改变的ItemsSource时的GridView列的宽度不更新

问题描述

我有一个GridView在那里我设置的ItemsSource在code-后面。网格中的所有列在XAML定义，所有列宽度都自动。当我最初设置网格的ItemsSource，列宽设置正确。

现在，这取决于用户的操作，网格的的ItemsSource可被设定为一个新的EntityCollection。我注意到的是，列宽都保持着与previous的ItemsSource。也就是说，列宽似乎并不当一个新的ItemsSource设置为网格来自动调节自己。有什么办法在code-后面或XAML来强制设置列宽时使用的新的ItemsSource网格？我认为，这将是东西，在GridView会自动执行时，它的的ItemsSource复位。

 ＆LT;的ScrollViewer VerticalScrollBarVisibility =自动＆GT;
    ＆LT;＆的ListView GT;
        ＆LT; ListView.View＆GT;
            ＆LT;＆GridView的GT;
                ＆LT; GridView.Columns＆GT;
                    ＆LT; GridViewColumn WIDTH =自动标题=状态＆GT;
                        ＆LT; GridViewColumn.CellTemplate＆GT;
                            ＆LT;＆DataTemplate的GT;
                                ＆lt;图像宽度=16高度=16来源={绑定路径=阻塞}/＆GT;
                            ＆LT; / DataTemplate中＆GT;
                        ＆LT; /GridViewColumn.CellTemplate>
                    ＆LT; / GridViewColumn＆GT;
                    ＆LT; GridViewColumn WIDTH =自动标题=标题＆GT;
                        ＆LT; GridViewColumn.CellTemplate＆GT;
                            ＆LT;＆DataTemplate的GT;
                                ＆LT; TextBlock的TextTrimming =CharacterEllipsis文本={结合}/＆GT;
                            ＆LT; / DataTemplate中＆GT;
                        ＆LT; /GridViewColumn.CellTemplate>
                    ＆LT; / GridViewColumn＆GT;
                ＆LT; /GridView.Columns>
            ＆LT; / GridView的＆GT;
        ＆LT; /ListView.View>
    ＆LT; /＆的ListView GT;
＆LT; /＆的ScrollViewer GT;
 

解决方案

更​​新后，使用此code的ItemsSource：

公共无效AutoSizeGridViewColumns（ListView控件ListView控件）
{
    GridView控件的GridView = listView.View为GridView控件;
    如果（GridView控件！= NULL）
    {
        的foreach（在gridView.Columns VAR列）
        {
            如果（double.IsNaN（column.Width））
                column.Width = column.ActualWidth;
            column.Width = double.NaN;
        }
    }
}


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.

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>

解决方案

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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