attachmentbussiness.cs

ASP.NET 2.0动态网站设计实例源代码,本书介绍了ASP.NET2.0的基础知识

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;

/// <summary>
/// 关于附件的业务层操作
/// </summary>
public class AttachmentBussiness
{
 BBSTableTableAdapters.ArticleTableAdapter artTable;
 string PhysicalPath;
 public AttachmentBussiness()
 {
  artTable = new BBSTableTableAdapters.ArticleTableAdapter();
 }
 /// <summary>
 /// 上传附件，并返回添加的ID
 /// </summary>
 /// <param name="att">附件实体</param>
 /// <returns>添加是否成功</returns>
 public bool AddAttachment(ref AttachmentEntity att,FileUpload fileUpload)
 {
  //上传文件
  string attPath=att.PhysicalPath + @"\Attachment";
  if (Common.CreateDirectory(attPath))
  {
   attPath += @"\" + DateTime.Now.Year.ToString();
   att.AttachmentURL =@"/" +DateTime.Now.Year.ToString();
   if (Common.CreateDirectory(attPath))
   {
    attPath += @"\" + DateTime.Now.Month.ToString();
    att.AttachmentURL += @"/"+DateTime.Now.Month.ToString();
    if (Common.CreateDirectory(attPath))
    {
     attPath += @"\" + DateTime.Now.Day.ToString();
     att.AttachmentURL += @"/"+DateTime.Now.Day.ToString();
     if (Common.CreateDirectory(attPath))//若创建目录成功
     {
      //上传文件
      string fileName = Common.GenerateFileName();
      string fileType=System.IO.Path.GetExtension(fileUpload.PostedFile.FileName);
      att.AttachmentURL += @"/"+fileName+fileType;
      attPath += @"\"+fileName + fileType;
      fileUpload.SaveAs(attPath);
     }
     else//若创建不成功
      return false;
    }
    else//若创建不成功
     return false;
   }
   else//若创建不成功
    return false;
  }
  else//若创建不成功
   return false;

  object attID = artTable.AddAttachment(att.AttachmentURL);
  if (attID != null)
   att.AttachmentID = Convert.ToInt32(attID);
  return true;
 }
 /// <summary>
 /// 根据ID删除附件纪录和附件文件
 /// </summary>
 /// <param name="att">附件实体</param>
 public bool DeleteAttachmentByID(AttachmentEntity att)
 {
  //若该附件信息存在
  if (GetAttachmentByID(ref att))
  {
   string fileName = att.PhysicalPath + @"\attachment"+att.AttachmentURL.Replace(@"/", @"\");
   if (Common.DeleteFile(fileName))
    return true;
   else
    return false;
  }
  else//否则
  {
   return false;
  }
 }
 /// <summary>
 /// 根据ID获取附件URL
 /// </summary>
 /// <param name="att">附件实体</param>
 public bool GetAttachmentByID(ref AttachmentEntity att)
 {
  DataTable attURL = artTable.GetAttachmentByID(att.AttachmentID);
  //若没有符合条件的纪录
  if (attURL == null)
   return false;
  else//否则
  {
   att.AttachmentURL = attURL.Rows[0][0].ToString();
   return true;
  }
 }
}