How to reset WPF progress bar?

Question

Hello guys

I'm testing a WPF progress bar and trying to reset it to its initial state, but it doesn't work.

Duration duration = new Duration(TimeSpan.FromSeconds(1));
DoubleAnimation doubleanimation = new DoubleAnimation(200.0, duration);
myProgress.IsIndeterminate = true;
myProgress.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);
myProgress.Value = 0;

Before animation, the progress bar is static (no animation). After animation, the progress bar color is now light gray (lighter than before) with a brightening flash effect.

When commenting duration and double animation, the progress bar remains static. I see there's something to do with this double animation.

//Duration duration = new Duration(TimeSpan.FromSeconds(1));
//DoubleAnimation doubleanimation = new DoubleAnimation(200.0, duration);
myProgress.IsIndeterminate = true;
//myProgress.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);
myProgress.Value = 10;
myProgress.Value = 0;

How can I solve this DoubleAnimation issue? What am I missing here?

Answer 1

Have a look at this thread:

http://stackoverflow.com/questions/20298/how-to-stop-an-animation-in-c-wpf

Answer 2

Use this form of the DoubleAnimation instead

DoubleAnimation doubleanimation = new DoubleAnimation(0,200, duration);

Where you explicitly set both a from and too value rather than just a destination value.

Code:

Within the window ctor:

myProgress.Maximum = 100; myProgress.Minimum = 0;

Then say in a button click handler

myProgress.IsIndeterminate = false; //shouldn't really need this PB oddity
myProgress.IsIndeterminate = true;
myProgress.Value = 0;

Duration duration = new Duration(TimeSpan.FromSeconds(1));
DoubleAnimation doubleanimation = new DoubleAnimation(0,200, duration);

myProgress.BeginAnimation(ProgressBar.ValueProperty, doubleanimation);

The PB is in a StackPanel, xaml is

<ProgressBar Name="myProgress" Height="20"></ProgressBar>

This was initially tested on XP but see below

For a Win 7 solution please see here

link text