站长论坛

标题: ASP.NET上传图片的简单方法 [打印本页]

作者: abcdef133 时间: 2007-9-19 23:48
标题: ASP.NET上传图片的简单方法
private void Button1_Click(object sender, System.EventArgs e)
   {
         string filename = "";
         if (File1.PostedFile.ContentLength != 0)
         {
            string fn = File1.PostedFile.FileName;
            filename =getRandomFilename();
            filename += fn.Substring(fn.LastIndexOf("."));
            if((fn.Substring(fn.LastIndexOf(".")+1).ToLower()=="jpg")||(fn.Substring(fn.LastIndexOf(".")+1).ToLower()=="gif"))
            {
               File1.PostedFile.SaveAs(Server.MapPath("file") + "/" + filename);
            }
            else
            {
               Response.Write("<script language='javascript'>alert('"+fn.Substring(fn.LastIndexOf(".")+1).ToLower()+"请选择格式为“jpg”或“gif”的图片或格式为“swf”的flash')</script>");
               return;
            }
            Response.Write("<script language='javascript'>alert('上传成功')</script>");
         }
         else
         {
            Response.Write("<script language='javascript'>alert('没有图片')</script>");
            return;
         }
   }

   static public string getRandomFilename()
   {
         System.Random rand = new System.Random();
         DateTime now = DateTime.Now;
         string str = "";
         str += now.Year.ToString();
         //str += now.Year.ToString().Substring(now.Year.ToString().LastIndexOf("0")+1).Trim();
         str += now.Month.ToString();
         str += now.Day.ToString();
         str += now.Hour.ToString();
         str += now.Minute.ToString();
         str += now.Second.ToString();
         str += rand.Next(0, 1000);
         return str;
   }

欢迎光临站长论坛 (http://tzlink.com/bbs/)