Create a FrameworkElement out of an BitmapImage file, and then destroy? - wpf

Question

I have a WPF project, which we using some WindowsForm control(PivotTable from OWC, Office Web Component). However, since the PivotTable doesn't support print very well, the only way we can think of is to print the image file PivotTable exports(another way is to print from exported Excel file, but we want to avoid it since it is not guaranteed that Excel is installed on the machine).
We already have one print project, which will print WPF ElementFramework nicely. So I want to use that piece of code. Now my question is: how I can generate a FrameworkElement out of a BitmapImage from code. Since this FrameworkElement is purely for printing, so I guess I must create it from the code, probably assign a parent to it, not show it on the screen, and after the printing destroy the FrameworkElement so that ultimately I can delete the temp BitmapImage file.
So this is beyond my knowledge. I don't even know whether that's a proper way: create a UI element for some non-UI related work? Any advice on that? Thanks!

Answer 1

You should load the temp image file's bytes into memory and create a Image from those bytes.
Your Image will not use the temp file directly and you can delete it immediately after reading the bytes, the rest is GarbageCollector's job. Here is a function to create your BitmapImage from bytes:
public static BitmapImage GetImageFromByteArray(byte[] rawImageBytes)
{
BitmapImage imageSource = null;
try
{
using (MemoryStream stream = new MemoryStream(rawImageBytes))
{
stream.Seek(0, SeekOrigin.Begin);
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.StreamSource = stream;
bi.EndInit();
imageSource = bi;
}
}
catch (System.Exception)
{
}
return imageSource;
}
And use it like this:
testImage.Source = GetImageFromByteArray(rawImageBytes);