WPF

Pew_new wrote:

The major question is what do we really have valuable when we do a substraction as follows: ScanTime = DateTime.Now - _lastScanTime?

Richard MacCutchan wrote:

This will occur after approximately 250 milliseconds as declared by the timer intialisation values.

Pew_new wrote:

What I'm doing wrong with a label?

DispatcherTimer Class (System.Windows.Threading) | Microsoft Docs[^]:

If a System.Timers.Timer is used in a WPF application, it is worth noting that the System.Timers.Timer runs on a different thread than the user interface (UI) thread. In order to access objects on the user interface (UI) thread, it is necessary to post the operation onto the Dispatcher of the user interface (UI) thread using Invoke or BeginInvoke.

Reasons for using a DispatcherTimer as opposed to a System.Timers.Timer are that the DispatcherTimer runs on the same thread as the Dispatcher and a DispatcherPriority can be set on the DispatcherTimer.

<Application x:Class="WPF_WindowStyle.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WPF_WindowStyle"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style x:Key="CustomWindow" TargetType="{x:Type Window}">
            <Setter Property="WindowStyle" Value="None"/>
            <Setter Property="AllowsTransparency" Value="True"/>
            <Setter Property="MinWidth" Value="100"/>
            <Setter Property="MinHeight" Value="46"/>
            <!--CaptionHeight + ResizeBorderThickness * 2-->
            <Setter Property="Background" Value="Yellow"/>
            <Setter Property="BorderBrush" Value="Green"/>
            <Setter Property="BorderThickness" Value="5"/>
            <Setter Property="Foreground" Value="DarkRed"/>
            <Setter Property="Template" Value="{StaticResource WindowTemplate}"/>
        </Style>

    </Application.Resources>
</Application>

<Window x:Class="WPF_WindowStyle.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:WPF_WindowStyle"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525" Style="{StaticResource RedWindow}">
    <Grid>
        
    </Grid>
</Window>

Pew_new wrote:

<Style x:Key="CustomWindow"

Pew_new wrote:

Style="{StaticResource RedWindow}"

Style="{StaticResource CustomWindow}"