1.控制器的ActionResult

  public ActionResult DownLoadFile()

        {

            string filePath = Server.MapPath("~/ResourceFile/1ef53469-cbac-4007-b40b-ae68644794e7.doc");

            return new DownloadResult(filePath, "1ef53469-cbac-4007-b40b-ae68644794e7.doc");        

        }

2.DownLoadResult类的实现

 public class DownloadResult : ActionResult

    {

        public DownloadResult()

        {

        }

        public DownloadResult(string virtualPath,string fileDownloadName)

        {

            this.VirtualPath = virtualPath;

            this.FileDownloadName = fileDownloadName;

        }

        public string VirtualPath

        {

            get;

            set;

        }

        public string FileDownloadName

        {

            get;

            set;

        }

        public override void ExecuteResult(ControllerContext context) {

              if (!String.IsNullOrEmpty(FileDownloadName)) {

                  context.HttpContext.Response.AddHeader("content-disposition",

                    "attachment; filename=" + this.FileDownloadName);

    }

    string filePath = this.VirtualPath;

    context.HttpContext.Response.TransmitFile(filePath);

    }

    }