在Angular中导入excel文件并将数据传入ASP.NET Core API项目

Question

So the situation is the following. I have an Angular front end project and I want to import an excel file from the front end together with some additional properties.

The front end I will handle, but I have a couple of questions for the back end:

1. What should I be receiving as a variable type in the back end for the excel file?
2. I want to foreach the data from the excel file and get only specific data. For example, I have one sheet only with rows Name, Age and Number of transactions. I want to take only the name and number of transactions and save that information in a new instance of a class I have within my application.

How do I do that?

Answer 1

required before you start the OPEN XML SDK

First in asp you need to defined your method with a IFormFile variable or use the FileUpload Helper class

then you need to move the data into a stream eg IFormFile.CopyToAsync(Stream)

finally open the spreadsheet for read only access so you can read the data

this would look something like this

public async Task<IActionResult> OnPostUploadAsync(List<IFormFile> files)
{
    foreach(var file in files)
    {
        using var mem = new MemoryStream();
        await file .CopyToAsync(mem);
        var doc = SpreadsheetDocument Open(mem, false);
        ...

this will open the file and parse the data in it as an excel spreadsheet

you can then use the spreadsheet methods to extract the data you require from inside the document