In wpf ,how to complement image fit to window and show in actual size

Question

<Image Source="{Binding ImageSource}"/>

 OpenFileDialog ofdimg=new OpenFileDialog();
            ofdimg.Filter = "Image Files (*.jpg;*.jpep)|*.jpg;*.jpeg;*.bmp;*.png;*.tif;*.gif;|All Files (*.*)|*.*";
            ofdimg.ShowDialog();
            string ImgPath = ofdimg.FileName;
            BitmapSource bm = new BitmapImage(new Uri(ImgPath));
            ImageSource = bm;		
		BitmapImage mybm = new BitmapImage();
                mybm.BeginInit();
                mybm.UriSource = new Uri(ImgPath);
                mybm.DecodePixelWidth = bm.PixelWidth;//actual size
                mybm.EndInit();
                ImageSource = mybm;	

here it shows should be actual size , how can i make it to fit to window size,

Answer 1

你好，

我们可以使用 ScaleTransform 去实现缩放效果，ScaleX和ScaleY可以绑定到Slider的Value:

<Image Source="{Binding ImageSource}">
            <Image.RenderTransform>
                <ScaleTransform x:Name="scale" ScaleX="{Binding Value, ElementName=slider1}" ScaleY="{Binding Value, ElementName=slider1}" CenterX="0.5" CenterY="0.5"/>
            </Image.RenderTransform>
        </Image>
<Slider Grid.Row="1" Name="slider1" Maximum="1" Minimum="0" Value="1" TickPlacement="Both" />

截图：

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Answer 2

谢谢，如果要调整image适应窗口大小的话，应该先获得窗口的size，然后保持图片的比例，调整到slider合适的值，是这样的吗?wpf中有类似的可以实现的方法吗？就像你上面一样可以不用后台代码， 比如调整image的stretch属性

Answer 3

谢谢，如果要调整image适应窗口大小的话，应该先获得窗口的size，然后保持图片的比例，调整到slider合适的值，是这样的吗?wpf中有类似的可以实现的方法吗？就像你上面一样可以不用后台代码， 比如调整image的stretch属性

你好，

>>如果要调整image适应窗口大小的话，应该先获得窗口的size，然后保持图片的比例，调整到slider合适的值，是这样的吗?wpf中有类似的可以实现的方法吗？就像你上面一样可以不用后台代码， 比如调整image的stretch属性

默认Image控件的Stretch属性为 Uniform，如果你调整窗口大小，让Image控件自动调整大小的话，是可以发现图片能自适应的。

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