Barefoot learning LINQ (020): adding, deleting, querying, and modifying operation data (C #)

Http://u.115.com/file/f2596c101f demo

Summary

If you want to find the data, how can we summarize it? Summarize it by yourself.

If you want to add data, first create the relevant entity class and then call the insertonsubmit () method.

If you want to update the data, first obtain the Object Class Object of the data and then modify it. There are no special methods to call.

If you want to delete data, first obtain the data entity class object to be deleted, and then call the deleteonsubmit () method.

Most importantly, do not forget to call the submitchanges () of the data context, whether it is to add, modify, or delete data. Otherwise, you are ready to give up your work!