WPF ListView 性能非常慢 - 为什么?(ElementHost，还是其他原因?) [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，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:

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>

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).

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).

所以我的问题是:

使用 ElementHost 是性能噩梦吗?

Is using an ElementHost a performance nightmare?

WPF 数据绑定是性能噩梦吗?

Is WPF DataBinding a performance nightmare?

ListView 是垃圾吗?(顺便说一句，与 WPFToolkit 的 DataGrid 结果相同)?

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

推荐答案

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> 

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