命令 - 从 DataGridTemplateColumn 绑定

Question

<DataGrid ItemsSource="{Binding Occerences}" 
          AutoGenerateColumns="False"
          IsReadOnly="True">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Start index" Binding="{Binding Start}" />
        <DataGridTextColumn Header="End index"  />
        <DataGridTextColumn Header="Length"  />
        <DataGridTextColumn Header="Pattern"  />
        <DataGridTemplateColumn Header="Sequence">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button Content="Sequence" Command="{Binding SequenceCommand}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Export">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button Content="Export" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>       
</DataGrid> 

<Button Content="Sequence" Command="{Binding SequenceCommand}" />

这不起作用。如何绑定到 SequenceCommand（MyViewModel、ICommand SequenceCommand）？

我不能使用框架（mvvm light 工具包、棱镜等）。

Answer 1

DataTemplate 中 CellTemplate 的 DataContext 将更改为绑定到未找到 SequenceCommand 的当前项。您必须为DataGrid 设置一个RelativeSource 并为DataContext.SequenceCommand 设置Path，如下所示：

<Button Content="Sequence" 
        Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid},
        Path=DataContext.SequenceCommand}" />