上傳檔案[原創]

/*
 Descript:上傳檔案
 Author:Blue.Dream
 Date:2004-09-21 22:21 
聲明:最近發現不少網站引用本人的文章，竟將作者資訊都省略了，請引用本文的網站將作者不要省略作者的資訊.
*/
namespace BDStudio.Common
{
 using System;
 using System.IO;
 using System.Web;
 /// <summary>
 /// 上傳單個檔案
 /// </summary>
 public class UpLoadFile
 {
  private string[] AllowFileType;    //所允許的檔案類型
  private double FileLength;     //所允許的檔案大小(KB)
  private string SavePath;     //檔案的儲存路徑
  private string SaveFile;     //上傳後的檔案名稱
  private string Error;      //儲存錯誤資訊
  private string FileExtesion;    //上傳檔案的副檔名

  /// <summary>
  /// 建構函式
  /// </summary>
  /// <param name="allFileType">允許的檔案類型，多個以","分開</param>
  /// <param name="fileLength">檔案大小</param>
  /// <param name="savePath">儲存路徑</param>
  public UpLoadFile(string allFileType,double fileLength,string savePath)
  {
   char[] sp = {','};
   AllowFileType = allFileType.Split(sp);
   FileLength = fileLength;
   SavePath = savePath;
  }

  /// <summary>
  /// 返回產生的檔案名稱
  /// </summary>
  public string FileName
  {
   get
   {
    return SaveFile;
   }
  }

  /// <summary>
  /// 返回出錯資訊
  /// </summary>
  public string ErrorMessage
  {
   get
   {
    return Error;
   }
  }

  /// <summary>
  /// 根據SavePath,組建檔案名
  /// </summary>
  /// <returns></returns>
  private string MakeFileName(string fileType)
  {   
   string file = this.SavePath + "//" + System.DateTime.Now.Year.ToString()+System.DateTime.Now.Month.ToString()+System.DateTime.Now.Day.ToString()+System.DateTime.Now.Hour.ToString()+System.DateTime.Now.Minute.ToString()+System.DateTime.Now.Second.ToString()+this.FileExtesion;
   for(; File.Exists(file);)
   {
    file = this.SavePath + "//" + System.DateTime.Now.Year.ToString()+System.DateTime.Now.Month.ToString()+System.DateTime.Now.Day.ToString()+System.DateTime.Now.Hour.ToString()+System.DateTime.Now.Minute.ToString()+System.DateTime.Now.Second.ToString()+this.FileExtesion;
   }
   return file;
  }

  /// <summary>
  /// 檢查檔案類型
  /// </summary>
  /// <param name="fileEx">MIME內容</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()
  {
   bool result = true;
   System.Web.HttpFileCollection objFiles = System.Web.HttpContext.Current.Request.Files;
   System.Web.HttpPostedFile objFile = objFiles[0];
   try
   {
    //查看檔案長度
    if(objFile.ContentLength > (this.FileLength))
    {
     this.Error = "檔案大小超出範允許的範圍！";
     return false;
    }    
    
    string fileName = Path.GetFileName(objFile.FileName);
    this.FileExtesion = Path.GetExtension(fileName);    
    
    if(!CheckFileExt(this.FileExtesion.ToLower()))
    {
     this.Error = "檔案類型"+this.FileExtesion+"不允許！";
     return false;
    }
    //取得要儲存的檔案名稱
    string UpFile = this.MakeFileName(this.FileExtesion);
    //儲存檔案
    objFile.SaveAs(UpFile);
    //返迴文件名
    this.SaveFile = Path.GetFileName(UpFile);
    
   }
   catch(Exception e)
   {
    result = false;
    this.Error = e.Message;
   } 
   return result;
  }
 }
}
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