C# 矩形不'；t显示在编程编码的界面中

我正在通过代码构建一个界面，我需要在

TextBlocks

下添加两个

TextBlocks

和一个

Rectangle

，作为背景。使用“我的代码”时，会显示

文本块

，但

矩形

不会显示。我不知道是什么问题。你能帮忙吗

TextBlock question_textblock = new TextBlock();
question_textblock.Text = question;
question_textblock.Margin = new Thickness(10, 103, 10, 0);
question_textblock.FontWeight = FontWeights.Bold;
list_grid.Children.Add(question_textblock);

TextBlock answer_textblock = new TextBlock();
answer_textblock.Text = question;
answer_textblock.Margin = new Thickness(10, 124, 10, 0);
list_grid.Children.Add(answer_textblock);

Rectangle rect = new Rectangle();
rect.Height = 69;
rect.Fill = new SolidColorBrush(Color.FromArgb(0, 0, 0, 1));
rect.Margin = new Thickness(0, 95, 0, 0);
rect.VerticalAlignment = VerticalAlignment.Top;
list_grid.Children.Add(rect);

list_grid.UpdateLayout();

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求解：将

矩形

作为第一个子项添加到

列表中\u网格

，如下图所示，如果它仍然没有显示，请选择其他颜色填充

矩形

。这应该是您想要的：

Rectangle rect = new Rectangle();
rect.Height = 69;
rect.Fill = new SolidColorBrush(Colors.Gray);
rect.Margin = new Thickness(0, 95, 0, 0);
rect.VerticalAlignment = VerticalAlignment.Top;
list_grid.Children.Add(rect);

TextBlock question_textblock = new TextBlock();
question_textblock.Text = question;
question_textblock.Margin = new Thickness(10, 103, 10, 0);
question_textblock.FontWeight = FontWeights.Bold;
list_grid.Children.Add(question_textblock);

TextBlock answer_textblock = new TextBlock();
answer_textblock.Text = question;
answer_textblock.Margin = new Thickness(10, 124, 10, 0);
list_grid.Children.Add(answer_textblock);

list_grid.UpdateLayout();

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那是wpf还是uwp！？问题解决了！非常感谢。颜色不是问题，我的背景已经是灰色的，矩形必须是白色的。