如何以编程方式在 WPF DataGrid 中选择一行或一个单元格? [英] How to select a row or a cell in WPF DataGrid programmatically?

问题描述

在WinForm DataGridView中，初始化时自动选择第一行.当我试图关闭该功能时，它让我发疯了.转向 WPF DataGrid，似乎 Microsoft 已决定关闭此功能，我认为这是一件好事.但是，我现在很难启用此功能.对于某些 DataGrid，我希望在通过数据绑定填充网格后自动选择第一行.互联网上有一些建议，但我无法做到.我希望在这里好运.

In WinForm DataGridView, it automatically selects the first row when initialized. It drove me crazy when I tried to turn that feature off. Moving to WPF DataGrid, it seems Microsoft has decided to turn this feature off, which is a good thing I think. However, I have hard time to enable this feature now. For some DataGrid, I want the first row to be selected automatically after grid is populated through data binding. There are some suggestions in Internet, but I couldn't make that work. I hope for better luck here.

推荐答案

Set IsSynchronizedWithCurrentItem = "true".

为了解决您的评论，我假设您的 DataGrid 的 SelectionUnit 设置为Cell"，是吗?好的，我不确定这是否是最佳解决方案，但您可以做的一件事是处理 DataGrid 的 Loaded 事件并在代码隐藏中手动设置选定的单元格.所以你会有这样的事情:

To address your comment, I assume that your DataGrid's SelectionUnit is set to "Cell", is it? Okay, I'm not sure if this is the best solution but one thing you can do is handle the Loaded event for the DataGrid and manually set the selected cell in the code-behind. So you'll have something like this:

<DataGrid x:Name="dg" AutoGenerateColumns="False" IsSynchronizedWithCurrentItem="True"
            SelectedCellsChanged="dg_SelectedCellsChanged" SelectionUnit="Cell"
            Loaded="dg_Loaded">
    ...
</DataGrid>

事件处理程序:

private void dg_Loaded(object sender, RoutedEventArgs e)
{
    if ((dg.Items.Count > 0) &&
        (dg.Columns.Count > 0))
    {
        //Select the first column of the first item.
        dg.CurrentCell = new DataGridCellInfo(dg.Items[0], dg.Columns[0]);
        dg.SelectedCells.Add(dg.CurrentCell);
    }
}

请注意，这仅在 DataGrid.SelectionUnit 设置为Cell"时才有效.否则，我相信它会抛出异常.

Note that this will only work if the DataGrid.SelectionUnit is set to "Cell". Otherwise, I believe it will throw an exception.

XAML:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <Button Click="Button_Click">Reset</Button>
        <DataGrid x:Name="dg" AutoGenerateColumns="False" IsSynchronizedWithCurrentItem="True"
                SelectionUnit="Cell"
                DataContextChanged="dg_DataContextChanged"
                ItemsSource="{Binding Items}"
                Loaded="dg_Loaded">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding}"/>
            </DataGrid.Columns>
        </DataGrid>
    </StackPanel>
</Window>

代码隐藏:

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.LoadItems();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.LoadItems();
        }

        private void LoadItems()
        {
            this.DataContext = new { Items = new List<string> { "Item1", "Item2", "Item3" } };
            this.SelectFirstItem();
        }

        private void dg_Loaded(object sender, RoutedEventArgs e)
        {
            SelectFirstItem();
        }

        void SelectFirstItem()
        {
            if ((dg.Items.Count > 0) &&
                (dg.Columns.Count > 0))
            {
                //Select the first column of the first item.
                dg.CurrentCell = new DataGridCellInfo(dg.Items[0], dg.Columns[0]);
                dg.SelectedCells.Add(dg.CurrentCell);
            }
        }

        private void dg_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            this.SelectFirstItem();
        }
    }
}

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