在獲取wpf自定義組件的寬度和高度的時候，如果直接在InitializeComponent();后面用this.Width,和this.ActualWidth會得到Nan和0，因為組件還沒有被計算大小。

要獲得組件的寬度和高度可以添加Loaded事件的響應函數，在事件函數里面在用this.Width就可以得到組件的寬度。

public lineNet() {InitializeComponent();Loaded += delegate{Line line11 = new Line();Line line12 = new Line();Line line21 = new Line();Line line22 = new Line();//定義參考線顏色寬度line11.StrokeThickness = 2;line11.Stroke = Brushes.Blue;line12.StrokeThickness = 2;line12.Stroke = Brushes.Blue;line21.StrokeThickness = 2;line21.Stroke = Brushes.Blue;line22.StrokeThickness = 2;line22.Stroke = Brushes.Blue;//定義參考線起止坐標line11.X1 = 0;line11.Y1 = 0;line11.X2 = this.width;line11.Y2 = 0;line12.X1 = 0;line12.Y1 = this.height;line12.X2 = this.width;line12.Y2 = this.height;line21.X1 = 0;line21.Y1 = 0;line21.X2 = 0;line21.Y2 = this.height;line22.X1 = this.width;line22.Y1 = 0;line22.X2 = this.width;line22.Y2 = this.height;MainCanvas.Children.Add(line11);MainCanvas.Children.Add(line12);MainCanvas.Children.Add(line21);MainCanvas.Children.Add(line22);};}

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轉載于:https://www.cnblogs.com/wangjixianyun/archive/2012/12/12/2814246.html

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