如何使用MVVM处理数据网格单元更改？

I'm trying to figure out how to handle changes in a data grid cell while keeping within the MVVM design pattern. When the user changes the value in a cell, I have to go off and change a bunch of files based on the new cell value. I know how I could easily do this with code behind, but is there a cleaner, more MVVM-esque way to do this with command bindings?I'm trying to figure out how to handle changes