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调用方法：
UploadFile uf = new UploadFile();
/*可选参数*/
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" /*编号*/); // “/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;
</div>
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(',');