我在XAML中设置了一个StackPanel，其Orientation =“Horizontal” . 当我向它的儿童添加项目时，它们不会以预先设定的大小进行渲染 . 我正在添加的项是从Canvas派生的类，其中Image（Stretch = Uniform）和垂直StackPanel中的TextBlock是唯一的子项 . 我明确设置了画布的宽度和高度，我可以在调试时看到正确的值，但它们渲染得更大（看起来像拉伸以适合？） . 我究竟做错了什么？

下面的代码 - 抱歉格式化，但尝试用代码引号括起来似乎不适用于我的Mac！

<Border BorderThickness="4" BorderBrush="DarkGray" Grid.Row="0"
        CornerRadius="0, 12, 0, 0">
   <ScrollViewer HorizontalScrollBarVisibility="Auto" 
                 VerticalScrollBarVisibility="Disabled" x:Name="navScroller">
      <StackPanel x:Name="navPanel" Background="White" Orientation="Horizontal"> 
          <Button Style="{StaticResource GlassButton}" Height="30" 
                  HorizontalAlignment="Left"  Name="homeBtn"
                  VerticalAlignment="Center" Width="30"
                  Click="HomeBtn_Click" Margin="4,4,4,4" >
              <Image Source="{StaticResource homeImg}"></Image>
           </Button>
      </StackPanel>
   </ScrollViewer>
</Border>

从Canvas派生的类： -

public IconView(string filePath, double sze)
{
    this._myPath = filePath;
    this.IsDir = isDir;
    mySize = sze;
    //Trace.WriteLine(_myPath);
    string foldername = System.IO.Path.GetFileName(FilePath);
    TextBlock tb = new TextBlock();
    tb.Text = foldername;
    tb.HorizontalAlignment = System.Windows.HorizontalAlignment.Center;
    tb.VerticalAlignment = System.Windows.VerticalAlignment.Top;
    StackPanel sp = new StackPanel();
    sp.Orientation = Orientation.Vertical;
    sp.Children.Add(GetThumbnail());
    sp.Children.Add(tb);
    this.Children.Add(sp);
    this.Width = mySize;
    this.Height = mySize * 1.4;
    this.PreviewMouseUp += IconView_PreviewMouseUp;
    this.PreviewTouchUp += IconView_PreviewTouchUp;

    this.Margin = new Thickness(10);

}

添加到StackPanel： -

IconView iv = new IconView(path, 20);
Trace.WriteLine("iv size = " + iv.Width + " x " + iv.Height);
iv.VerticalAlignment = System.Windows.VerticalAlignment.Top;
iv.Height = 20;
iv.Width = 20;
iv.Margin = new Thickness(20,10,20,10);
navPanel.Children.Add(iv);
c# wpf xaml