C# Question

Returning a file content from Web Api using HTTP GET request

A client will be issuing a GET request to our web api service, and we need to respond to that request with the specified file.

The file content will be as byte array like:

byte[] fileContent = Convert.FromBase64String(retrievedAnnotation.DocumentBody);

How do I respond to GET request with the above file content as a file?

I've stubbed out a controller:

[Route("Note({noteGuid:guid})/attachment", Name = "GetAttachment")]
public async Task<object> GetAttachment(Guid noteGuid)

return new object();

Instead of the new object, how do I return the fileContent to the GET request?

Answer Source

You can return file content from web api using below method

public HttpResponseMessage GetAttachment(Guid noteGuid)
    byte[] content = Convert.FromBase64String(retrievedAnnotation.DocumentBody);
    HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
    response.Content = new ByteArrayContent(content);
    response.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
    response.Content.Headers.ContentDisposition.FileName = "fileName.txt";
    response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain");

    return response;
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