本文整理汇总了VB.NET中System.Windows.Forms.ListView.RetrieveVirtualItem事件的典型用法代码示例。如果您正苦于以下问题：VB.NET ListView.RetrieveVirtualItem事件的具体用法？VB.NET ListView.RetrieveVirtualItem怎么用？VB.NET ListView.RetrieveVirtualItem使用的例子？那么, 这里精选的事件代码示例或许可以为您提供帮助。您也可以进一步了解该事件所在类System.Windows.Forms.ListView的用法示例。
在下文中一共展示了ListView.RetrieveVirtualItem事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Not
'The basic VirtualMode function. Dynamically returns a ListViewItem
'with the required properties; in this case, the square of the index.
Private Sub listView1_RetrieveVirtualItem(ByVal sender As Object, ByVal e As RetrieveVirtualItemEventArgs) Handles listView1.RetrieveVirtualItem
'Caching is not required but improves performance on large sets.
'To leave out caching, don't connect the CacheVirtualItems event
'and make sure myCache is null.
'check to see if the requested item is currently in the cache
If Not (myCache Is Nothing) AndAlso e.ItemIndex >= firstItem AndAlso e.ItemIndex < firstItem + myCache.Length Then
'A cache hit, so get the ListViewItem from the cache instead of making a new one.
e.Item = myCache((e.ItemIndex - firstItem))
Else
'A cache miss, so create a new ListViewItem and pass it back.
Dim x As Integer = e.ItemIndex * e.ItemIndex
e.Item = New ListViewItem(x.ToString())
End If
End Sub