c# - 如何在 xaml 中绑定(bind)到 DataGridCheckBoxColumn 的 IsReadOnly 属性？

Question

我正在尝试绑定(bind)到 IsReadOnly 属性，但它似乎不起作用。我怎么能做到这一点？我的方法有什么问题？下面是复制问题的示例代码。

更新:添加了隐藏文件的代码...我有一个可观察的集合作为隐藏代码的属性挂起，用作数据上下文。问题不在于属性更改时，即使我第一次绑定(bind)它时，选中的属性已正确绑定(bind)，但 IsReadonly 不是。

public class ModelClass:INotifyPropertyChanged
{
    private bool m_IsReadOnly;
    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string propName)
    {
        if(PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propName));

        }
    }
    public bool IsReadOnly
    {
        get { return m_IsReadOnly; } 
        set
        {
            m_IsReadOnly = value;
            OnPropertyChanged("IsReadOnly");
        }
    }
}

---

<Window x:Class="TestWpfApp.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:TestWpfApp"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525"
    DataContext="{Binding RelativeSource={RelativeSource Self}}" >

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="63*"/>
        <RowDefinition Height="17*"/>
    </Grid.RowDefinitions>
    <DataGrid x:Name="modelClassDataGrid"
              AutoGenerateColumns="False" 
              EnableRowVirtualization="True" 
              ItemsSource="{Binding Models}" 
              Grid.RowSpan="2" RowDetailsVisibilityMode="VisibleWhenSelected">
        <DataGrid.Columns>
            <DataGridCheckBoxColumn x:Name="col1" 
                                    Binding="{Binding IsReadOnly}" 
                                    IsReadOnly="{Binding IsReadOnly}" //doesn't work
                                    Header="With Binding" 
                                    Width="SizeToHeader"/>
            <DataGridCheckBoxColumn x:Name="col2" 
                                    Binding="{Binding IsReadOnly}" 
                                    IsReadOnly="True"
                                    Header="Without Binding" 
                                    Width="SizeToHeader"/>
        </DataGrid.Columns>
    </DataGrid>
    <DataGrid x:Name="dataGrid" HorizontalAlignment="Left" Margin="324,163,0,0" VerticalAlignment="Top"/>
</Grid>

  public partial class MainWindow : Window
{
    private ObservableCollection<ModelClass> _models = new ObservableCollection<ModelClass>(new List<ModelClass>()
    {
        new ModelClass() {IsReadOnly = false},
        new ModelClass() {IsReadOnly = true},
        new ModelClass() {IsReadOnly = false},
    });

    public MainWindow()
    {
        InitializeComponent();
    }

    public ObservableCollection<ModelClass> Models
    {
        get { return _models; }
    }
}

Answer 1

因为<DataGridCheckBoxColumn>里面有两种元素样式, 你需要指定 IsHitTestVisible="False" ElementStyle 的参数。

 <DataGridCheckBoxColumn x:Name="col1" 
                                Binding="{Binding IsReadOnly}" 
                                IsReadOnly="{Binding IsReadOnly}"
                                ElementStyle="{StaticResource ReadOnlyCheckBoxStyle}"  
                                Header="With Binding" 
                                Width="SizeToHeader"/>

还有像这样的 ReadOnlyCheckBoxStyle

<Style x:Key="ReadOnlyCheckBoxStyle" TargetType="{x:Type CheckBox}">
      <Setter Property="IsHitTestVisible" Value="False"/> 
</Style>