c#代码文件上传和下载

  public JsonResult UploadFile(DriverFileManager filem)
        {
           
            var hfc = System.Web.HttpContext.Current.Request.Files;

            var filePathRoot = GetAppSetting.GetPhysicalPath + GetFileType(filem.FileType ) + "\";
            //判断是否存在目录
            if (!Directory.Exists(filePathRoot))
            {
                Directory.CreateDirectory(filePathRoot);
            }
            if (hfc.Count > 0 && !string.IsNullOrEmpty(hfc[0].FileName)) {
                var filename = hfc[0].FileName;
                var filePath = filePathRoot + Path.GetFileName(filename);

                //判断是否存在文件名
                if (System.IO.File.Exists(filePath))
                {
                    //重命名新文件
                    filename = Path.GetFileNameWithoutExtension(filename) + "_" + new Random().Next(0, 1000) + Path.GetExtension(filename);
                }
                else
                {
                    filename = Path.GetFileName(filename);
                }
                filePath = filePathRoot + filename;
                hfc[0].SaveAs(filePath);
                filem.FilePath = filename;
                filem.CreateBy = CurrentUserInfo.UserCode;
                var obj = DriverFileManager.Save(filem);
              
                  return Json(new { err = "", msg = "导入成功！" }, "text/html");
                  
            }

            return null;
        }

/////////////////////////////////////////////////////////////////////////下载//////////////////////////////////////////////////////////////////////////////////////

using Cinway.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Cinway.Controllers
{
    public class FileDownsController : Controller
    {
         //
        // GET: /FileDowns/
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <returns></returns>
        public ActionResult DowmFile(string filePath, string FileType)
        {
            string fileName=filePath;
            filePath = GetAppSetting.GetPhysicalPath + FileType + "/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }

        //
        // GET: /FileDowns/
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <returns></returns>
        public ActionResult DowmFileReceipt(string filePath, string FileType)
        {
            string fileName = filePath;
            filePath = GetAppSetting.GetPhysicalPath + "Receipt" + "/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }

        //
        // GET: /FileDowns/
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <returns></returns>
        public ActionResult ReceiptDowmFile(string filePath, string FileType)
        {
            string fileName = filePath;
            filePath = GetAppSetting.GetPhysicalPath + "Receipt/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }
        public ActionResult PreviewDowmFile(string filePath, string FileType)
        {
            string fileName = filePath;
            filePath = GetAppSetting.GetPhysicalPath + "Receipt/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            if (filePath.Contains(".pdf"))
            {
                Response.ContentType = "application/pdf";
            }
            else if(filePath.Contains(".jpg"))
            {
                Response.ContentType = "image/jpg";
            }
            else if(filePath.Contains(".png"))
            {
                Response.ContentType = "image/png";
            }
            else
            {
                Response.ContentType = "application/octet-stream";
            }


            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "inline;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            //Response.Flush();
            // Response.End();
            try { Response.Flush(); }
            catch { }
            finally
            {
                System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest();
            }
            //Response.Close();
            return new EmptyResult();
        }
        //
        // GET: /FileDowns/
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <returns></returns>
        public ActionResult DowmFile1(string filePath, string FileType)
        {
            string fileName = filePath;
            filePath = GetAppSetting.GetPhysicalPath +"TruckOrder/"+ FileType + "/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }



        //
        // GET: /FileDowns/
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <returns></returns>
        public ActionResult DowmFiles(string filePath, string FileType)
        {
            string fileName = filePath;
            int intfiletype = 0;
            if (int.TryParse(FileType, out intfiletype))
            {
                FileType = TruckFileManagerController.GetFileType(intfiletype);
            }

            filePath = GetAppSetting.GetPhysicalPath + FileType + "/" + filePath;

            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }


        #region 下载模板,关务
        public ActionResult DownModal(string fileName) {
            string filePath = Server.MapPath("~/ExcelModel/" + fileName+".xlsx");
            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName + ".xlsx") : fileName + ".xlsx"));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();
            return new EmptyResult();
        }
        #endregion
        #region 洪祺 订单上传附件下载
        public ActionResult DowmOrderFiles(string filePath, string FileType,string fileName)
        {
            int intfiletype = 0;
            if (int.TryParse(FileType, out intfiletype))
            {
                FileType = TruckFileManagerController.GetFileType(intfiletype);
            }
            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);

            fs.Close();

            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();

            Response.Expires = 0;
            Response.Buffer = true;
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";

            //解决IE中文乱码问题
            bool ie = Request.Headers.Get("User-Agent").IndexOf("MSIE") > 0 || Request.Headers.Get("User-Agent").IndexOf("Trident") > 0;

            Response.AddHeader("Content-Disposition", "attachment;filename=" + (ie ? Server.UrlEncode(fileName) : fileName));
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.AddHeader("Content-Length", bytes.Length.ToString());
            Response.BinaryWrite(bytes);

            Response.Flush();
            Response.End();

            return new EmptyResult();
        }
        #endregion
    }
}