Visual studio import

To import data documents, we first need to create Excel Table and document table name and format , The format cannot accommodate any errors
On the view page, we need to open the modal box 、 Then download the template and find the path of the prepared document 、
Upload files 、 obtain 、 establish 、 open 、 Send a request

When we go to the controller, we also read the file path first to see whether we find the module

Then we will deal with the data files later
Get file suffix （ Convert the file into a binary array 、 File write binary array 、 Convert binary array into memory stream 、 Convert memory stream to workbooks 、 workbook =》DataTable=》 Table object =》 Add save ）

obtain Excel Data rows in the table （ Get data row 、 establish DataTable,NewRow： Create a new table with the same schema as this table 、 Whether the record is empty ）