPanel>

                                    <TextBlock Margin="5, 0"  Foreground="Blue" Text="{Binding Path=FreeSpace}"/>

                                    <TextBlock Margin="5, 0"  Foreground="Blue" Text="{Binding Path=Type}"/>

                                </StackPanel>

                            </Border>

                        </Expander>

                    </StackPanel>

                </DataTemplate>

            </ListBox.ItemTemplate>

        </ListBox>

    </Grid>

</Window>

C# Code

using System;

using System.Collections.Generic;

using System.IO;

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 ImageManager

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

   

    public class FileInfo

    {

        public FileInfo(string driveName, string freeSpace, string type)

         {

             Name = driveName;

             FreeSpace = "Free space: " +  freeSpace;

             Type = "Type: " + type;

         }

        public string Name

        { get; set; }

        public string FreeSpace

         { get; set; }

        public string Type

        { get; set; }

     

     }

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            List<FileInfo> states = new List<FileInfo>();

            DriveInfo[] ListDrives = DriveInfo.GetDrives();

            foreach (DriveInfo Drive in ListDrives)

            {

              if(Drive.IsReady )

                    states.Add(new FileInfo(Drive.Name, Drive.AvailableFreeSpace.ToString(), Drive.DriveType.ToString()) );

                  

            }

            lst.ItemsSource = states;

        }

        void FileDirSearch(string sDir, List<string> sfiles, string pattern)

        {

            try

            {

                foreach (string d in Directory.GetDirectories(sDir))

                {

                    foreach (string f in Directory.GetFiles(d, pattern))

                    {

                        sfiles.Add(f);

                    }

                    FileDirSearch(d, sfiles, pattern);

                }

            }

            catch (Exception exc)

            {

                MessageBox.Show(exc.Message);

            }

        }

    }

}

Open File Dialog WPF Example

WPF > Windows > OpenFileDialog


Open File Dialog  WPF Example

Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();

dlg.FileName = "Document";
dlg.DefaultExt = ".doc";
Nullable<bool> result = dlg.ShowDialog();
if (result == true)
{
   string filename = dlg.FileName;
}