using System.Windows.Controls;
using System.Windows.Documents;
...
  
FileInfo imgInfo = new FileInfo(path_to_img)

// Control type
Image myImage = new Image();

BitmapImage bitmapImg = new BitmapImage();
bitmapImg.BeginInit()
bitmap.UriSource = new Uri(imgInfo.FullName);
bitmap.EndInit();

myImage.Source = bitmapImg;

// Changing our rotation transform's origin from top left to center of image
transform.CenterX = myImage.ActualWidth / 2;
transform.CenterY = myImage.ActualHeight / 2;

// Applying transform on image control
myImage.RenderTransform = transform;

// Create our BlockUIContainer
BlockUIContainer container = new BlockUIContainer();
container.Child = myImage;

// Insert container with image into the document.
FlowDocument doc = new FlowDocument();
doc.Blocks.Add(container);