How to enable automatic column filling for the WPF DataGrid?

How does a WPF DataGrid automatically fill columns?

I believe everyone has encountered this problem. The DataGrid of WPF is easy to implement without setting the autosizemode attribute to fill as in the datagridview. After checking the implementation method on the Internet, the answer is yes, but the operation process is complicated. Most of them rewrite the width of each column in The sizechanged event. However, the results are not that satisfactory.

Here is a quick and sharp way: you only need to set the columnwidth attribute to *, and it is so simple.