如何从web api控制器返回文件？

Question

我正在使用MVC 5 web Api Controller,我想返回一个文件:

[Route("")]
public HttpResponseMessage GetFile()
{
    var statusCode = HttpStatusCode.OK;
    FileStream file = XLGeneration.XLGeneration.getXLFileExigence();

    return Request.CreateResponse(statusCode, file);
}

它不起作用.

邮递员的例外是:

"ExceptionMessage":"'ObjectContent`1'类型无法序列化内容类型'application/json; charset = utf-8'的响应主体."

Answer 1

我发布了对我有用的东西,以防其他人遇到麻烦.

[ActionName("File")]
[HttpGet]
public HttpResponseMessage File()
{
        var response = new HttpResponseMessage(HttpStatusCode.OK);
        var stream = new System.IO.FileStream(yourFilePath, System.IO.FileMode.Open);
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");

        return response;
}

Answer 2

尝试这个...

[Route("")]
public HttpResponseMessage GetFile()
{
    var result = new HttpResponseMessage(HttpStatusCode.OK);
    try
    {
        var file = XLGeneration.XLGeneration.getXLFileExigence();
        result.Content = new StreamContent(file);
        result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
        var value = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
        value.FileName = "Whatever your filename is";
        result.Content.Headers.ContentDisposition = value;
    }
    catch (Exception ex)
    {
        // log your exception details here
        result = new HttpResponseMessage(HttpStatusCode.InternalServerError);
    }
    return result;
}

这实际上应该将其作为文件传输回来。