Set current date WPF calendar

WPF -> Calendar

calendar.DisplayDate = new DateTime(2020, 4, 17);
calendar.SelectedDate = new DateTime(2020, 4, 17);

WPF Calendar SelectedDates

WPF->Calendar

Add multiple selected dates to WPF Calendar.

<Grid>

   <Calendar x:Name="calendar" />

</Grid>

calendar.SelectionMode = CalendarSelectionMode.MultipleRange; 
calendar.SelectedDates.Add(new DateTime(2020, 1, 1)); 
calendar.SelectedDates.Add(new DateTime(2020, 1, 2));

WPF TabControl Example

WPF -> Controls -> TabControl 

WPF TabControl elements display content on discrete pages accessed by selecting the appropriate tab.

Example

<Window x:Class="Agenda.MainWindow"

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

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

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d"

        Title="MainWindow" Height="450" Width="800">

    <Grid>

        <TabControl>

            <TabItem Header="Agenda">

            </TabItem>

            <TabItem Header="Cards">

            </TabItem>

        </TabControl>

    </Grid>

</Window>

DatePicker WPF Example

System.Windows.Controls -> DatePicker

Represents a control that allows the user to select a date.

Example

<Window x:Class="WpfApp4.MainWindow"

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

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

    <Grid>

        <DatePicker HorizontalAlignment="Left" Margin="225,118,0,0" VerticalAlignment="Top" SelectedDateChanged="DatePicker_SelectedDateChanged"/>

    </Grid>

</Window>

private void DatePicker_SelectedDateChanged(object sender, SelectionChangedEventArgs e)

{

  var datePicker = sender as DatePicker;

  MessageBox.Show(datePicker.SelectedDate.ToString());

}

Display XAML window in the second display WPF

WPF > Windows > Forms > Screen

AllScreens gets an array of all displays on the system.

Example

Display window in the second display WPF

private void Window_Loaded(object sender, RoutedEventArgs e)

{

   var screen = System.Windows.Forms.Screen.AllScreens.Where(s => !s.Primary).First();

   var area = screen.WorkingArea;

   Left = area.Left;

   Top = area.Top;

   Width = area.Width;

   Height = area.Height;

}

GridViewColumnHeader WPF Example

WPF > Controls  > ContentControl > GridViewColumnHeader

GridViewColumnHeader object is a button control that is derived from ButtonBase. 

Column headers in a GridView view mode are GridViewColumnHeader objects.

Example

<Window x:Class="GridViewColumnHeader.MainWindow"

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

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

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        xmlns:local="clr-namespace:GridViewColumnHeader"

        mc:Ignorable="d"

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

    <Grid>

        <ListView>

            <ListView.View>

                <GridView>

                    <GridViewColumn>

                        <GridViewColumnHeader>Name

                            <GridViewColumnHeader.ContextMenu>

                                <ContextMenu>

                                    <MenuItem Header="Ascending" />

                                    <MenuItem Header="Descending" />

                                </ContextMenu>

                            </GridViewColumnHeader.ContextMenu>

                        </GridViewColumnHeader>

                    </GridViewColumn>

                </GridView>

            </ListView.View>

        </ListView>

    </Grid>

</Window>

Get Vertical ScrollBar Width WPF

WPF > Windows > SystemParameters > VerticalScrollBarWidth


This value indicates the width (in pixels) of a vertical scroll bar.

SystemParameters.VerticalScrollBarWidth

WPF SystemParameters Class

WPF > Windows > SystemParameters

• VerticalScrollBarWidth

Bind Width to another Width control WPF

WPF > Binding > Width

<Grid>

  <Grid.ColumnDefinitions>

    <ColumnDefinition 

Width="{Binding ElementName=controlName, Path=ActualWidth}"/>

  </Grid.ColumnDefinitions>

ScrollToTop DataGrid WPF

WPF> DataGrid > Scroll To Top

var border = VisualTreeHelper.GetChild(myDataGrid, 0) as Decorator;

if (border != null && border.Child !=null)

{

  var scrollViewer = border.Child as ScrollViewer;

  if (scrollViewer != null)

  {

    scrollViewer.ScrollToTop();

  }

}

FrameworkElementFactory focus on load element

WPF > FrameworkElementFactory > AddHandler

FrameworkElementFactory textBox = new FrameworkElementFactory(typeof(TextBox));

textBox.AddHandler(TextBox.LoadedEvent, new RoutedEventHandler(OnTextBoxLoaded));

private void OnTextBoxLoaded(object sender, RoutedEventArgs e)

{

       TextBox textBox = sender as TextBox;

       if (textBox != null)

       {

              textBox.Focus();

       }

}

Disable row selection datagrid WPF

How to disable row selection in datagrid WPF?

Answer:

myDataGrid.IsHitTestVisible = false;

Find TextBox control ComboBox WPF

WPF > Controls > ItemsControl > ComboBox

Use FindName to find an element that has the provided identifier name.

PART_EditableTextBox

TextBox

Contains the text of the ComboBox

Example

var textBox = comboBox.Template.FindName("PART_EditableTextBox", comboBox) as TextBox;

Set DataGrid DataGridRow Background color WPF

WPF > DataGrid > DataGridRow > Background


<DataGrid.RowStyle>

  <Style TargetType="DataGridRow">

    <Style.Triggers>

      <DataTrigger Binding="{Binding IsValid}" Value="true">

        <Setter Property="Background" Value="Green"></Setter>

      </DataTrigger>

      <DataTrigger Binding="{Binding IsValid}" Value="false">

        <Setter Property="Background" Value="Red"></Setter>

      </DataTrigger>

    </Style.Triggers>

  </Style>

</DataGrid.RowStyle>

Clear Sort WPF DataGrid

WPF > Controls > ItemsControl > DataGrid > Clear Sort

_collectionView = (CollectionView)CollectionViewSource.GetDefaultView(dataGrid.Items);

_collectionView.SortDescriptions.Clear();

Convert Hex to SolidColorBrush

WPF > System.Windows.Media > BrushConverter

BrushConverter is used to convert a Brush object to or from another object type.

Example:

row.Background = (SolidColorBrush)(new BrushConverter().ConvertFrom("#FFA7CDF0"));

Get Current Row WPF DataGrid

WPF > Controls > ItemsControl > DataGrid > ItemContainerGenerator > ContainerFromIndex

Returns the element corresponding to the item at the given index.

Example

How to get current row if row is not selected.

var index = dataGrid.Items.IndexOf(dataGrid.CurrentItem);

var row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);

Get rectangles from canvas WPF code behind

WPF > Controls > Layout > Canvas > Children


Example 

Get all rectangles from canvas.

private List<Rectangle> GetRectangles()

{

    return canvas.Children.OfType<Rectangle>().ToList();

}

Round line WPF code behind

WPF > Line 

Line line = new Line

{
 Stroke = Brushes.Blue,

 StrokeThickness = 18,

 StrokeStartLineCap = PenLineCap.Round,

 StrokeEndLineCap = PenLineCap.Round,

 Height= 50,

 X1 = 50,

 X2 = 100,

 Y1 = 10,

 Y2 = 10

};

canvas.Children.Add(line);

        

Slider WPF Example

WPF > Controls > Slider 

    <Grid>

        <TextBox

            Text="{Binding ElementName=Slider, Path=Value,             UpdateSourceTrigger=PropertyChanged}"

            Margin="33,112,288,172"/>

        <Slider

            Maximum="100"  

            Name="Slider"

            Margin="33,48,288,213"

            IsSnapToTickEnabled="True"

            TickFrequency="1" />

    </Grid>