WPF DataGrid DataTrigger绑定DataContext属性

本文介绍了WPF DataGrid DataTrigger绑定DataContext属性的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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)); } }