如何从内存中而不是文件系统中的另一个BitmapImage调整BitmapImage的大小

Question

This is the continuation of

Datacontract serialization/serialization with images

so now I have a BitmapImage coming from a stream. In short a BitmapImage I want to resize it to a desired size.

I have found tons of code on how to resize from an image on file system but none on how to resize from an already existing BitmapImage

EDIT:

Answer 1

You may use a TransformedBitmap with an appropriate ScaleTransform :

BitmapImage sourceBitmap = ...
var targetBitmap = new TransformedBitmap(sourceBitmap, new ScaleTransform(0.5, 0.5));

The result is a TransformedBitmap, not a BitmapImage. However, this shouldn't matter, because in your application there should be no need to deal only with BitmapImages. It should be sufficient to do all image-related stuff with the base classes BitmapSource or even ImageSource . Eg the Source property of the Image control is of type ImageSource .