Question

我已经尝试过所有事情而无处可去所以我希望有人可以给我一个时刻。我只是无法获得绑定来成功地在datagrid中提取数据。

我有一个包含多个MyDataType

列的DataTable

public class MyData
{
    string nameData {get;set;}
    bool showData {get;set;}
}

MyDataType有2个属性（一个字符串，一个布尔值）我创建了一个测试DataTable

DataTable GetDummyData()
{
    DataTable dt = new DataTable("Foo");
    dt.Columns.Add(new DataColumn("AnotherColumn", typeof(MyData)));
    dt.Rows.Add(new MyData("Row1C1", true));
    dt.Rows.Add(new MyData("Row2C1", false));
    dt.AcceptChanges();
    return dt;
}

我有一个WPF DataGrid，我想展示我的DataTable。但我想要做的就是改变每个单元格的呈现方式，以便每个单元格显示[TextBlock] [Button]，并将值绑定到MyData对象，这就是我遇到麻烦的地方。

我的XAML看起来像这样

<Window.Resources>
    <ResourceDictionary>
        <DataTemplate x:Key="MyDataTemplate" DataType="MyData">
            <StackPanel Orientation="Horizontal" >
                <Button Background="Green" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="5,0,0,0" Content="{Binding Path=nameData}"></Button>
                <TextBlock Background="Green" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5,0,0,0" Text="{Binding Path=nameData}"></TextBlock>
            </StackPanel>
        </DataTemplate>
    </ResourceDictionary>
</Window.Resources>
<Grid>
    <dg:DataGrid Grid.Row="1" ItemsSource="{Binding}" AutoGenerateColumns="True"
                 x:Name="dataGrid1" SelectionMode="Single" CanUserAddRows="False"
                 CanUserSortColumns="true" CanUserDeleteRows="False" AlternatingRowBackground="AliceBlue"
                 AutoGeneratingColumn="dataGrid1_AutoGeneratingColumn" />
</Grid>

现在我所做的一切都是尝试将DataTable绑定到WPF DataGrid

dt = GetDummyData();
dataGrid1.ItemsSource = dt.DefaultView;

TextBlock和Button显示，但它们没有绑定，这使它们留空。任何人都可以告诉我他们是否知道如何解决这个问题。这应该很简单，这正是微软引导我们相信的。我在Column.CellTemplate事件期间设置了AutoGenerating，仍然没有绑定。

请帮助!!!

Answer 1

编辑：更新以反映Aran Mulholland的输入（请参阅评论）

显然DataGrid正在将整个DataRowView传递给每个单元格。这就是绑定不起作用的原因。您的DataTemplate期望DataContext的类型为MyData，但其类型为DataRowView。我提出的（有点黑客）解决方法来获取您想要的DataContext是创建一个自定义DataGridTemplateColumn，它将从DataRowView中提取必要的项目。代码如下：

<Window x:Class="DataGridTemplateColumnSample.Window1"
    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"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <ResourceDictionary>
            <DataTemplate x:Key="MyDataTemplate" DataType="DataRowView">
                <StackPanel Orientation="Horizontal">
                    <Button Background="Green" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="5,0,0,0" Content="{Binding Path=nameData}"></Button>
                    <TextBlock Background="Green" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5,0,0,0" Text="{Binding Path=nameData}"></TextBlock>
                </StackPanel>
            </DataTemplate>
        </ResourceDictionary>
    </Window.Resources>
    <Grid>
        <dg:DataGrid Grid.Row="1" AutoGenerateColumns="True" x:Name="dataGrid1" SelectionMode="Single" 
                     CanUserAddRows="False" CanUserSortColumns="true" CanUserDeleteRows="False" 
                     AlternatingRowBackground="AliceBlue"  AutoGeneratingColumn="dataGrid1_AutoGeneratingColumn"
                     ItemsSource="{Binding}" VirtualizingStackPanel.VirtualizationMode="Standard" />
    </Grid>
</Window>

using System.Data;
using System.Windows;
using Microsoft.Windows.Controls;

namespace DataGridTemplateColumnSample
{
    public partial class Window1
    {
        public Window1()
        {
            InitializeComponent();
            DataContext = GetDummyData().DefaultView;
        }

        private static DataTable GetDummyData()
        {
            var dt = new DataTable("Foo");
            dt.Columns.Add(new DataColumn("OneColumn", typeof(MyData)));
            dt.Columns.Add(new DataColumn("AnotherColumn", typeof(MyData)));
            dt.Rows.Add(new MyData("Row1C1", true), new MyData("Row1C2", true));
            dt.Rows.Add(new MyData("Row2C1", false), new MyData("Row2C2", true));
            dt.AcceptChanges();
            return dt;
        }

        private void dataGrid1_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
        {
            var column = new DataRowColumn(e.PropertyName);
            column.Header = e.Column.Header;
            column.CellTemplate = (DataTemplate)Resources["MyDataTemplate"];
            e.Column = column;
        }
    }

    public class DataRowColumn : DataGridTemplateColumn
    {
        public DataRowColumn(string column) { ColumnName = column; }
        public string ColumnName { get; private set; }
        protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
        {
            var row = (DataRowView) dataItem;
            var item = row[ColumnName];
            cell.DataContext = item;
            var element = base.GenerateElement(cell, item);
            return element;
        }
    }

    public class MyData
    {
        public MyData(string name, bool data) { nameData = name; showData = data; }
        public string nameData { get; set; }
        public bool showData { get; set; }
    }
}

注意：此方法似乎仅适用于关闭容器虚拟化或处于标准模式。如果VirtualizationMode设置为回收，则不会应用模板。

Answer 2

找到这个帖子并且遇到这里显示的代码有问题后，我在MSDN上遇到了这个帖子，它运行得更好！到目前为止，我没有看到任何虚拟化问题。

http://social.msdn.microsoft.com/Forums/en/wpf/thread/8b2e94b7-3c44-4642-8acc-851de5285062

代码：

private void dataGrid1_AutoGeneratingColumn(object sender, Microsoft.Windows.Controls.DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.PropertyType == typeof(MyData))
    {
        MyDataGridTemplateColumn col = new MyDataGridTemplateColumn();
        col.ColumnName = e.PropertyName;  // so it knows from which column to get MyData
        col.CellTemplate = (DataTemplate)FindResource("MyDataTemplate");
        e.Column = col;
        e.Column.Header = e.PropertyName;
    }
}

public class MyDataGridTemplateColumn : DataGridTemplateColumn
{
    public string ColumnName
    {
        get;
        set;
    }

    protected override System.Windows.FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
    {
        // The DataGridTemplateColumn uses ContentPresenter with your DataTemplate.
        ContentPresenter cp = (ContentPresenter)base.GenerateElement(cell, dataItem);
        // Reset the Binding to the specific column. The default binding is to the DataRowView.
        BindingOperations.SetBinding(cp, ContentPresenter.ContentProperty, new Binding(this.ColumnName));
        return cp;
    }
}

使用TemplateColumns将WPF DataGrid绑定到DataTable

2 个答案: