How to get a checksum for a folder?

Question

WPF

Good afternoon! please tell me some quick example for calculating the checksum in c# for a folder. I tried to calculate the checksum for the files inside the folder, but since the files take a lot of time. Is there any quick way to find out the checksum of the entire folder at once in order to quickly compare it with the known one and, if necessary, then recalculate it for files.

Answer 1

It all depends on the degree of "uniqueness" of folders.
You can suggest the following way:
Take the names of the files, their sizes and modification dates.
Sort them by filename.
Add it to one file/line and count the hash.
This will work under certain assumptions: that you do not have an attacker who will change the contents of files without changing their size and modification date.

Answer 2

1. wpf has nothing to do with it, especially with mvvm)
2. all efforts should probably be directed to optimizing the speed of calculating the file checksum.