Question

DataContext属性的正确DataTrigger绑定是什么？我有一个像这样绑定的DataGrid：

XAML：

<DataGrid x:Name="dataGrid" Grid.Row="4" Grid.ColumnSpan="2"
    ItemsSource="{Binding}"
    CellStyle="{StaticResource RowStateStyle}"
>
</DataGrid>

在.cs中，网格绑定到DataTable，因此单元格的DataContext是DataRowView，包含Row作为属性：

// DataTable containing lots of rows/columns
dataGrid.DataContext = dataTable;

修改

参考ASh的解决方案，我编辑了样式并输入了触发器以保持不变和修改：

    <Style x:Key="RowStateStyle" TargetType="{x:Type DataGridCell}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=DataContext.Row.RowState,
                RelativeSource={RelativeSource Self}}" Value="Unchanged">
                <Setter Property="Foreground" Value="Green" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Path=DataContext.Row.RowState,
                RelativeSource={RelativeSource Self}}" Value="Modified">
                <Setter Property="Foreground" Value="Yellow" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Path=Content.Text,
                RelativeSource={RelativeSource Self}}" Value="test">
                <Setter Property="Foreground" Value="Red" />
            </DataTrigger>
        </Style.Triggers>
    </Style>

触发Content.Text工作得非常好，Unchanged也是如此。但是，当我修改单元格（因此DataRowState = Modified）时，没有任何反应，颜色保持绿色。任何解决方案？

Answer 1

DataTrigger适用于我，如果我

使用DataContext.Row.RowState路径
请勿使用Mode=TwoWay
并在设置值

DataRowState

<DataTrigger Binding="{Binding Path=DataContext.Row.RowState,
             RelativeSource={RelativeSource Self}}" 
             Value="Unchanged">
    <Setter Property="Foreground" Value="Red" />
</DataTrigger>

我找到了另一篇与此问题相关的帖子

WpfToolkit DataGrid: Highlight modified rows

没有默认机制通知RowState更改。但是可以在派生的dataTable类中创建一个：

public class DataTableExt: DataTable
{
    protected override DataRow NewRowFromBuilder(DataRowBuilder builder)
    {
        return new DataRowExt(builder);
    }

    protected override void OnRowChanged(DataRowChangeEventArgs e)
    {
        base.OnRowChanged(e);
        // row has changed, notifying about changes
        var r = e.Row as DataRowExt;
        if (r!= null)
            r.OnRowStateChanged();
    }
}

使用派生的dataRow类：

public class DataRowExt: DataRow, INotifyPropertyChanged
{
    protected internal DataRowExt(DataRowBuilder builder) : base(builder)
    {
    }

    internal void OnRowStateChanged()
    {
        OnPropertyChanged("RowState");
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}

WPF DataGrid DataTrigger绑定DataContext属性

1 个答案: