Question

简短：如何将DataGridColumn绑定到对象的属性，但显示前者的子属性？

长：我有一个简单的类

public class Measurement
{
    public double xPosition { get; set; }
    public double yPosition { get; set; }
    public double MeasuredValue { get; set; }
}

这是由另一个类使用的：

public class Sample : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    private string name;
    public string Name
    {
        get { return name; }
        set 
        {
            name = value;
            PropertyChanged(this, new PropertyChangedEventArgs("Name"));
        }
    }

    private Measurement experimentResult;
    public Measurement ExperimentResult
    {
        get
        {
            return experimentResult;
        }
        set
        {
            experimentResult = value;
            PropertyChanged(this, new PropertyChangedEventArgs("ExperimentResult"));
        }
}

我想在DataGrid中显示Sample的列表。在一列中是Name，另一列应该显示MeasuredValue的{{1}}。但我无法绑定ExperimentResult，因为那样不会抛出ExperimentResult.MeasuredValue事件。

所以问题是：如何显示样本的PropertyChanged？

Answer 1

没有什么可以阻止你绑定到不会在它的setter中引发PropertyChanged事件的属性 - 但是你的UI在属性的时候不会更新。至于绑定到子属性，可以通过关闭DataGrid中的自动列生成，然后显式定义所需的列来实现。在此过程中，您可以在Binding语句中引用子属性：

    <DataGrid ItemsSource="{Binding Samples}" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Name}"/>
            <DataGridTextColumn Binding="{Binding ExperimentResult.MeasuredValue}"/>
        </DataGrid.Columns>
    </DataGrid>

供参考，这是我的代码背后： public partial class MainWindow：Window { public MainWindow（） { 的InitializeComponent（）; this.DataContext = new ViewModel（）;
} }

public class ViewModel
{
    private ObservableCollection<Sample> _samples = new ObservableCollection<Sample>()
    {
        new Sample()
        {
            Name = "Sample1",
            ExperimentResult = new Measurement()
            { MeasuredValue = 100.00, xPosition = 1, yPosition = 0}
        },
        new Sample()
        {
            Name = "Sample2",
            ExperimentResult = new Measurement()
            {
                MeasuredValue = 50.00, xPosition = 2, yPosition = 3}
        }
    };

    public ObservableCollection<Sample> Samples
    {
        get
        {
            return _samples;
        }
    }
}

public class Sample : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    private string name;
    public string Name
    {
        get { return name; }
        set
        {
            name = value;
            PropertyChanged(this, new PropertyChangedEventArgs("Name"));
        }
    }

    private Measurement experimentResult;
    public Measurement ExperimentResult
    {
        get
        {
            return experimentResult;
        }
        set
        {
            experimentResult = value;
            PropertyChanged(this, new PropertyChangedEventArgs("ExperimentResult"));
        }
    }
}

public class Measurement
{
    public double xPosition { get; set; }
    public double yPosition { get; set; }
    public double MeasuredValue { get; set; }
}

在数据网格中显示子属性

1 个答案: