从asp.net web api下载文件

Question

i am trying to download a file (.docx) from asp.net web api.

Since i already have a document in the server i set the path to existing one and then i follow something sugested on stackoverflow and do this:

docDestination is my path.

   HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
    var stream = new FileStream(docDestination, FileMode.Open, FileAccess.Read);
    result.Content = new StreamContent(stream);
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.wordprocessingml.document");
    return result;

after that on my client side i try to do this:

    .then(response => {
            console.log("here lives the response:", response);
            var headers = response.headers;
            var blob = new Blob([response.body], { type: headers['application/vnd.openxmlformats-officedocument.wordprocessingml.document'] });
            var link = document.createElement('a');
            link.href = window.URL.createObjectURL(blob);
            link.download = "Filename";
            link.click();
        }

this is what i get on my response

what i get:

any help?

Answer 1

Just add ContentDisposition to your response header with value of attachment and the browser will interpret it as a file that needs to be download

HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
var stream = new FileStream(docDestination, FileMode.Open,FileAccess.Read);
result.Content = new StreamContent(stream);
result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = "document.docx"
};
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.wordprocessingml.document"); 
return result;

Take a look in this link for more information in ContentDisposition header

Answer 2

Change return type of your method. You can write method something like this.

public FileResult TestDownload()
{
    FileContentResult result = new FileContentResult(System.IO.File.ReadAllBytes("YOUR PATH TO DOC"), "application/msword")
    {
        FileDownloadName = "myFile.docx"
    };

    return result;
}

In client side, you just need to have a link button. Once you click on the button, file will be downloaded. Just write this line in cshtml file. replace controller name with your controller name.

@Html.ActionLink("Button 1", "TestDownload", "YourCOntroller")

Answer 3

When you have a stream open, you want to return it's content as a file

[HttpGet]
public async Task<FileStreamResult> Stream()
{
    var stream = new MemoryStream(System.IO.File.ReadAllBytes("physical path of file"));
    var response = File(stream, "Mime Type of file");
    return response;
}

You use it when you have a byte array you would like to return as a file

[HttpGet]
public async Task<FileContentResult> Content()
{
    var result = new FileContentResult(System.IO.File.ReadAllBytes("physical path of file"), "Mime Type of file")
    {
        FileDownloadName = "Your FileName"
    };
    return result;
}

when you have a file on disk and would like to return it's content (you give a path)-------------only in asp.net core

[HttpGet]
public async Task<IActionResult> PhysicalPath()
{
    var result = new PhysicalFileResult("physical path of file", "Mime Type of file")
    {
        FileDownloadName = "Your FileName",
        FileName = "physical path of file"
    };
    return result;
}