WPF Datagrid设置选定的行

Question

如何使用Datagrid.SelectedItem以编程方式选择行？

我首先要创建一个IEnumerable的DataGridRow对象和匹配的行传递给此SelectedItem属性或我该怎么办呢？

编辑:

TextBox.Text在选择行之前,我需要将第一列单元格的单元格内容与第一列匹配.

Answer 1

请检查以下代码是否适合您; 它遍历datagris第一列的单元格,并检查单元格内容是否等于textbox.text值并选择该行.

for (int i = 0; i < dataGrid.Items.Count; i++)
{
    DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(i);
    TextBlock cellContent = dataGrid.Columns[0].GetCellContent(row) as TextBlock;
    if (cellContent != null && cellContent.Text.Equals(textBox1.Text))
    {
        object item = dataGrid.Items[i];
        dataGrid.SelectedItem = item;
        dataGrid.ScrollIntoView(item);
        row.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
        break;
    }
}

希望这有帮助,问候

Answer 2

您无需遍历DataGrid行,您可以通过更简单的解决方案实现目标.为了匹配您的行,您可以遍历绑定到DataGrid.ItemsSource属性的集合,然后以DataGrid.SelectedItem编程方式将此项目分配给您的属性,或者,DataGrid.SelectedItems如果您希望允许用户选择多行,则可以将其添加到集合中.请参阅以下代码:

<Window x:Class="ProgGridSelection.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" Loaded="OnWindowLoaded">
<StackPanel>
    <DataGrid Name="empDataGrid" ItemsSource="{Binding}" Height="200"/>
    <TextBox Name="empNameTextBox"/>
    <Button Content="Click" Click="OnSelectionButtonClick" />
</StackPanel>

public partial class MainWindow : Window
{
    public class Employee
    {
        public string Code { get; set; }
        public string Name { get; set; }
    }

    private ObservableCollection<Employee> _empCollection;

    public MainWindow()
    {
        InitializeComponent();
    }

    private void OnWindowLoaded(object sender, RoutedEventArgs e)
    {
        // Generate test data
        _empCollection =
            new ObservableCollection<Employee>
                {
                    new Employee {Code = "E001", Name = "Mohammed A. Fadil"},
                    new Employee {Code = "E013", Name = "Ahmed Yousif"},
                    new Employee {Code = "E431", Name = "Jasmin Kamal"},
                };

        /* Set the Window.DataContext, alternatively you can set your
         * DataGrid DataContext property to the employees collection.
         * on the other hand, you you have to bind your DataGrid
         * DataContext property to the DataContext (see the XAML code)
         */
        DataContext = _empCollection;
    }

    private void OnSelectionButtonClick(object sender, RoutedEventArgs e)
    {
        /* select the employee that his name matches the
         * name on the TextBox
         */
        var emp = (from i in _empCollection
                   where i.Name == empNameTextBox.Text.Trim()
                   select i).FirstOrDefault();

        /* Now, to set the selected item on the DataGrid you just need
         * assign the matched employee to your DataGrid SeletedItem
         * property, alternatively you can add it to your DataGrid
         * SelectedItems collection if you want to allow the user
         * to select more than one row, e.g.:
         *    empDataGrid.SelectedItems.Add(emp);
         */
        if (emp != null)
            empDataGrid.SelectedItem = emp;
    }
}

Answer 3

我搜索过类似问题的解决方案,也许我的方式会帮助你和任何面对它的人.

我 SelectedValuePath="id"在XAML DataGrid定义中使用,并且我只需要做的事就是设置DataGrid.SelectedValue为所需的值.

我知道这个解决方案有利有弊,但在具体情况下快速而简单.

最好的祝福

马尔钦

Answer 4

做你想做的事情比我更喜欢做的有点棘手,但那是因为你并没有直接将a绑定DataGrid到a DataTable.

当你绑定DataGrid.ItemsSource到a时DataTable,你真的将它绑定到默认值DataView,而不是绑定到表本身.这就是为什么,例如,DataGrid当您单击列标题时,您不必执行任何操作来创建排序行 - 该功能已被烘焙DataView,并且DataGrid知道如何访问它(通过IBindingList界面).

该DataView工具IEnumerable<DataRowView>(更多或更少),并DataGrid通过遍历该填充其项目.这意味着当你绑定DataGrid.ItemsSource到a时DataTable,它的SelectedItem属性将是a DataRowView,而不是a DataRow.

如果您了解所有这些,那么构建一个包装类非常简单,它允许您公开可以绑定的属性.有三个关键属性:

• Table的DataTable,
• Row,类型的双向可绑定属性DataRowView,和
• SearchText,一个字符串属性,当它被设置时,将DataRowView在表的默认视图中找到第一个匹配项,设置Row属性并引发PropertyChanged.

它看起来像这样:

public class DataTableWrapper : INotifyPropertyChanged
{
    private DataRowView _Row;

    private string _SearchText;

    public DataTableWrapper()
    {
        // using a parameterless constructor lets you create it directly in XAML
        DataTable t = new DataTable();
        t.Columns.Add("id", typeof (int));
        t.Columns.Add("text", typeof (string));

        // let's acquire some sample data
        t.Rows.Add(new object[] { 1, "Tower"});
        t.Rows.Add(new object[] { 2, "Luxor" });
        t.Rows.Add(new object[] { 3, "American" });
        t.Rows.Add(new object[] { 4, "Festival" });
        t.Rows.Add(new object[] { 5, "Worldwide" });
        t.Rows.Add(new object[] { 6, "Continental" });
        t.Rows.Add(new object[] { 7, "Imperial" });

        Table = t;

    }

    // you should have this defined as a code snippet if you work with WPF
    private void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler h = PropertyChanged;
        if (h != null)
        {
            h(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    // SelectedItem gets bound to this two-way
    public DataRowView Row
    {
        get { return _Row; }
        set
        {
            if (_Row != value)
            {
                _Row = value;
                OnPropertyChanged("Row");
            }
        }
    }

    // the search TextBox is bound two-way to this
    public string SearchText
    {
        get { return _SearchText; }
        set
        {
            if (_SearchText != value)
            {
                _SearchText = value;
                Row = Table.DefaultView.OfType<DataRowView>()
                    .Where(x => x.Row.Field<string>("text").Contains(_SearchText))
                    .FirstOrDefault();
            }
        }
    }

    public DataTable Table { get; private set; }
}

这是使用它的XAML:

<Window x:Class="DataGridSelectionDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:dg="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit"
        xmlns:DataGridSelectionDemo="clr-namespace:DataGridSelectionDemo" 
        Title="DataGrid selection demo" 
        Height="350" 
        Width="525">
    <Window.DataContext>
        <DataGridSelectionDemo:DataTableWrapper />
    </Window.DataContext>
    <DockPanel>
        <Grid DockPanel.Dock="Top">
        <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Label>Text</Label>
            <TextBox Grid.Column="1" 
                     Text="{Binding SearchText, Mode=TwoWay}" />
        </Grid>
        <dg:DataGrid DockPanel.Dock="Top"
                     ItemsSource="{Binding Table}"
                     SelectedItem="{Binding Row, Mode=TwoWay}" />
    </DockPanel>
</Window>