Clear Validation Error On TextBox TextChanged event WPF

WPF > Validation > ClearInvalid

Removes all ValidationError objects from the specified BindingExpression object.

Example

this.TextChanged += TextBox_TextChanged;

void TextBox_TextChanged(object sender, TextChangedEventArgs e)

{

     Validation.ClearInvalid(((TextBox)sender).GetBindingExpression(TextBox.TextProperty));

}

DataGrid WPF show row number

WPF > Controls > ItemsControl > DataGrid > Show row number

XAML

<DataGrid 

        x:Name="dataGrid"

        LoadingRow="dataGrid_LoadingRow"

Code

private void dataGrid_LoadingRow(object sender, DataGridRowEventArgs e)

{

  // show row number

    e.Row.Header = (e.Row.GetIndex() + 1).ToString();

}

DataGridRow change color of selected row

WPF > DataGrid >  Color of selected row

  <DataGrid.Resources>

<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#FFB8AEAE"/>

  </DataGrid.Resources>

Last column width in WPF datagrid to take all the left space

WPF > DataGrid > Last column width


XAML

<DataGridTemplateColumn Header="Range" Width="100'*">

Or Code behind:

 // make the last column in WPF data grid take all the left space, always

dataGrid.Columns[dataGrid.Columns.Count - 1].Width = new DataGridLength(1, DataGridLengthUnitType.Star);

WPF datagrid edit cell on single click

WPF > DataGrid > Edit cell on single click

<Window.Resources>

        <Style TargetType="{x:Type DataGridCell}">

            <EventSetter Event="PreviewMouseLeftButtonDown"    Handler="DataGridCell_PreviewMouseLeftButtonDown" />

        </Style>

    </Window.Resources>

private void DataGridCell_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)

{

    DataGridCell cell = sender as DataGridCell;

    EditCell(cell, e);

}

private void EditCell(DataGridCell cell, RoutedEventArgs e)

{

    if (cell == null || cell.IsEditing || cell.IsReadOnly)

       return;

    if (!cell.IsFocused)

    {

                cell.Focus();

    }

    DGrid.BeginEdit(e);

    cell.Dispatcher.Invoke(

           DispatcherPriority.Background,

           new Action(delegate { })

    );

}

PasswordBox WPF Example

WPF > Controls  > PasswordBox 

Represents a control designed for entering and handling passwords.

Example

<Window x:Class="WpfApplication3.MainWindow"

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

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

        Title="MainWindow" Height="221" Width="372">

    <Grid Margin="0,0,101,23">

        <PasswordBox x:Name="txtPwd" HorizontalAlignment="Left" Margin="110,75,0,0" VerticalAlignment="Top" Width="120" />

        <TextBlock HorizontalAlignment="Left" Margin="55,47,0,0" TextWrapping="Wrap" Text="User" VerticalAlignment="Top"/>

        <TextBox HorizontalAlignment="Left" Height="23" Margin="110,47,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="120"/>

        <TextBlock HorizontalAlignment="Left" Margin="55,75,0,0" TextWrapping="Wrap" Text="Password" VerticalAlignment="Top" RenderTransformOrigin="0.75,2.312"/>

        <Button Content="Login" HorizontalAlignment="Left" Margin="155,116,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>

    </Grid>

</Window>

private void Button_Click(object sender, RoutedEventArgs e)

{

   if (txtPwd.Password == "pwd")

     MessageBox.Show("Login Ok");

}

Binding image in DataGrid WPF example

XAML

<Window x:Class="WpfApplication1.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>

        <DataGrid x:Name="dataGrid1" AutoGenerateColumns="False" SelectionChanged="dataGrid1_SelectionChanged">

            <DataGrid.Columns>

                <DataGridTemplateColumn>

                    <DataGridTemplateColumn.CellTemplate>

                        <DataTemplate>

                            <TextBlock Text="{Binding PictureName}" />

                        </DataTemplate>

                    </DataGridTemplateColumn.CellTemplate>

                </DataGridTemplateColumn>

                <DataGridTemplateColumn>

                    <DataGridTemplateColumn.CellTemplate>

                        <DataTemplate>

                            <Image Source="{Binding PictureFilePath}" />

                        </DataTemplate>

                    </DataGridTemplateColumn.CellTemplate>

                </DataGridTemplateColumn>

            </DataGrid.Columns>

        </DataGrid>

    </Grid>

</Window>

C#

using System;

using System.Collections.Generic;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

namespace WpfApplication1

{

    public class PictureObject

    {

        public string PictureName { get; set; }

        public Uri PictureFilePath { get; set; }

    }

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void dataGrid1_SelectionChanged(object sender, SelectionChangedEventArgs e)

        {

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            List<PictureObject> list = new List<PictureObject>();

            list.Add(new PictureObject() { PictureFilePath = new Uri("file:///c:\\Windows\\System32\\PerfCenterCpl.ico"), PictureName="Picture1" });

            dataGrid1.ItemsSource = list;

        }

    }

}