HttpPostedFileBase文件上传实例详解

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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);

总结

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