Question

在WPF表单上，我有一个DataGrid和几个TextBox元素，它们使用双向绑定绑定到单个对象中包含的不同属性。所有数据都显示得很好，TextBox元素中的数据将允许用户编辑和更新而不会出现问题。当我在DataGrid中编辑一个值时，我会得到一个＆＃34;双向绑定需要Path或XPath＆＃34;离开编辑过的单元格时出现异常知道为什么吗？

数据对象定义为：

public class Options : INotifyPropertyChanged
{
    private ObservableCollection<string> ignoreList;
    private decimal minimumPrice;
    private decimal maximumPrice;
    private int maximumDimension;
    private int targetMargin;

    public Options()
    {
        this.IgnoreList = new ObservableCollection<string>();
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public ObservableCollection<string> IgnoreList
    {
        get
        {
            return this.ignoreList;
        }
        set
        {
            this.ignoreList = value;
            this.OnPropertyChanged("IgnoreList");
        }
    }

    public decimal MinimumPrice
    {
        get
        {
            return this.minimumPrice;
        }
        set
        {
            this.minimumPrice = value;
            this.OnPropertyChanged("MinimumPrice");
        }
    }

    public decimal MaximumPrice
    {
        get
        {
            return this.maximumPrice;
        }
        set
        {
            this.maximumPrice = value;
            this.OnPropertyChanged("MaximumPrice");
        }
    }

    public int MaximumDimension
    {
        get
        {
            return this.maximumDimension;
        }
        set
        {
            this.maximumDimension = value;
            this.OnPropertyChanged("MaximumDimension");
        }
    }

    public int TargetMargin
    {
        get
        {
            return this.targetMargin;
        }
        set
        {
            this.targetMargin = value;
            this.OnPropertyChanged("TargetMargin");
        }
    }

    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = this.PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }
}

XAML是：

<Grid Name="optionsGrid">
    <TextBox x:Name="minimumPrice" HorizontalAlignment="Left" Height="30" Margin="251,11,0,0" TextWrapping="Wrap" Text="{Binding MinimumPrice}" VerticalAlignment="Top" Width="74"/>
    <TextBox x:Name="maximumPrice" HorizontalAlignment="Left" Height="30" Margin="251,61,0,0" TextWrapping="Wrap" Text="{Binding MaximumPrice}" VerticalAlignment="Top" Width="74"/>
    <TextBox x:Name="maximumDimension" HorizontalAlignment="Left" Height="30" Margin="251,112,0,0" TextWrapping="Wrap" Text="{Binding MaximumDimension}" VerticalAlignment="Top" Width="74"/>
    <TextBox x:Name="targetMargin" HorizontalAlignment="Left" Height="30" Margin="251,161,0,0" TextWrapping="Wrap" Text="{Binding TargetMargin}" VerticalAlignment="Top" Width="74"/>
    <Button x:Name="cancelButton" Content="Cancel" HorizontalAlignment="Left" Margin="170,231,0,0" VerticalAlignment="Top" Width="76" Click="cancelButton_Click" Height="20"/>
    <Button x:Name="okButton" Content="OK" HorizontalAlignment="Left" Margin="251,231,0,0" VerticalAlignment="Top" Width="76" Height="20" Click="okButton_Click"/>
    <DataGrid x:Name="ignoreGrid" HorizontalAlignment="Left" Height="220" Margin="10,31,0,0" IsReadOnly="False" ItemsSource="{Binding IgnoreList, Mode=TwoWay}" CanUserAddRows="True" CanUserDeleteRows="True" HeadersVisibility="None" AutoGenerateColumns="False" VerticalAlignment="Top" Width="146">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="ignoreList" Binding="{Binding Path=.}" Width="144"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

背后代码的相关部分是：

public OptionsDialog(OptionsController options)
{
    this.InitializeComponent();

    Options options = new Options();
    options.MaximumDimension = 77;
    options.MinimumPrice = 0.50m;
    options.MaximumPrice = 99.99m;
    options.TargetMargin = 49;
    options.IgnoreList.Add("aaa");
    options.IgnoreList.Add("bbb");

    this.optionsGrid.DataContext = options;
}

更新1

根据HamletHakobyan的建议更改了DataGridTextColumn定义：

<DataGridTextColumn x:Name="ignoreList" IsReadOnly="False" Binding="{Binding Path=., Mode=TwoWay}"  Width="144"/>

错误已停止。但是现在当剩下编辑的单元格时，单元格只会恢复为原始值。作为一个实验，我生成了另一个TextBlock并将IgnoreList [0]绑定到此。它工作得很好。这告诉我，问题在于数据网格定义而不是源数据定义或绑定。然而，我无法向前迈进。

更新2

我注意到的其他可能相关的是，即使CanUserAddRows =＆＃34; True＆＃34;，数据网格也不会在底部显示空白行。好像网格以某种方式被锁定了。然而，通过单击一行并点击Delete键，我可以成功删除行，我可以通过代码向IgnoreList添加行。我还将调试器指向了Options类中IgnoreList的setter。当我更改单元格的值时，不会触发。不知道为什么。

绑定DataGrid不更新但绑定到同一对象的TextBox会

0 个答案: