缓慢的ScrollViewer性能比较与数据网格 [英] ScrollViewer slow perfomance with DataGrid

问题描述

我有以下情形：

<ScrollViewer>
    <Grid>
         <!--many other controls-->
         <DataGrid />
    </Grid>
</ScrollViewer>

现在，当我绑定的DataGrid到大量的数据（约10.000行），我有很慢的性能比较的。事实上，我得到了OutOfMemory异常（我有8 GB的内存）！我读的地方，这是因为覆盖ScrollViewer的DataGrid的虚拟化（或类似的东西），但我不知道该怎么prevent的。如果我删除的ScrollViewer，问题解决了！数据加载在不到一秒的时间。

Now, when I bind DataGrid to large amount of data (around 10.000 rows) I am having very slow perfomance. In fact, i get OutOfmemory exception (and I have 8 GB memory)! I read somewhere that this is because ScrollViewer overrides DataGrid virtualisation (or something like that), but I don't know how to prevent that. If I remove the ScrollViewer, problem solved! The data loads in less than a second.

我想保留的ScrollViewer（因为其他控件），并有不错的表现。那可能吗？如果没有，是否有任何其他的解决办法，解决方法吗？

I want to keep the ScrollViewer (because of other controls) and have good performance. Is that possible? If not, is there any other solution-workaround?

推荐答案

一个共同的解决办法，以这些类型的问题，是在同一行中添加一个不可见的大小元素为的DataGrid ，那么你可以绑定 DataGrid.Height 到的ActualHeight 上浆元素。这样一来，你的的DataGrid 总会消耗 RowDefinition 的高度。示例

A common workaround to these sorts of problems is to add an invisible "sizing element" in the same Row as the DataGrid, then you can bind DataGrid.Height to the ActualHeight of the sizing element. This way, your DataGrid will always consume the Height of the RowDefinition. Example

<ScrollViewer>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Button Content="Some Control.." />
        <Rectangle Name="sizingElement"
                   Grid.Row="1"
                   Fill="Transparent"
                   Margin="1"/>
        <DataGrid Grid.Row="1"
                  Height="{Binding ElementName=sizingElement,
                                   Path=ActualHeight, FallbackValue=1}">
            <!--...-->
        </DataGrid>
        <Button Content="Some more controls etc.." Grid.Row="2"/>
    </Grid>
</ScrollViewer>

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