更改 ItemsSource 时，GridView 列宽不会更新

问题描述

我有一个 GridView，我在代码隐藏中设置了 ItemsSource.网格中的所有列均在 XAML 中定义，所有列宽均为自动".当我最初设置网格的 ItemsSource 时，列宽设置正确.

I have a GridView where I'm setting the ItemsSource in code-behind. All columns in the grid are defined in XAML, and all column widths are "Auto". When I initially set ItemsSource of the grid, the column widths are set correctly.

现在，根据用户的操作，网格的 ItemsSource 可能会设置为新的 EntityCollection.我注意到的是，列宽与之前的 ItemsSource 保持一致.也就是说，当为网格设置新的 ItemsSource 时，列宽似乎不会自动调整.代码隐藏或 XAML 中是否有任何方法可以在设置列宽时强制 Grid 使用新的 ItemsSource?我认为这是 GridView 在 ItemsSource 重置时会自动执行的操作.

Now, depending on the user's actions, the ItemsSource of the grid may be set to a new EntityCollection. What I have noticed is that the column widths remain as they were with the previous ItemsSource. That is, the column widths don't seem to adjust themselves automatically when a new ItemsSource is set for the Grid. Is there any way in code-behind or XAML to force the Grid to use the new ItemsSource when setting the column widths? I would think that this would be something that the GridView would do automatically when it's ItemsSource is reset.

<ScrollViewer VerticalScrollBarVisibility="Auto">
    <ListView>
        <ListView.View>
            <GridView>
                <GridView.Columns>
                    <GridViewColumn Width="Auto" Header="Status">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <Image Width="16" Height="16" Source="{Binding Path=Blocking}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Width="Auto" Header="Title">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextTrimming="CharacterEllipsis" Text="{Binding}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView.Columns>
            </GridView>
        </ListView.View>
    </ListView>
</ScrollViewer>

推荐答案

更新ItemsSource后使用此代码:

Use this code after updating ItemsSource:

public void AutoSizeGridViewColumns(ListView listView) 
{ 
    GridView gridView = listView.View as GridView; 
    if (gridView != null)
    { 
        foreach (var column in gridView.Columns)
        {
            if (double.IsNaN(column.Width))
                column.Width = column.ActualWidth; 
            column.Width = double.NaN; 
        } 
    } 
} 

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