矩形形状不会使用画布更新左侧或顶部位置

Question

它不会改变位置，即使我更改下面的值 50，位置也会在运行时固定：

System.Windows.Shapes.Rectangle myRectangle = new System.Windows.Shapes.Rectangle();

mainGrid.Children.Add(myRectangle);

Canvas.SetLeft(myRectangle, 50);
Canvas.SetTop(myRectangle, 50);

myRectangle.Height = 100;
myRectangle.Width = 100;

myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;

Answer 1

这是针对您的问题的 2 种解决方案

1) 使用画布

var myRectangle = new System.Windows.Shapes.Rectangle();

var mainCanvas = new Canvas();
mainGrid.Children.Add(mainCanvas);

mainCanvas.Children.Add(myRectangle);
Canvas.SetLeft(myRectangle, 50);
Canvas.SetTop(myRectangle, 50);

myRectangle.Height = 100;
myRectangle.Width = 100;
myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;

2) 仅使用网格

var myRectangle = new System.Windows.Shapes.Rectangle();

mainGrid.Children.Add(myRectangle);
myRectangle.Margin = new Thickness(50, 50, 0, 0);
myRectangle.HorizontalAlignment = HorizontalAlignment.Left;
myRectangle.VerticalAlignment = VerticalAlignment.Top;

myRectangle.Height = 100;
myRectangle.Width = 100;
myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;