ProgressBar: Value and Maximum
This page was last reviewed on Sep 28, 2022.
Dot Net Perls
ProgressBar, WPF. A ProgressBar graphically displays progress. As it is updated, by setting its Value property, it displays a colored bar.
To begin, please create a WPF project and drag a ProgressBar to your Window. Now, adjust some of the attributes on the ProgressBar in the XAML.
Attribute example. We set its Foreground, and use its Value and Maximum properties. Change the Foreground—we use a fish color ("Salmon") here.
Detail I added the Name attribute to the ProgressBar. I chose the short (but not descriptive) Name of "B".
Next I added a separate Button control by dragging it to the Window. I specified the "Click" attribute.
Finally In Button_Click, I increase the Value property of the ProgressBar by one-fifth of its Maximum.
<Window x:Class="WpfApplication27.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"> <Grid> <ProgressBar HorizontalAlignment="Left" Height="10" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" Name="B" Foreground="Salmon"/> <Button Content="Add" HorizontalAlignment="Left" Margin="115,10,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/> </Grid> </Window>
using System.Windows; using System.Windows.Controls; namespace WpfApplication27 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { // ... Add 1/5 to the ProgressBar. B.Value += (B.Maximum / 5); // ... See if ProgressBar has reached its max. if (B.Value == B.Maximum) { // ... Change button Content. Button button = sender as Button; button.Content = "DONE"; } } } }
Program result. If you click on the Button 5 times, the ProgressBar is at 100%. When the Value equals the maximum of the ProgressBar, the Button is changed to display "DONE".
ValueChanged. One useful event handler on the ProgressBar is ValueChanged. It functions in a similar way to ValueChanged on the Slider control.
In many programs, a ProgressBar is meant to update as a program completes a long-running task. Occasionally, a ProgressBar is used to indicate progress in a sign-up form.
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Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Sep 28, 2022 (edit).
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