CODEWITHSUNDEEP
c#asp.net-core-3.1
Mads
Mads

Reputation: 465

Response.Body.WriteAsync: The file could not be opened

I fetch a file from external source, that returns the file in byte array. Now I want to open the file in the browser.

This is what I do:

public async Task OpenFile()
{

    [...]
    byte[] pdf = externalResource.GetPdf();
    Response.Headers.Add("Content-Disposition", "inline;filename=MyFile.pdf");
    await Response.Body.WriteAsync(pdf, 0, pdf.Length);
    Response.Body.Seek(0, SeekOrigin.Begin);
    //await Response.Body.FlushAsync();
    return;
}

The first time I call OpenFile, the PDF-file is shown. But if I call OpenFile again or refresh the window, I get an "The PDF-file could not be opened" from the browser (freely translated from danish).

What am I missing? - and is there another (better) approach?

Thanks!

Upvotes: 0

Views: 1333

Answers (1)

slhklc
slhklc

Reputation: 83

I think you don't need to write Response.Body.Seek section cause after you write any buffer data to response body, actual response is ready for your browser.

                    byte[] pdf = File.ReadAllBytes("C:/Users/skilic/Desktop/1.pdf");
                
                context.Response.Headers.Add("Content-Disposition", "inline;filename=MyFile.pdf");
                
                await context.Response.Body.WriteAsync(pdf, 0, pdf.Length);
                
                //context.Response.Body.Seek(0, SeekOrigin.Begin);

I test it with just basic dotnet core web app. enter image description here

Upvotes: 1

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