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

/// 

  /// 文件生成方式
  /// 
  public class UpFileMessage
  {
    /// 

    /// 文件名
    /// 
    public string OriginalFileName { get; set; }

    /// 

    /// 是否保存略缩图
    /// 
    public bool IsImage { get; set; }

    /// 

    /// 文件流
    /// 
    public Stream FileStream { get; set; }

    /// 

    /// 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
    /// 
    public string Mode { get; set; }

    /// 

    /// 略缩图高度
    /// 
    public int? ThumbHeight { get; set; }

    /// 

    /// 略缩图宽度
    /// 
    public int? ThumbWidth { get; set; }

  }

文件上传返回结果

/// 

  /// 文件上传返回结果
  /// 
  public class UpFileResultMessage
  {
    /// 

    /// 文件保存是否成功
    /// 
    public bool IsSuccess { get; set; }

    /// 

    /// 错误消息
    /// 
    public string Message { get; set; }

    /// 

    /// 原始文件名-（无扩展名）
    /// 
    public string FileName { get; set; }

    /// 

    /// 文件名扩展名
    /// 
    public string FileSuffix { get; set; }

    /// 

    /// 文件名保存路径
    /// 
    public string FilePath { get; set; }

    /// 

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

    /// 

    /// 保存文件名（无扩展名）
    /// 
    public string SaveFileName { get; set; }

    /// 

    /// 文件自增ID
    /// 
    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
  {
    /// 

    /// 图片上传
    /// 
    /// 文件生成方式
    /// 
    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 };
      }

    }

    /// 

    /// 创建指定图片文件流的缩略图
    /// 
    /// 缩略图文件保存路径
    /// 原始文件流
    /// 缩略图宽
    /// 缩略图高
    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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