WPF DependencyProperty Register Default Value

WPF > DependencyProperty > Register > Default Value

public static readonly DependencyProperty

UpdateSourceTriggerProperty = DependencyProperty.Register("UpdateSourceTrigger", typeof(UpdateSourceTrigger),

typeof(TextBox),

new FrameworkPropertyMetadata(UpdateSourceTrigger.LostFocus)); // add your default value here

WPF Validation remove red border on error

WPF  > Validation > Remove red border on error

Validation.ErrorTemplate="{x:Null}

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 { })

    );

}