WPF Datagrid设置选定的行

时间:2009-12-29 18:24:30

标签: wpf select datagrid selecteditem

如何使用Datagrid.SelectedItem以编程方式选择行?

我是否首先必须创建IEnumerableDataGridRow个对象并将匹配的行传递给此SelectedItem属性,或者我该如何处理?

修改

在选择行之前,我需要首先将第一列单元格的单元格内容与TextBox.Text匹配。

8 个答案:

答案 0 :(得分:36)

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,尊重

答案 1 :(得分:21)

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,然后以编程方式将此项目分配给DataGrid.SelectedItem属性,或者您可以将其添加到DataGrid.SelectedItems集合中如果要允许用户选择多行。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;
    }
}

答案 2 :(得分:8)

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。

我在XAML DataGrid定义中使用了SelectedValuePath="id",并且我只需要将DataGrid.SelectedValue设置为所需的值。

我知道这个解决方案有利有弊,但在具体情况下是快速而简单的。

祝你好运

的Marcin

答案 3 :(得分:7)

做你想做的事比我想要的要复杂一点,但那是因为你并没有真正直接将DataGrid绑定到DataTable

DataGrid.ItemsSource绑定到DataTable时,您确实将其绑定到默认DataView,而不是绑定到表本身。这就是为什么,例如,当您单击列标题时,您不必执行任何操作来创建DataGrid排序行 - 该功能已烘焙到DataViewDataGrid知道如何访问它(通过IBindingList接口)。

DataView实现IEnumerable<DataRowView>(或多或少),DataGrid通过迭代来填充其项目。这意味着当您将DataGrid.ItemsSource绑定到DataTable时,其SelectedItem属性将为DataRowView,而不是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:

  • TableDataTable
  • Row,类型为DataRowView的双向可绑定属性,
  • SearchText,一个字符串属性,当它被设置时,将在表的默认视图中找到第一个匹配的DataRowView,设置Row属性,并引发PropertyChanged

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>

答案 4 :(得分:2)

//一般来说,访问所有行//

foreach (var item in dataGrid1.Items)
{
    string str = ((DataRowView)dataGrid1.Items[1]).Row["ColumnName"].ToString();
}

//访问选定的行//

private void dataGrid1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    try
    {
        string str = ((DataRowView)dataGrid1.SelectedItem).Row["ColumnName"].ToString();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

答案 5 :(得分:1)

我已经更改了serge_gubenko的代码并且效果更好

for (int i = 0; i < dataGrid.Items.Count; i++)
{
    string txt = searchTxt.Text;
    dataGrid.ScrollIntoView(dataGrid.Items[i]);
    DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(i);
    TextBlock cellContent = dataGrid.Columns[1].GetCellContent(row) as TextBlock;
    if (cellContent != null && cellContent.Text.ToLower().Equals(txt.ToLower()))
    {
        object item = dataGrid.Items[i];
        dataGrid.SelectedItem = item;
        dataGrid.ScrollIntoView(item);
        row.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
        break;
    }
}

答案 6 :(得分:0)

我最近遇到过这个问题(与问题的年龄相比)TechNet文章,其中包含了我可以在该主题上找到的一些最佳技术:

WPF: Programmatically Selecting and Focusing a Row or Cell in a DataGrid

它包含应涵盖大多数要求的详细信息。重要的是要记住,如果为某些行指定DataGridRow的自定义模板,这些行不会包含DataGridCells,那么网格的正常选择机制将不起作用。

正如其他人所说的那样,您需要更具体地说明您给出网格的数据源以回答问题的第一部分。

答案 7 :(得分:0)

如果有任何人在这里遇到问题,在OnSelectionChanged之后发生内部网格选择问题 - 在尝试所有选择设置器十几个小时失败之后,唯一有用的是重新加载和重新填充DataGrid以及所选项目。根本不优雅,但此时我不确定在我的情况下是否存在更好的解决方案。

datagrid.ItemsSource = null
datagrid.ItemsSource = items;
datagrid.SelectedItem = selectedItem;
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