邮件系统使用的上传附件方法

<form id="mail" method="post" runat="server"><table border="0" cellpadding="0" cellspacing="0" style="BORDER-COLLAPSE: collapse" bordercolor="#111111"width="39%" id="AutoNumber1" height="75"><tr><td width="100%" height="37"><INPUT id="myFile" style="WIDTH: 297px; HEIGHT: 22px" type="file" size="30" name="myFile"runat="server"> <asp:button id="Upload" runat="server" Text="上传附件"></asp:button></td></tr><tr><td width="100%" height="38">共计<asp:textbox id="P_size" runat="server" Width="65px"></asp:textbox>KB     <asp:dropdownlist id="dlistBound" runat="server"></asp:dropdownlist>  <asp:button id="btnDel" runat="server" Text="删除附件"></asp:button></td></tr></table></form>

后台CS代码

public class Upload_Mail : System.Web.UI.Page    {        protected System.Web.UI.WebControls.Button Upload;        protected System.Web.UI.WebControls.DropDownList dlistBound;        protected System.Web.UI.WebControls.TextBox P_size;        protected System.Web.UI.WebControls.Button btnDel;        protected System.Web.UI.HtmlControls.HtmlInputFile myFile;            private void Page_Load(object sender, System.EventArgs e)        {

            if (!IsPostBack)             {                //没有附件的状态                dlistBound.Items.Clear();                ArrayList arr = new ArrayList();                arr.Add("--没有附件--");                dlistBound.DataSource = arr ;                dlistBound.DataBind();                P_size.Text = "0";            }        }

        private void Upload_Click(object sender, System.EventArgs e)        {            if(myFile.PostedFile !=null)            {                HttpFileCollection files  = HttpContext.Current.Request.Files;                HttpPostedFile postedFile = files[0];                string fileName = System.IO.Path.GetFileName(postedFile.FileName);                string path = Request.PhysicalApplicationPath+@"UploadMail/"+ fileName;                postedFile.SaveAs(path);

                //数组对上存附件进行实时绑定                if((string)Session["udMail"]==null)                {                    Session["udMail"] = fileName;                }                else                {                    Session["udMail"] = (string)Session["udMail"]+"|"+fileName;                }

                string[] udMail = Session["udMail"].ToString().Split('|');                ArrayList list = new ArrayList(udMail);                list.Reverse();                udMail=(string[])list.ToArray(typeof(string));                dlistBound.Items.Clear();                long dirsize=0;                for(int i = 0;i<udMail.Length;i++)                {                    string  IndexItem =  udMail[i];                    string  VauleItem = Request.PhysicalApplicationPath+@"UploadMail/"+udMail[i];                    dlistBound.Items.Add(new ListItem(IndexItem,VauleItem));                    System.IO.FileInfo mysize = new System.IO.FileInfo(@VauleItem);                    dirsize += System.Convert.ToInt32(mysize.Length/1024)+1;                }                P_size.Text = dirsize.ToString();

            }        }

        private void btnDel_Click(object sender, System.EventArgs e)        {            string trueDelfile = dlistBound.SelectedValue.ToString();            string Delfile = dlistBound.SelectedItem.ToString();            usageIO.DeletePath(trueDelfile);

            if(Session["udMail"] != null)            {                int index = Session["udMail"].ToString().IndexOf("|");                if(index == -1)                {                    Session["udMail"] = null;                    dlistBound.Items.Clear();                    dlistBound.Items.Add("--没有附件--");                    P_size.Text = "0";                }                else                {

                    string[] udMail = Session["udMail"].ToString().Split('|');                    ArrayList values = new ArrayList(udMail);                    values.Remove(Delfile);                    string s = null;                    for(int i=0;i<values.Count;i++)                    {                        if(values.Count!=0)                        {                            s += values[i].ToString()+"|";                        }                    }                    if(s!=""||s!=null)                    {                        s =  s.TrimEnd('|');                    }                    Session["udMail"] = s;

                    string[] uMail = Session["udMail"].ToString().Split('|');                    ArrayList list = new ArrayList(uMail);                    list.Reverse();                    uMail=(string[])list.ToArray(typeof(string));                    dlistBound.Items.Clear();                    long dirsize=0;                    for(int i = 0;i<uMail.Length;i++)                    {                        string  IndexItem =  uMail[i];                        string  VauleItem = Request.PhysicalApplicationPath+@"UploadMail/"+uMail[i];                        dlistBound.Items.Add(new ListItem(IndexItem,VauleItem));

                        System.IO.FileInfo mysize = new System.IO.FileInfo(@VauleItem);                        dirsize += System.Convert.ToInt32(mysize.Length/1024)+1;                    }                    P_size.Text = dirsize.ToString();                }            }

        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码        override protected void OnInit(EventArgs e)        {            //            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。            //            InitializeComponent();            base.OnInit(e);        }                /** <summary>        /// 设计器支持所需的方法 - 不要使用代码编辑器修改        /// 此方法的内容。        /// </summary>        private void InitializeComponent()        {                this.Upload.Click += new System.EventHandler(this.Upload_Click);            this.btnDel.Click += new System.EventHandler(this.btnDel_Click);            this.Load += new System.EventHandler(this.Page_Load);

        }        #endregion    }