Here is a small control template to display an error message. The message will fade away after a couple of seconds. You set the message like this:-
Label1.Content = DateTime.Now.ToString();
Here is the xaml:-
<Window x:Class="TRM_Uploader.Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window2" Height="300" Width="300">
<Window.Resources>
<ControlTemplate x:Key="MyErrorMessage"
TargetType="{x:Type Label}">
<StackPanel Orientation="Horizontal"
Name="ErrorMessage">
<Border CornerRadius="4"
BorderThickness="0"
Background="Red"
VerticalAlignment="Center"
Margin="4,0"
BorderBrush="Transparent">
<Label Foreground="White"
VerticalAlignment="Center"
Padding="4,2"
FontWeight="Bold"
Name="Part1"
Visibility="Visible">Error</Label>
</Border>
<!-- This TextBlock accepts the content from the parent 'label'. It is not actually displayed, just used to bind data-->
<TextBlock Name="Part3"
Text="{TemplateBinding Content}"
Visibility="Collapsed"></TextBlock>
<!-- This TextBlock binds to the one above and triggers an animation when it gets updated. -->
<!-- Its required because TemplateBinding does not allow NotifyOnTargetUpdate -->
<TextBlock Margin="2"
Name="Part2"
Foreground="Red"
Padding="3"
Text="{Binding ElementName=Part3, Path=Text,NotifyOnTargetUpdated=True}"
VerticalAlignment="Center"></TextBlock>
</StackPanel>
<ControlTemplate.Triggers>
<!-- When Text property of Part2 is blank hide entire control-->
<Trigger SourceName="Part3"
Property="Text"
Value="">
<Setter TargetName="ErrorMessage"
Property="Visibility"
Value="Hidden"></Setter>
</Trigger>
<!-- This trigger is called when Part2 updates which in turn is updated by Part3's databind.
It uses animation to make the label fade away after a few seconds. -->
<EventTrigger SourceName="Part2"
RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard>
<Storyboard TargetName="ErrorMessage">
<DoubleAnimation Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1.0" />
<DoubleAnimation Storyboard.TargetProperty="Opacity"
Duration="0:0:2"
From="1.0"
To="0.0"
BeginTime="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
<StackPanel Orientation="Vertical">
<Label Template="{StaticResource MyErrorMessage}"
Name="Label1"></Label>
<Button Click="button1_Click">click to test</Button>
</StackPanel>
</Window>
And the c#
public partial class Window2 : Window
{
public Window2 ()
{
InitializeComponent();
}
private void button1_Click (object sender, RoutedEventArgs e)
{
Label1.Content = DateTime.Now.ToString();
}
}
