asp.net 文件上传类

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; /// <summary> /// Summary description for UploadFile /// </summary> public class UploadFile {     private string[] AllowFileType; //所允许的文件类型     private double FileLength; //所允许的文件大小(KB)     private string SavePath; //文件的存储路径     private string SaveFile; //上传后的文件名     private string Error; //存储错误信息     private string FileExtesion; //上传文件的扩展名     /// <summary>     /// 构造函数     /// </summary>     /// <param name="allFileType">允许的文件类型，多个以","分开</param>     /// <param name="fileLength">文件大小</param>     /// <param name="savePath">保存路径</param>     public UploadFile(string allFileType, double fileLength, string savePath)     {         char[] sp = { ',' };         AllowFileType = allFileType.Split(sp);         FileLength = fileLength * 1024;         SavePath = savePath;     }     /// <summary>     /// 返回生成的文件名     /// </summary>     public string FileName     {         get         {             return SaveFile;         }     }     /// <summary>     /// 返回出错信息     /// </summary>     public string ErrorMessage     {         get         {             return Error;         }     }     /// <summary>     /// 根据SavePath,生成文件名     /// </summary>     /// <returns></returns>     private string MakeFileName(string fileType,string fileName)     {         string file = this.SavePath + "\\" + DateTime.Now.ToString("yyMMddhhmmss") + fileName;         while (File.Exists(file))         {             file = this.SavePath + "\\" + DateTime.Now.ToString("yyMMddhhmmss") + fileName;         }         return file;     }     /// <summary>     /// 检查文件类型     /// </summary>     /// <param name="fileEx">MIME内容</param>     /// <returns></returns>     private bool CheckFileExt(string fileEx)     {         bool result = false;         for (int i = 0; i < this.AllowFileType.Length; i++)         {             if (fileEx.IndexOf(this.AllowFileType[i].ToLower()) > -1)             {                 result = true;                 break;             }         }         return result;     }     public bool UpLoad(System.Web.UI.WebControls.FileUpload file)     {         bool result = true;         try         {             //查看文件长度             if (file.PostedFile.ContentLength > (this.FileLength))             {                 this.Error = "文件大小超出范允许的范围！";                 return false;             }             string fileName = Path.GetFileName(file.PostedFile.FileName);             this.FileExtesion = Path.GetExtension(fileName);             if (!CheckFileExt(this.FileExtesion.ToLower()))             {                 this.Error = "文件类型" + this.FileExtesion + "不允许！";                 return false;             }             //取得要保存的文件名             string UpFile = this.MakeFileName(this.FileExtesion, fileName);             //保存文件             file.PostedFile.SaveAs(UpFile);             //返回文件名             this.SaveFile = Path.GetFileName(UpFile);         }         catch (Exception e)         {             result = false;             this.Error = e.Message;         }         return result;     } }