使用TemplateColumns将WPF DataGrid绑定到DataTable

Question

我已经尝试了一切,无处可去,所以我希望有人可以给我一点时间.我根本无法获得绑定来成功地拉取数据网格中的数据.

我有一个DataTable,其中包含多个MyDataType列

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>

现在我加载的所有内容都是尝试将DataTable绑定到WPF DataGrid

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

TextBlock和Button显示,但它们不绑定,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Column.CellTemplate在AutoGenerating活动期间设置了并且仍然没有绑定.

请帮忙!!!

Answer 1

编辑:更新以反映Aran Mulholland的输入(请参阅注释)

显然,DataGrid正在将整个传递DataRowView到每个单元格.这就是绑定不起作用的原因.你DataTemplate期望它是DataContext类型MyData,但它是类型DataRowView.我提出的(有点hack-ish)解决方法来获得DataContext你想要的是创建一个自定义DataGridTemplateColumn,将从中提取必要的项目DataRowView.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容器虚拟化关闭或标准模式.如果VirtualizationMode设置为Recycling,则不应用模板.

Answer 2

找到这个线程并且在这里显示的代码有问题之后,我在MSDN上遇到了这个线程,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

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;
    }
}