BitmapImage旋轉

Question

在我的模型視圖中，我有一個ObservableCollection的BitmapImages，顯示在我的視圖的列表框中。我想旋轉ObservableCollection中的選定圖像。

Answer 1

在您的DateTemplate中定義如何顯示圖像（如列表框項），您可以使用.RenderTransform屬性來轉換/旋轉控件。

示例按鈕：

<Button 
      <Button.RenderTransform> 
       <RotateTransform CenterX="0" CenterY="0" Angle="45"/> 
      </Button.RenderTransform> 
      Test</Button> 

Have a read more on How to Rotate an object? MSDN Article

Answer 2

好了，想通了，你可以讓我知道，如果事情看起來愚蠢

//Create a transform 
TransformedBitmap tBmp = new TransformedBitmap(); 
tBmp.BeginInit(); 

//Set the source = to the image currently selected 
tBmp.Source = _Scans[_selectedImage].MyImage; 
RotateTransform rt = new RotateTransform(180); 
tBmp.Transform = rt; 
tBmp.EndInit(); 

//Create a new source after the transform 
BitmapSource s1 = tBmp; 
BitmapImage bi = BitmapSourceToBitmapImage(s1); 

//Add create the item and replace the current item in the collection 
//edited according to comment 
//ScannedImages s = new ScannedImages(); 
//s.MyImage = bi; 
//_Scans[_selectedImage] = s; 
Scans[_selectedImage].MyImage = BitmapSourceToBitmapImage(s1);