WPF DataGrid DataTrigger绑定DataContext属性 [英] WPF DataGrid DataTrigger Binding on DataContext property

问题描述

DataContext属性的DataTrigger绑定是什么？
我有一个这样绑定的DataGrid：

XAML：

 code>< DataGrid x：Name =dataGridGrid.Row =4Grid.ColumnSpan =2
 ItemsSource ={Binding}
 CellStyle ={StaticResource RowStateStyle }
> 
< / DataGrid> code 
 
 
在.cs中，网格绑定到一个DataTable，因此单元格的DataContext是DataRowView，其中包含作为属性行：
  //包含大量行/列的DataTable 
 dataGrid.DataContext = dataTable; 
  
 编辑： 
 
 
 
参考ASh的解决方案，我编辑了风格，并将其置于不变和修改的触发器中：
 < Style x：Key =RowStateStyleTargetType ={x：Type DataGridCell}> 
< Style.Triggers> 
< DataTrigger Binding ={Binding Path = DataContext.Row.RowState，
 RelativeSource = {RelativeSource Self}}Value =Unchanged> 
< Setter Property =ForegroundValue =Green/> 
< / DataTrigger> 
< DataTrigger Binding ={Binding Path = DataContext.Row.RowState，
 RelativeSource = {RelativeSource Self}}Value =Modified> 
< Setter Property =ForegroundValue =Yellow/> 
< / DataTrigger> 
< DataTrigger Binding ={Binding Path = Content.Text，
 RelativeSource = {RelativeSource Self}}Value =test> 
< Setter Property =ForegroundValue =Red/> 
< / DataTrigger> 
< /Style.Triggers> 
< / Style> 
  
对Content.Text的触发效果非常好，不变也是如此。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？
解决方案
 DataTrigger适用于我，如果我
 
 
 
使用 DataContext.Row.RowState 路径
 
 
 
 
使用 Mode = TwoWay  
 
 
 
 
并删除枚举名称 DataRowState 当设置值
 
 
 
 
 
 
 
 
 < DataTrigger Binding ={Binding Path = DataContext.Row.RowState，
 RelativeSource = {RelativeSource Self}}
 Value =Unchanged> 
< Setter Property =ForegroundValue =Red/> 
< / DataTrigger> 
  
 
 
 
 
 
 
我发现另一篇与此问题相关的帖子
 
 
 
  WpfToolkit DataGrid：突出显示已修改行 
 
 
 
没有通知关于 RowState 更改的默认机制。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）
 {
返回新的DataRowExt（builder）; 
} 
 
 protected override void OnRowChanged（DataRowChangeEventArgs e）
 {
 base.OnRowChanged（e）; 
 //行已更改，通知有关更改
 var r = e.Row as DataRowExt; 
 if（r！= null）
 r.OnRowStateChanged（）; 
} 
} 
  
与派生的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））; 
} 
} 
  
 
What's the correct DataTrigger binding for DataContext properties?
I have a DataGrid which is bound like this:

XAML:
<DataGrid x:Name="dataGrid" Grid.Row="4" Grid.ColumnSpan="2"
    ItemsSource="{Binding}"
    CellStyle="{StaticResource RowStateStyle}"
>
</DataGrid>
In .cs the grid is bound to a DataTable, hence the DataContext for a cell is DataRowView, containing Row as a property:
// DataTable containing lots of rows/columns
dataGrid.DataContext = dataTable; 
Edit:

Refering to ASh's solution I edited the style and put in Triggers for Unchanged and Modified:
    <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>
Triggering on Content.Text works perfectly fine, so does Unchanged. However when I modify a cell (thus DataRowState = Modified), nothing happens and the color stays green. Any solution?
解决方案
DataTrigger works for me, if I 

use DataContext.Row.RowState path
don't use Mode=TwoWay
and remove enum name DataRowState when set Value




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




I have found another post related to this issue

WpfToolkit DataGrid: Highlight modified rows

There is no default mechanism which notifies about RowState changes. But it is possible to create one in a derived dataTable class:
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();
    }
}
with a derived dataRow class:
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));
    }
}


                        
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