Question

我有一个统一的网格，动态添加了矩形。我想删除一个特定的矩形，但在尝试将其传递给Remove方法时出现以下错误：

无法转换为＆＃39; System.Drawing.Rectangle＆＃39;到＆＃39; System.Windows.UIElement＆＃39;

我的代码是：

        Rectangle swatch = (Rectangle)ug_Thumbnails.FindName("s_" + _instance);
        ug_Thumbnails.Children.Remove(swatch);

我尝试了投射，但是发现了一个错误，说你无法做到。

编辑：根据请求，这里是创建矩形的代码：

        System.Windows.Shapes.Rectangle swatch = new System.Windows.Shapes.Rectangle();
        swatch.Width = 50;
        swatch.Height = 50;
        swatch.Margin = new Thickness(0, 5, 5, 0);
        swatch.StrokeThickness = 1;
        swatch.Stroke = System.Windows.Media.Brushes.Gray;
        swatch.Name = "s_" + name.ToString();
        double groupsize = 100 / colors.Count();
        DrawingBrush blackBrush = new DrawingBrush();
        DrawingGroup checkersDrawingGroup = new DrawingGroup();
        List<SolidColorBrush> brushes = colors;
        double location = 0;
        for (int i = 0; i < colors.Count(); i++)
        {
            GeometryDrawing drawing = new GeometryDrawing(brushes[i], null,
                new RectangleGeometry(new Rect(location, 0, groupsize, groupsize)));
            checkersDrawingGroup.Children.Add(drawing);
            location += groupsize;
        }
        blackBrush.Drawing = checkersDrawingGroup;
        swatch.Fill = blackBrush;
        swatch.MouseUp += new MouseButtonEventHandler(loadSwatchResources);

        ug_Thumbnails.Children.Add(swatch);

Answer 1

尝试在WPF中引用矩形时，需要在System.Windows.Shapes中使用Rectangle。这特别适用于WPF中的矩形，因此与System.Drawing矩形类略有不同。您应该能够转换为此版本的矩形，因为它派生自FrameworkElement。有关详细信息，请参阅http://msdn.microsoft.com/en-us/library/system.windows.shapes.rectangle(v=vs.110).aspx。

无法在WPF中删除子项

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