C# PDF 预览

public ActionResult V1()
        {
            try
            {

                    string filePath = "E://123.pdf";

                    if (System.IO.File.Exists(filePath) == false)
                    {
                        return base.Content("文件不存在!");
                    }

                    Response.ContentType= "application/pdf";
                     Response.AddHeader("Accept-Ranges", "bytes");
                    Response.AddHeader("Access-Control-Expose-Headers", "Content-Disposition");
                     Response.AddHeader("Connection", "keep-alive");
                    Response.AddHeader("Content-Disposition", "inline; filename=" + id+".pdf");
                    Response.WriteFile(filePath);
                    Response.End();
                    return base.Content("");
            }
            catch (Exception e)
            {
                return base.Content(e.Message);
            }
        }

 public ActionResult V2()
        {
            try
            {

                    string filePath = "E://123.pdf";

                    if (System.IO.File.Exists(filePath) == false)
                    {
                        return base.Content("文件不存在!");
                    }
                    var memoryStream = new MemoryStream();
                    using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                    {
                        stream.CopyTo(memoryStream);
                    }
                    memoryStream.Seek(0, SeekOrigin.Begin);

                    Response.AddHeader("","");

                    return new FileStreamResult(memoryStream, "application/pdf");
            }
            catch (Exception e)
            {
                return base.Content(e.Message);
            }
        }