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POWPF Data Virtualization in MVVM pattern
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  1. POWPF Data Virtualization in MVVM pattern
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    copied!<p>, i want to know how can i implement data virtualzation in mvvm pattern ? i have searched but i didnt find data virtualzation using mvvm pattern.</p> <p>this link descripes data virtualzation very good but not in mvvm.</p> <p><a href="http://www.codeproject.com/Articles/34405/WPF-Data-Virtualization" rel="nofollow">http://www.codeproject.com/Articles/34405/WPF-Data-Virtualization</a></p> <p>so please provide a link or example..</p> <pre><code>using System; using System.Collections.Generic; using System.Windows; using System.Windows.Threading; namespace DataVirtualization { /// &lt;summary&gt; /// Interaction logic for DemoWindow.xaml /// &lt;/summary&gt; public partial class DemoWindow { /// &lt;summary&gt; /// Initializes a new instance of the &lt;see cref="DemoWindow"/&gt; class. /// &lt;/summary&gt; public DemoWindow() { InitializeComponent(); // use a timer to periodically update the memory usage DispatcherTimer timer = new DispatcherTimer(); timer.Interval = new TimeSpan(0, 0, 1); timer.Tick += timer_Tick; timer.Start(); } private void timer_Tick(object sender, EventArgs e) { tbMemory.Text = string.Format("{0:0.00} MB", GC.GetTotalMemory(true)/1024.0/1024.0); } private void Button_Click(object sender, RoutedEventArgs e) { // create the demo items provider according to specified parameters int numItems = int.Parse(tbNumItems.Text); int fetchDelay = int.Parse(tbFetchDelay.Text); DemoCustomerProvider customerProvider = new DemoCustomerProvider(numItems, fetchDelay); // create the collection according to specified parameters int pageSize = int.Parse(tbPageSize.Text); int pageTimeout = int.Parse(tbPageTimeout.Text); if ( rbNormal.IsChecked.Value ) { DataContext = new List&lt;Customer&gt;(customerProvider.FetchRange(0, customerProvider.FetchCount())); } else if ( rbVirtualizing.IsChecked.Value ) { DataContext = new VirtualizingCollection&lt;Customer&gt;(customerProvider, pageSize); } else if ( rbAsync.IsChecked.Value ) { DataContext = new AsyncVirtualizingCollection&lt;Customer&gt;(customerProvider, pageSize, pageTimeout*1000); } } } </code></pre> <p>}</p> <p>Thanks</p>
 

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