MVC 5如何强制浏览器打开PDF文件

Question

I spend the whole day trying to force a browser to open PDF files instead of download it using System.Web.Mvc.FileResult and in the and I did it in old fashion way System.Web.Response like this:

Contoller

 //StaticData.ReportsTemp  it's my  type of Dictionary<string,object>
public async Task<ActionResult> GenerateReport() {
    //some code 
    var tempGuid = Guid.NewGuid().ToString();
    StaticData.ReportsTemp[tempGuid] = File(strem, obj.MediaType, obj.name);
    return Content(opertionGuid);
}

public FileResult DownloadReport(string fileName) {
    FileResult result = null;
    FileStreamResult st = null;
    if (StaticData.ReportsTemp.ContainsKey(fileName)) {
        st = StaticData.ReportsTemp[fileName] as FileStreamResult;
        result = st;
        StaticData.ReportsTemp.Remove(fileName);
        if (st.ContentType == System.Net.Mime.MediaTypeNames.Application.Pdf || 1 == 1) { //Old fashion way
            byte[] buff = null;
            System.IO.BinaryReader br = new System.IO.BinaryReader(st.FileStream);
            buff = br.ReadBytes((int) st.FileStream.Length);
            Response.BinaryWrite(buff);
            Response.AddHeader("content-length", buff.Length.ToString());
            Response.ContentType = st.ContentType;
            Response.AddHeader("Content-Disposition", "inline; filename=" + st.FileDownloadName + ";");
            return null;
        }
    }
    return result;
}

JS

function onSuccess(data, status, xhr) {
    window.open("@Url.RouteUrl(new { Controller = "Main", Action = "DownloadReport" })?filename=" + xhr.responseText,'_brank');
}

My downloading process is divided on two steps:

1. 1) I'm generation report , create FileStremResult ,saving into StaticData.Reports dictionary and return dictionary key to client
2. 2) using dictionary key recived from step 1 I'm calling action Download which return FileStremResult from StaticData.Reports dictionary

PDF are opened in browser and all other files still are simply just downloading.

But I'm still wondering if there is any other way to achieve this? Is there any way to do this with System.Web.Mvc ActionResult's classes ?

Answer 1

I do not know how StaticData class work. Normally, you could return FileResult , and if file is not valid or doesn't exist, you could display PageNotFound page.

Note: if client doesn't have Acrobat installed, you cannot force them to view inside browser.

public class ReportFile
{
    public byte[] Data { get; set; }
    public string FileName { get; set; }
    public string ContentType { get; set; }
}

public async Task<ActionResult> GenerateReport()
{
    //some code 
    var tempGuid = Guid.NewGuid().ToString();
    StaticData.ReportsTemp[tempGuid] = new ReportFile
    {
        Data = data, // Convert stream to byte array
        ContentType = obj.MediaType,
        FileName = obj.name
    };
    return Content(tempGuid);
}

public ActionResult DownloadReport(string fileName)
{
    if (StaticData.ReportsTemp.ContainsKey(fileName))
    {
        ReportFile file = StaticData.ReportsTemp[fileName];
        StaticData.ReportsTemp.Remove(fileName);

        if (file.ContentType == MediaTypeNames.Application.Pdf)
        {
            var cd = new ContentDisposition { FileName = file.FileName, Inline = true };
            Response.AppendHeader("Content-Disposition", cd.ToString());
            return File(file.Data, file.ContentType);
        }
    }
    return View("PageNotFound");
}