ASP.NET MVC HttpPostedFileBase文件上传的实例代码

本文介绍了asp.net mvc httppostedfilebase文件上传 ，分享给大家，希望对大家有帮助

httppostedfilebase文件上传，支持多文件一次上传，如有图片，则支持略缩图保存

文件传输信息封装

/// <summary>
  /// 文件生成方式
  /// </summary>
  public class upfilemessage
  {
    /// <summary>
    /// 文件名
    /// </summary>
    public string originalfilename { get; set; }

    /// <summary>
    /// 是否保存略缩图
    /// </summary>
    public bool isimage { get; set; }

    /// <summary>
    /// 文件流
    /// </summary>
    public stream filestream { get; set; }

    /// <summary>
    /// 生成缩略图的方式
    /// [wh]-指定宽高
    /// [h]-指定高，按比例缩放宽
    /// [w]-指定宽，按比例缩放高
    /// </summary>
    public string mode { get; set; }

    /// <summary>
    /// 略缩图高度
    /// </summary>
    public int? thumbheight { get; set; }

    /// <summary>
    /// 略缩图宽度
    /// </summary>
    public int? thumbwidth { get; set; }

  }

文件上传返回结果

/// <summary>
  /// 文件上传返回结果
  /// </summary>
  public class upfileresultmessage
  {
    /// <summary>
    /// 文件保存是否成功
    /// </summary>
    public bool issuccess { get; set; }

    /// <summary>
    /// 错误消息
    /// </summary>
    public string message { get; set; }

    /// <summary>
    /// 原始文件名-（无扩展名）
    /// </summary>
    public string filename { get; set; }

    /// <summary>
    /// 文件名扩展名
    /// </summary>
    public string filesuffix { get; set; }

    /// <summary>
    /// 文件名保存路径
    /// </summary>
    public string filepath { get; set; }

    /// <summary>
    /// 文件类型为图片时
    /// 缩略图保存路径
    /// </summary>
    public string thumbpath { get; set; }

    /// <summary>
    /// 保存文件名（无扩展名）
    /// </summary>
    public string savefilename { get; set; }

    /// <summary>
    /// 文件自增id
    /// </summary>
    public int[] fileidarray { get; set; }
  }

文件上传类库

需引用system.web命名空间，并对 [system.web.ui.page] 进行继承，调用server.mappath方法

public class fileutil : system.web.ui.page
  {
    /// <summary>
    /// 图片上传
    /// </summary>
    /// <param name="filemessage">文件生成方式</param>
    /// <returns></returns>
    public upfileresultmessage uploadfile(upfilemessage filemessage)
    {
      try
      {
        string now = datetime.today.tostring("yyyymmdd");
        string guid = guid.newguid().tostring();

        //获取文件扩展名
        var filesuffix = path.getextension(filemessage.originalfilename);

        var uploadfolder = path.combine(system.web.httpcontext.current.server.mappath(parmsconfig.upfilepathurl), now);

        if (!directory.exists(uploadfolder))
        {
          directory.createdirectory(uploadfolder);
        }

        //保存文件名
        string savefilename = guid + filesuffix;
        string filepath = path.combine(uploadfolder, savefilename);


        upfileresultmessage upfileresult = new upfileresultmessage()
        {
          issuccess = true,
          filename = path.getfilenamewithoutextension(filemessage.originalfilename),
          filesuffix = filesuffix,
          filepath = string.format(@"{0}/{1}", parmsconfig.upfileipaddressurl, now),
          savefilename = guid
        };

        using (stream sourcestream = filemessage.filestream)
        {
          using (filestream targetstream = new filestream(filepath, filemode.create, fileaccess.write, fileshare.none))
          {
            const int bufferlen = 1024 * 4;//4kb
            byte[] buffer = new byte[bufferlen];
            int count = 0;
            while ((count = sourcestream.read(buffer, 0, bufferlen)) > 0)
            {
              targetstream.write(buffer, 0, count);
            }
          }
          //上传文件为图片时,需创建缩略图
          if (filemessage.isimage)
          {
            var uploadthumbfolder = path.combine(uploadfolder, "thumb");

            if (!directory.exists(uploadthumbfolder))
            {
              directory.createdirectory(uploadthumbfolder);
            }
            using (filestream targetstream = new filestream(filepath, filemode.open, fileaccess.read, fileshare.none))
            {
              system.drawing.image image = system.drawing.image.fromstream(targetstream);
              int width = image.width;
              int height = image.height;
              int thumbwidth = 0;
              int thumbheight = 0;
              switch (filemessage.mode)
              {
                case "wh": //指定高宽缩放（可能变形） 
                  thumbwidth = filemessage.thumbwidth.hasvalue ? filemessage.thumbwidth.value : 200;
                  thumbheight = filemessage.thumbheight.hasvalue ? filemessage.thumbheight.value : 200;
                  break;
                case "w":  //指定宽，高按比例   
                  thumbwidth = filemessage.thumbwidth.hasvalue ? filemessage.thumbwidth.value : 200;
                  thumbheight = height * thumbwidth / width;
                  break;
                case "h":  //指定高，宽按比例
                  thumbheight = filemessage.thumbheight.hasvalue ? filemessage.thumbheight.value : 200;
                  thumbwidth = width * thumbheight / height;
                  break;
                default:
                  thumbwidth = filemessage.thumbwidth.hasvalue ? filemessage.thumbwidth.value : 200;
                  thumbheight = height * thumbwidth / width;
                  break;
              }
              string thumbfilepath = path.combine(uploadthumbfolder, savefilename);
              createthumbnail(thumbfilepath, targetstream, thumbwidth, thumbheight);
              upfileresult.thumbpath = string.format(@"{0}/{1}/thumb", parmsconfig.upfileipaddressurl, now);
            }
          }
        }

        return upfileresult;
      }
      catch (exception ex)
      {
        return new upfileresultmessage() { issuccess = false, message = ex.message };
      }

    }

    /// <summary>
    /// 创建指定图片文件流的缩略图
    /// </summary>
    /// <param name="thumbfilepath">缩略图文件保存路径</param>
    /// <param name="filestream">原始文件流</param>
    /// <param name="width">缩略图宽</param>
    /// <param name="height">缩略图高</param>
    private void createthumbnail(string thumbfilepath, stream filestream, int width, int height)
    {
      using (image image = image.fromstream(filestream))
      {
        using (image thumbnail = image.getthumbnailimage(width, height, null, intptr.zero))
        {
          thumbnail.save(thumbfilepath);
        }
      }

    }

  }

调用方式

var upfilemsg = new upfilemessage()
          {
            isimage = true,
            originalfilename = platformimg[i].filename,
            filestream = platformimg[i].inputstream,
            thumbwidth = thumbwidth,
            mode = "w"
          };
         var  upfileresultmsg = new fileutil().uploadfile(upfilemsg);

代码地址：文件上传类库包.zip 

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