从 webapp 下载 zip 文件

Question

The user of my webapp should be able to download a zip-file with more than 10MB. I have the following code in my controller:

[HttpPost]
public IActionResult Download(){
    Response.Clear();
    esponse.Headers.Add("Content-disposition", "attachment; filename=" + filename +".zip");
    Response.ContentType = "application/zip";
    Response.SendFileAsync(pathOfTheFile);
    Response.Body.FlushAsync();

    return Content("Download successfull");
}

It starts downloading the file but the download stops an it says network error. When I say continue in the download-bar, it says that there is no file.

What is my problem?

Answer 1

The error occurs because response with headers and content is written twice. First time it's written by your code including Response.Body.FlushAsync and second time it's written by ASP.NET framework when result returned by action is executed ( IActionResult.ExecuteResultAsync ).

Consider using File method provided by Controller

[HttpPost]
public IActionResult Download()
{
    byte[] content = System.IO.File.ReadAllBytes(pathOfTheFile);

    return File(content, "application/zip", filename);
}