Progress Bar while fetching data from server in WP7

Question

在wp7中从数据库中获取数据时如何显示进度条？

Answer 1

When you are fetching data, set a flag ( bool ) IsLoading to true . When it's done, set the same flag to false . Implement the onPropertyChanged -event whenever this is changed.

To show a progress bar, add the following to your XAML :

<toolkit:PerformanceProgressBar 
       x:Name="performanceProgressBar" 
         IsIndeterminate="true" 
         Visibility="{Binding IsLoading, Converter={StaticResource VisibilityConverter}}" />

Then you implement a VisibilityConverter and to make your bool value into a Visibility -enum.

There's tons of information about this on the web, so I'm not going to rewrite what others taught me. Have a look at these links:

• http://bit.ly/S1SjTf <-- start here
• http://www.windowsphonegeek.com/articles/WP7-PerformanceProgressBar-in-depth
• http://blogs.msdn.com/b/rickyt/archive/2010/08/18/windows-phone-applications-downloading-images-and-indeterminate-progressbar.aspx