WPF ListView非常慢的性能 - 为什么？ （ElementHost或其他原因？） [英] WPF ListView Very Slow Performance - Why? (ElementHost, or Other Reason?)

问题描述

我有一个Windows窗体应用程序，在我的WPF中有一个包含WPF UserControl的单个ElementHost，我有一个非常简单的ListView：

 < ListView Margin =4ItemsSource ={Binding Notifications}> 
< ListView.View> 
< GridView> 
< GridViewColumn Header =FirstNameDisplayMemberBinding ={Binding FirstName}/> 
< GridViewColumn Header =LastNameDisplayMemberBinding ={Binding LastName}/> 
< GridViewColumn Header =AddressDisplayMemberBinding ={Binding Address}/> 
< GridViewColumn Header =CityDisplayMemberBinding ={Binding City}/> 
< GridViewColumn Header =StateDisplayMemberBinding ={Binding State}/> 
< GridViewColumn Header =ZipDisplayMemberBinding ={Binding Zip}/> 
< / GridView> 
< /ListView.View> 
< / ListView> 
  

如果我的源有10个项目，则表单加载不到一秒钟。如果我的来源有1000个项目，需要7秒！我的计时器只考虑加载（不需要多少时间获取项目）。

所以我的问题是：

是否使用ElementHost表演噩梦？

WPF DataBinding是否表现噩梦？

ListView是一个垃圾？ （btw，与WPFToolkit的DataGrid相同的结果）？

解决方案

使用虚拟化

 < ListView ItemsSource ={BindingNames}Name =lv> 
< ListView.ItemsPanel> 
< ItemsPanelTemplate> 
<！ - < StackPanel /> 
如果使用StackPanel，则消耗的内存超过2GB，死缓。 
  - > 
< VirtualizingStackPanel> 
<！ - 内存占用只有200 mb  - > 
< / VirtualizingStackPanel> 
< / ItemsPanelTemplate> 
< /ListView.ItemsPanel> 
< ListView.ItemTemplate> 
< DataTemplate> 
< TextBlock Text ={Binding}/> 
< / DataTemplate> 
< /ListView.ItemTemplate> 
< / ListView> 
  

I have a Windows Forms app, that has a single ElementHost containing a WPF UserControl... in my WPF, I have a VERY simple 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).

So my question is:

Is using an ElementHost a performance nightmare?

Is WPF DataBinding a performance nightmare?

Is the ListView a piece of crap? (btw, same results with the WPFToolkit's DataGrid)?

解决方案

Use virtualization

<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> 

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