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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