C＃ - WPF中DataGridColumnHeader

Question

使用DataTrigger如何使用DataTriggers在DataGridColumHeader？下面的代碼不起作用。有人知道我該如何解決這個問題？

<DataGridTextColumn.HeaderStyle> 
    <Style TargetType="{x:Type DataGridColumnHeader}"> 
    <Setter Property="Background" Value="#FFFFBD21" /> 
    <Style.Triggers> 
     <DataTrigger Binding="{Binding HasChangedRows}" Value="false"> 
     <Setter Property="Background" Value="#66FFBD21"/> 
     </DataTrigger> 
    </Style.Triggers> 
    </Style> 
</DataGridTextColumn.HeaderStyle> 

Answer 1

檢查這個代碼在一個新的解決方案，你會看到，如果HasChangedRows綁定正確設置它應該工作。您可以使用複選框來改變HasChangedRows

背後的價值

<Window x:Class="WpfApplication10.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   
    Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded"> 
<StackPanel> 
    <CheckBox IsThreeState="False" IsChecked="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=HasChanges, Mode=TwoWay}" 
       Content="{Binding RelativeSource={RelativeSource Mode=Self}, Path=IsChecked}"/> 

    <DataGrid Name="MainGrid" AutoGenerateColumns="False"> 
     <DataGrid.Resources> 
      <Style TargetType="{x:Type DataGridColumnHeader}" x:Key="customheaderstyle"> 
       <Style.Triggers> 
        <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=HasChanges}" Value="false"> 
         <Setter Property="Background" Value="#66FFBD21"/> 
        </DataTrigger> 
        <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=HasChanges}" Value="true"> 
         <Setter Property="Background" Value="#FFFFBD21" /> 
        </DataTrigger> 
       </Style.Triggers> 
      </Style> 
     </DataGrid.Resources> 
     <DataGrid.Columns> 
      <DataGridTextColumn HeaderStyle="{StaticResource customheaderstyle}" Binding="{Binding}"/> 
     </DataGrid.Columns> 
    </DataGrid> 
</StackPanel> 
</Window> 

和代碼：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
using System.Windows.Navigation; 
using System.Windows.Shapes; 
using System.ComponentModel; 

namespace WpfApplication10 
{ 
    public partial class MainWindow : Window, INotifyPropertyChanged 
    { 

    #region INotifyPropertyChanged 

    public event PropertyChangedEventHandler PropertyChanged; 
    protected void NotifyPropertyChange(string propertyName) 
    { 
     if (PropertyChanged != null) 
     { 
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
     } 
    } 

    #endregion 


    private bool _HasChanges = false; 
    public bool HasChanges 
    { 
     get { return this._HasChanges; } 
     set 
     { 
      this._HasChanges = value;     
      NotifyPropertyChange("HasChanges"); 

     } 
    } 

    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    private void Window_Loaded(object sender, RoutedEventArgs e) 
    { 
     String[] list = { "1", "2", "3", "4" }; 
     this.MainGrid.ItemsSource = list;    
    } 
    } 
} 

最終結果：

而且