问题
One of the params which can be used when saving a bitmapis Encoder.ScanMethod.
It is documented here at least in theory:
https://docs.microsoft.com/en-us/dotnet/api/system.drawing.imaging.encoder.scanmethod
But the page says nothing at all about what it actually does.
The docs just talk about EncoderParameters in general (and is the same boilerplate text as for other parameters, some of which are also poorly documented).
来源：https://stackoverflow.com/questions/55384173/what-does-encoder-scanmethod-do