asp.net圖片上傳(帶重新命名)

 點擊按鈕上傳FileUpload的圖片

 

   protected void Button3_Click(object sender, ImageClickEventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            //重新命名圖片
            string strFileName1 = FileUpload1.FileName;            //取到上傳檔案的名稱
            string[] myfile = strFileName1.Split('.');               //把檔案名稱與檔案類型分開
            string dotname = myfile[myfile.Length - 1].ToString().ToLower();             //得到檔案類型
            if (dotname == "gif" || dotname == "jpg")
            {
                string filepath = Path.GetFullPath(FileUpload1.PostedFile.FileName);
                Random myrdn = new Random();                    //產生隨機數
                strFileName1 = DateTime.Now.ToString("yyMMddHHmm") + myrdn.Next(10000).ToString() + "." + dotname;
                string imgpath = Server.MapPath("UserImg/");
                string folder = "bb";                     //建立的檔案夾名稱
                if (!System.IO.Directory.Exists(imgpath + folder))
                {

                    //自動組建檔案夾
                    System.IO.Directory.CreateDirectory(imgpath + folder);
                }
                FileUpload1.SaveAs(imgpath + folder + "//" + strFileName1);
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('上傳完畢');</script>");
            }
            else
            {
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('圖片類型不對！')</script>");
            }
        }
    }