Question

有谁知道是否可以将折线绑定到自定义对象的集合？

例如，我有一个类似的类：

public class MyDataClass{
    public double Value { get; set; } //I'd like to map this to a polyline point's x value
    public double Position { get; set; } //I'd like to map this to a polyline point's y value
}

我想将折线绑定到这些对象的集合，并将Value属性转换为X，将Position属性转换为Y.

谢谢！

Answer 1

虽然Joseph已经回答过，但我想添加一个更简单，更灵活的Convert方法实现，它使用LINQ Select方法：

using System.Linq;
...

public object Convert(
    object value, Type targetType, object parameter, CultureInfo culture)
{
    var myDataCollection = value as IEnumerable<MyDataClass>;

    if (myDataCollection == null)
    {
        return null;
    }

    return new PointCollection(
        myDataCollection.Select(p => new Point(p.Value, p.Position)));
}

Answer 2

Polyline期待PointCollection Points为了绘制它们，您可以使用转换器来确保： XAML

<Polyline Stretch="Fill" Grid.Column="0"
      Name="Polyline" Stroke="Red"
      Points="{Binding Points,Converter={StaticResource ToPointConverter}}">
    </Polyline>

转换器实现如下：

public class ToPointConverter:IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null) return null;            
        var pointCollection=new PointCollection();
        (value as List<MyDataClass>).ForEach(x=>{pointCollection.Add(new Point()
        {
            X = x.Value,
            Y = x.Position
        });});
        return pointCollection;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

并在您的代码隐藏或您的Viewmodel中定义List<MyDataClass>属性：

public List<MyDataClass> Points { get; set; }

不要忘记设置DataContext并在资源中设置ToPointConverter。

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wpf - 将折线绑定到自定义类

2 个答案: