Question

只使用一个DataGrid就可以了。

但是在我的示例代码中，我定义了一个复选框（窗口的左上角）来切换ListView项目中DataGrids的ReadOnly属性的状态。 ListView DataGrids的ReadOnly状态正在发生变化但存在副作用：

在ListBox之前定义的DataGrid也在改变其ReadOnly状态。
ListBox中定义的DataGrids也遵循ListView中定义的Datagrids的ReadOnly属性。

在人们讲述重复之后更新：只是为了让人们知道。出现此问题的原因是使用相同的ItemsSource。引擎盖下将使用相同的CollectionView。与CollectionView相关的每个功能（例如排序顺序或IsReadOnly属性）都会受到具有相同ItemsSource的每个控件的影响（引擎盖下的Same CollectionView）。

为什么？

重现问题...只需执行正常的WPF应用程序并应用2个修改：

将MainWindow xaml更改为：

<ScrollViewer>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height ="Auto"></RowDefinition>
            <RowDefinition Height ="Auto"></RowDefinition>
            <RowDefinition Height ="Auto"></RowDefinition>
            <RowDefinition Height ="Auto"></RowDefinition>
            <RowDefinition Height ="Auto"></RowDefinition>
            <RowDefinition Height ="Auto"></RowDefinition>
        </Grid.RowDefinitions>

        <CheckBox Name="CheckBox"></CheckBox>

        <TextBlock Grid.Row="1" Text="{Binding Families.Count}"></TextBlock>
        <!--<Button Click="ButtonBase_OnClick"></Button>-->

        <DataGrid Grid.Row="2" ItemsSource="{Binding Familiy1.Persons}"
                IsReadOnly="True">
        </DataGrid>

        <DataGrid Grid.Row="3" ItemsSource="{Binding Familiy1.Persons}"
                IsReadOnly="false">
        </DataGrid>

        <ListBox Grid.Row="4" HorizontalContentAlignment="Stretch" 
                ScrollViewer.HorizontalScrollBarVisibility="Disabled" 
                ItemsSource="{Binding Families}" Background="Khaki">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <GroupBox Header="ListBox">
                        <DataGrid ItemsSource="{Binding Persons}">
                        </DataGrid>
                    </GroupBox>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

        <ListView Grid.Row="5" 
                ItemsSource="{Binding Families}"
                Margin="0,24,0,0" Background="Thistle"
                ScrollViewer.HorizontalScrollBarVisibility="Disabled">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <GroupBox>
                        <GroupBox.Header>
                            <TextBlock Text="ListView"></TextBlock>
                        </GroupBox.Header>

                        <DataGrid ItemsSource="{Binding Persons}"
                                Background="Red" AutoGenerateColumns="True"
                                ColumnWidth="Auto"
                                  IsReadOnly="{Binding IsChecked , ElementName=CheckBox}">
                        </DataGrid>
                    </GroupBox>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </Grid>
</ScrollViewer>

此外，添加以下MainWindowModel.cs类：

using System.Collections.ObjectModel;
using System.ComponentModel;


namespace WpfDataGridIsReadOnlyBug
{ 
public class Person : INotifyPropertyChanged
{
    private int _age;
    private string _name;

    public string Name
    {
        get { return _name; }
        set { _name = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name")); }
    }

    public int Age
    {
        get { return _age; }
        set { _age = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Age")); }
    }

    public Person()
    {

    }

    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

public class Family : INotifyPropertyChanged
{
    private string _name;
    public string Name
    {
        get { return _name; }
        set { _name = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name")); }
    }

    public Family()
    {

    }

    public Family(string name)
    {
        Name = name;
    }
    public ObservableCollection<Person> Persons { get; } = new ObservableCollection<Person>();

    public event PropertyChangedEventHandler PropertyChanged;

}

public class MainWindowModel
{
    public ObservableCollection<Family> Families { get; } = new ObservableCollection<Family>();

    public Family Familiy1
    {
        get { return Families[0]; }
    }

    public MainWindowModel()
    {
        Family family = new Family("Family 1");
        family.Persons.Add(new Person("Eric", 50));
        family.Persons.Add(new Person("Isabel Lucas", 35));
        Families.Add(family);

        family = new Family("Family 2");
        family.Persons.Add(new Person("Candice Swanopel", 25));
        Families.Add(family);
    }
}
}

WPF Microsoft DataGrid具有奇怪的“IsReadOnly”行为。为什么？

0 个答案: