通过设置Image控件Stretch属性的值可以控制图片的显示形式：
包含的值：None、Fill、Uniform、UniformToFill
1 <Grid x:Name="LayoutRoot" Background="White" Height="489" Width="603"> 2 <Image Height="150" HorizontalAlignment="Left" Name="image1" Stretch="None" VerticalAlignment="Top" Width="200" Source="/SilverlightApplication1;component/Images/2009011911345229.jpg" Margin="10,14,0,0" /> 3 <Image Height="150" HorizontalAlignment="Left" Margin="325,14,0,0" Name="image2" Stretch="Fill" VerticalAlignment="Top" Width="200" Source="/SilverlightApplication1;component/Images/2009011911345229.jpg" Grid.ColumnSpan="3" /> 4 <Image Height="150" HorizontalAlignment="Left" Margin="10,239,0,0" Name="image3" Stretch="Uniform" VerticalAlignment="Top" Width="200" Source="/SilverlightApplication1;component/Images/2009011911345229.jpg" /> 5 <Image Height="150" HorizontalAlignment="Left" Margin="325,239,0,0" Name="image4" Stretch="UniformToFill" VerticalAlignment="Top" Width="200" Source="/SilverlightApplication1;component/Images/2009011911345229.jpg" Grid.ColumnSpan="3" /> 6 <TextBlock Height="67" HorizontalAlignment="Left" Margin="12,166,0,0" Name="textBlock1" VerticalAlignment="Top" Width="207" TextWrapping="Wrap"> 7 <TextBlock.Text> 8 None：图片直接加载到Image控件中，不进行拉伸，如果Image控件的大小是100X100 而图片的大小为1000X1000 则只显示顶部的100X100 9 </TextBlock.Text> 10 </TextBlock> 11 <TextBlock Height="67" HorizontalAlignment="Left" Margin="325,166,0,0" Name="textBlock2" VerticalAlignment="Top" Width="200" TextWrapping="Wrap" Grid.ColumnSpan="3"> 12 <TextBlock.Text> 13 Fill：图片会拉伸或缩小以适应Image控件 长宽比可能改变 14 </TextBlock.Text> 15 </TextBlock> 16 <TextBlock Height="67" HorizontalAlignment="Left" Margin="12,395,0,0" Name="textBlock3" TextWrapping="Wrap" VerticalAlignment="Top" Width="200" > 17 <TextBlock.Text> 18 Uniform：图片会拉伸到最佳大小（不一定充满整个Image控件）保持长宽比不变 19 </TextBlock.Text> 20 </TextBlock> 21 <TextBlock Height="67" HorizontalAlignment="Left" Margin="325,395,0,0" Name="textBlock4" VerticalAlignment="Top" Width="200" TextWrapping="Wrap" Grid.ColumnSpan="3"> 22 UniformToFill：图片会在不改变长宽比的前提下拉伸，它会充满整个Image控件 但可能被裁减 23 </TextBlock> 24 </Grid>