return File get error in api?

mc 3,481 Reputation points
2022-07-01T04:34:43.063+00:00

What I want is to download a excel from a api

but I get

PK Æ $Vb eO Gâ
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such code .

return File(ms.ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx");  

I am using ajax post to the api.
I can not download the file why?

ASP.NET Core
ASP.NET Core
A set of technologies in the .NET Framework for building web applications and XML web services.
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  1. JasonPan - MSFT 3,946 Reputation points Microsoft Vendor
    2022-07-01T08:26:46.877+00:00

    Hi @mc

    Please try adding responseType in the ajax request. The value of responseType can be arraybuffer, or blob. Code like:

    $.ajax({  
        url: url,  
        method: 'POST',  
        xhrFields: { responseType: 'arraybuffer'}  
    })  
    

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    Best Regards,
    Jason

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