问题
Hi i have loaded a bitmap and i need to set my own height and width ,
bitmap.height = 100;
but this statement doesn't allow me because it says that
'System.Drawing.Image.Width' cannot be assigned to -- it is read only
whats the method to re-size the bitmap? or assign these parameters ?
回答1:
The parameters are read-only because a bitmap is a fixed size. Changing the size of the bitmap structure wouldn't do anything to affect the image. What you need is to scale the image, rather than just assign a width/height property.
There isn't a built-in method I'm aware of that will do this for you, so you'll need to go through some extra work. This tutorial may help you out.
回答2:
The other question will indeed help you by giving you some code. But you may want an explanation.
You can't assign to the dimensions because it wouldn't make any sense - once the image data is loaded, changing the size would require rearranging the data, inserting or removing sections of pixel data. A simple size assignment wouldn't have enough information to do this properly for you.
The proper way to change the size of an image is to create a new one, and then draw the old image onto it. For that, see the other questions that have been referenced.
回答3:
This may help you Resizing an image in asp.net
来源：https://stackoverflow.com/questions/5987249/how-to-set-bitmap-width-and-bitmap-height