How to return an Excel file from ASP.NET Core Web API web-app?

后端未结

关注

 4  1704

情话喂你 2020-12-31 09:47

In similar questions, with this code works to download a PDF:

I\'m testing with local files (.xlsx, .pdf, .zip) inside the Controller folder.

4条回答

旧时难觅i (楼主)

2020-12-31 10:26

I had this same issue. My issue was being caused by the client request, not the server response. I solved it by adding a response content type to my Get request's header options. Here is my example in Angular 2.

Request from client (Angular 2) **requires filesaver.js library

this._body = '';

    let rt: ResponseContentType = 2; // This is what I had to add ResponseContentType (2 = ArrayBuffer , Blob = 3)
        options.responseType = rt;
    if (url.substring(0, 4) !== 'http') {
        url = config.getApiUrl(url);
    }

    this.http.get(url, options).subscribe(
        (response: any) => {
            let mediaType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
            let blob = new Blob([response._body], { type: mediaType });
            let filename = 'test.xlsx';
            fileSaver.saveAs(blob, filename);
        });

Server side code. (.net core)

    [HttpGet("{dataViewId}")]
    public IActionResult GetData(string dataViewId)
    {
        var fileName = $"test.xlsx";
        var filepath = $"controllers/test/{fileName}";
        var mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

        byte[] fileBytes = System.IO.File.ReadAllBytes(filepath);
        return File(fileBytes, mimeType, fileName);
    }