c# - 命令 - 从 DataGridTemplateColumn 绑定(bind)

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}" />

这是行不通的。如何绑定(bind)到 SequenceCommand(MyViewModel、ICommand SequenceCommand)？

我不会使用框架(mvvm light 工具包、prism 等)。

Answer 1

CellTemplate 的 DataTemplate 中的 DataContext 将更改为绑定(bind)到未找到 SequenceCommand 的当前项目。您必须将 RelativeSource 设置为 DataGrid 并为 DataContext.SequenceCommand 设置 Path，如下所示:

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