WPF ListView 性能非常慢 - 为什么？（ElementHost，还是其他原因？）
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WPF ListView Very Slow Performance - Why? (ElementHost, or Other Reason?)
提问by Timothy Khouri
I have a Windows Forms app, that has a single ElementHost containing a WPF UserControl... in my WPF, I have a VERY simple ListView:
我有一个 Windows 窗体应用程序，它有一个包含 WPF UserControl 的 ElementHost ......在我的 WPF 中，我有一个非常简单的 ListView：
<ListView Margin="4" ItemsSource="{Binding Notifications}">
<ListView.View>
<GridView>
<GridViewColumn Header="FirstName" DisplayMemberBinding="{Binding FirstName}" />
<GridViewColumn Header="LastName" DisplayMemberBinding="{Binding LastName}" />
<GridViewColumn Header="Address" DisplayMemberBinding="{Binding Address}" />
<GridViewColumn Header="City" DisplayMemberBinding="{Binding City}" />
<GridViewColumn Header="State" DisplayMemberBinding="{Binding State}" />
<GridViewColumn Header="Zip" DisplayMemberBinding="{Binding Zip}" />
</GridView>
</ListView.View>
</ListView>
If my source has 10 items, the form loads in less than one second. If my source has 1000 items, it takes 7 seconds!!! My timer is ONLY taking the loading into account (not how much time it takes to get the items).
如果我的源有 10 个项目，表单会在不到一秒的时间内加载。如果我的源有 1000 个项目，则需要 7 秒！！！我的计时器只考虑加载（而不是获取物品所需的时间）。
So my question is:
所以我的问题是：
Is using an ElementHost a performance nightmare?
使用 ElementHost 是性能噩梦吗？
Is WPF DataBinding a performance nightmare?
WPF 数据绑定是性能噩梦吗？
Is the ListView a piece of crap? (btw, same results with the WPFToolkit's DataGrid)?
ListView 是废话吗？（顺便说一句，与 WPFToolkit 的 DataGrid 的结果相同）？
回答by
Use virtualization
使用虚拟化
<ListView ItemsSource="{BindingNames}"Name="lv">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<!--<StackPanel/>
If StackPanel was used, the memory consumed was over 2GB and dead slow.
-->
<VirtualizingStackPanel>
<!--Memory footprint is only 200 mb-->
</VirtualizingStackPanel>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
回答by Tawani
You may also want to check this excellent article on the Code Project:
您可能还想查看这篇关于代码项目的优秀文章：
WPF: Data Virtualization By Paul McClean http://www.codeproject.com/KB/WPF/WpfDataVirtualization.aspx
WPF：数据虚拟化 作者：Paul McClean http://www.codeproject.com/KB/WPF/WpfDataVirtualization.aspx
It show you a much better approach at minimal memory and bandwidth usage.
它以最少的内存和带宽使用量向您展示了一种更好的方法。
回答by Simon Voggeneder
I had a case where the answers presented here didn't solve my problem. In my case, setting the MaxHeightproperty of the ListViewto a value larger than the actual displayed height solved it immediately, thanks to this answer here, even if I cannot explain how and why it worked.
我有一个案例，这里提供的答案没有解决我的问题。就我而言，将 的MaxHeight属性设置为ListView大于实际显示高度的值立即解决了这个问题，多亏了这里的这个答案，即使我无法解释它是如何以及为什么工作的。
