从datarowview WPF获取datagridrow

Question

我试图循环数据网格中的每一行,拉出一个列值,将此值传递给一个方法,并根据方法的结果设置该行的样式.

在发现我无法循环遍历数据网格的行之后,我发现这篇文章详细说明了它的可行性.

我稍微修改了一下,以便我使用datarowview对象.

我现在面临的问题是

var dgRow = grid.ItemContainerGenerator.ContainerFromItem(r) as DataGridRow;

总是返回null.

请有人可以告诉我为什么会发生这种情况,如果他们能看到更容易的方法.

如果您需要更多信息,请告诉我.

继承我的代码:

private void colorArchived( DataGrid grid , GX3MaterialSelectionData data)
    {
        var row = GetDataGridRows(grid);
        foreach (DataRowView r in row)
        {
            var dgRow = grid.ItemContainerGenerator.ContainerFromItem(r) as DataGridRow;
            int val = int.Parse(r.Row[0].ToString());
            if ( data.IsArchived(val) )
            {
                // style will be defined in xaml
                dgRow.Style = mystyle;
            }


        }

    }

    public IEnumerable<DataRowView> GetDataGridRows(DataGrid grid)
    {
        var itemsSource = grid.ItemsSource as IEnumerable;
        if (null == itemsSource) yield return null;
        foreach (var item in itemsSource)
        {
            var row = item;
            if (null != row) yield return (DataRowView)row;
        }
    }

Answer 1

在这种情况下，您可以使用 StyleSelector。

public class RowStyle : StyleSelector
{
    public override Style SelectStyle(object item, DependencyObject container)
    {
        // here the item property is the entity that the grid row is bound to.
        // check whatever values you want on it and locate a matching style with
        // find resource.

        // return a reference to the correct style here

        // or allow this to run if you want the default style.
        return base.SelectStyle(item, container);
    }
}

要在数据网格上使用它，您需要设置 RowStyleSelector 属性。

<Window x:Class="Rich.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:Rich"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:RowStyle x:Key="styleSelector"/>
    </Window.Resources>
    <Grid>
        <DataGrid ItemsSource="{Binding Items}" RowStyleSelector="{StaticResource styleSelector}">            
            <DataGrid.Columns>
                <DataGridTextColumn Header="test" Binding="{Binding Test1}"/>
                <DataGridTextColumn Header="test2" Binding="{Binding Test2}"/>
                <DataGridTextColumn Header="test3" Binding="{Binding Test3}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>