调用方法：

UploadFile uf = new UploadFile(); uf.SetIsUseOldFileName(true);//是否使用原始文件名作为新文件的文件名(默认:true),true原始文件名,false系统生成新文件名uf.SetFileDirectory(Server.MapPath("/file/temp3/"));//文件保存路径(默认:/upload)uf.SetFileType("*");//允许上传的文件类型, 逗号分割,必须全部小写! *表示所有 (默认值: .pdf,.xls,.xlsx,.doc,.docx,.txt,.png,.jpg,.gif ) uf.SetIsRenameSameFile(false);//重命名同名文件？ //文件以时间分目录保存var message = uf.Save(Request.Files["Fileupload1"]); // “/file/temp3/2015/4/xx.jpg” //文件以编号分目录保存var message2 = uf.Save(Request.Files["Fileupload1"], "001" ); // “/file/temp3/001/xx.jpg” //返回信息var isError = message.Error;//判段是否上传成功var webPath = message.WebFilePath;//返回web路径var msg = message.Message;//返回上传信息var filePath = message.FilePath;//反回文件路径var isSuccess = message.Error == false;

代码：

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text.RegularExpressions;using System.Web;using System.Web.Hosting; namespace SyntacticSugar{ /// <summary> /// ** 描述：单文件上传类 (暂时不支持多文件上传) /// ** 创始时间：2015-5-27 /// ** 修改时间：- /// ** 作者：sunkaixuan /// </summary> public class UploadFile { private ParamsModel Params; public UploadFile() { Params = new ParamsModel() { FileDirectory = "/upload", FileType = ".pdf,.xls,.xlsx,.doc,.docx,.txt,.png,.jpg,.gif", MaxSizeM = 10, PathSaveType = PathSaveType.dateTimeNow, IsRenameSameFile=true }; } /// <summary> /// 文件保存路径(默认:/upload) /// </summary> public void SetFileDirectory(string fileDirectory) { if (fileDirectory == null) { throw new ArgumentNullException("fileDirectory"); } var isMapPath = Regex.IsMatch(fileDirectory, @"[a-z]\:\\", RegexOptions.IgnoreCase); if (isMapPath) { fileDirectory = GetRelativePath(fileDirectory); } Params.FileDirectory = fileDirectory; } /// <summary> /// 是否使用原始文件名作为新文件的文件名(默认:true) /// </summary> /// <param name="isUseOldFileName">true原始文件名,false系统生成新文件名</param> public void SetIsUseOldFileName(bool isUseOldFileName) { Params.IsUseOldFileName = isUseOldFileName; } /// <summary> /// 允许上传的文件类型, 逗号分割,必须全部小写! *表示所有 (默认值: .pdf,.xls,.xlsx,.doc,.docx,.txt,.png,.jpg,.gif ) /// </summary> public void SetFileType(string fileType) { Params.FileType = fileType; } /// <summary> /// 允许上传多少大小(单位：M) /// </summary> public void SetMaxSizeM(double maxSizeM) { Params.MaxSizeM = maxSizeM; } /// <summary> /// 重命名同名文件？ /// </summary> /// <param name="isRenameSameFile">true:重命名,false覆盖</param> public void SetIsRenameSameFile(bool isRenameSameFile) { Params.IsRenameSameFile = isRenameSameFile; } /// <summary> /// 保存表单文件 /// </summary> /// <param name="postFile">HttpPostedFile</param> /// <returns></returns> public ResponseMessage Save(HttpPostedFile postFile) { return CommonSave(postFile); } /// <summary> /// 保存表单文件,根据编号创建子文件夹 /// </summary> /// <param name="postFile">HttpPostedFile</param> /// <param name="number">编号</param> /// <returns></returns> public ResponseMessage Save(HttpPostedFile postFile, string number) { Params.PathSaveType = PathSaveType.code; _Number = number; return CommonSave(postFile); } /// <summary> /// 保存表单文件,根据HttpPostedFile /// </summary> /// <param name="postFile">HttpPostedFile</param> /// <param name="isRenameSameFile">值为true 同名文件进行重命名，false覆盖原有文件</param> /// <param name="fileName">新的文件名</param> /// <returns></returns> private ResponseMessage CommonSave(HttpPostedFile postFile) { ResponseMessage reval = new ResponseMessage(); try { if (postFile == null || postFile.ContentLength == 0) { TryError(reval, "没有文件！"); return reval; } //文件名 string fileName = Params.IsUseOldFileName ? postFile.FileName : DateTime.Now.ToString("yyyyMMddhhmmssms") + Path.GetExtension(postFile.FileName); //验证格式 this.CheckingType(reval, postFile.FileName); //验证大小 this.CheckSize(reval, postFile); if (reval.Error) return reval; string webDir = string.Empty; // 获取存储目录 var directory = this.GetDirectory(ref webDir); var filePath = directory + fileName; if (System.IO.File.Exists(filePath)) { if (Params.IsRenameSameFile) { filePath = directory + DateTime.Now.ToString("yyyyMMddhhssms") + "-" + fileName; } else { System.IO.File.Delete(filePath); } } // 保存文件 postFile.SaveAs(filePath); reval.FilePath = filePath; reval.FilePath = webDir + fileName; reval.FileName = fileName; reval.WebFilePath = webDir + fileName; return reval; } catch (Exception ex) { TryError(reval, ex.Message); return reval; } } private void CheckSize(ResponseMessage message, HttpPostedFile PostFile) { if (PostFile.ContentLength / 1024.0 / 1024.0 > Params.MaxSizeM) { TryError(message, string.Format("对不起上传文件过大，不能超过{0}M！", Params.MaxSizeM)); } } /// <summary> /// 根据物理路径获取相对路径 /// </summary> /// <param name="fileDirectory"></param> /// <param name="sever"></param> /// <returns></returns> private static string GetRelativePath(string fileDirectory) { var sever = HttpContext.Current.Server; fileDirectory = "/" + fileDirectory.Replace(sever.MapPath("~/"), "").TrimStart('/').Replace('\\', '/'); return fileDirectory; } /// <summary> /// 获取目录 /// </summary> /// <returns></returns> private string GetDirectory(ref string webDir) { var sever = HttpContext.Current.Server; // 存储目录 string directory = Params.FileDirectory; // 目录格式 string childDirectory = DateTime.Now.ToString("yyyy-MM/dd"); if (Params.PathSaveType == PathSaveType.code) { childDirectory = _Number; } webDir = directory.TrimEnd('/') + "/" + childDirectory + '/'; string dir = sever.MapPath(webDir); // 创建目录 if (Directory.Exists(dir) == false) Directory.CreateDirectory(dir); return dir; } /// <summary> /// 验证文件类型) /// </summary> /// <param name="fileName"></param> private void CheckingType(ResponseMessage message, string fileName) { if (Params.FileType != "*") { // 获取允许允许上传类型列表 string[] typeList = Params.FileType.Split(','); // 获取上传文件类型(小写) string type = Path.GetExtension(fileName).ToLowerInvariant(); ; // 验证类型 if (typeList.Contains(type) == false) this.TryError(message, "文件类型非法!"); } } /// <summary> /// 抛出错误 /// </summary> /// <param name="Msg"></param> private void TryError(ResponseMessage message, string msg) { message.Error = true; message.Message = msg; } #region models private class ParamsModel { /// <summary> /// 文件保存路径 /// </summary> public string FileDirectory { get; set; } /// <summary> /// 允许上传的文件类型, 逗号分割,必须全部小写! /// </summary> public string FileType { get; set; } /// <summary> /// 允许上传多少大小 /// </summary> public double MaxSizeM { get; set; } /// <summary> /// 路径存储类型 /// </summary> public PathSaveType PathSaveType { get; set; } /// <summary> /// 重命名同名文件? /// </summary> public bool IsRenameSameFile { get; set; } /// <summary> /// 是否使用原始文件名 /// </summary> public bool IsUseOldFileName { get; set; } } /// <summary> /// 路径存储类型 /// </summary> public enum PathSaveType { /// <summary> /// 根据时间创建存储目录 /// </summary> dateTimeNow = 0, /// <summary> /// 根据ID编号方式来创建存储目录 /// </summary> code = 1 } private string _Number { get; set; } /// <summary> /// 反回信息 /// </summary> public class ResponseMessage { /// <summary> /// 上传错误 /// </summary> public bool Error { get; set; } /// <summary> /// 消息 /// </summary> public string Message { get; set; } /// <summary> /// 文件路径 /// </summary> public string FilePath { get; set; } /// <summary> /// 网站路径 /// </summary> public string WebFilePath { get; set; } /// <summary> /// 获取文件名 /// </summary> public string FileName { get; set; } } #endregion }}