WP7实现数据虚拟化

Question

我想实现数据虚拟化，但在此示例中我不知道将真正的数据收集放在何处： http : //blogs.msdn.com/b/ptorr/archive/2010/08/16/virtualizing-data-在Windows Phone 7-silverlight-applications.aspx中

Answer 1

Let us say your collection is List where Person is a Custom Class you have defined.

You should read a small subset of data from either a Service or Isolated Storage and set it as below.

In the VirtualizedDataSource.cs file update the getter of "this" property as under

 if (itemToReturn == null)
 {
      if (simpleCache.Count >= CACHE_SIZE)
      {
        DataItem oldItem = simpleCache.Dequeue();
        Debug.WriteLine("Purging\t" + oldItem.Index + "\t" + oldItem.Text);
        oldItem.Text = "DEAD ITEM";
      }

      itemToReturn = **new Person();**
      text += "\t" + itemToReturn.Text;
      simpleCache.Enqueue(itemToReturn);
 }

Hope this helps.