我的下载管理

作了几个小项目,经常有"下载天地"这个栏目。因为文件一般是从远程通过ftp传到服务器上的，在后台的管理上，当需要添加一个下载条目时，以前的办法是，需要手工添加下载路径和文件大小，特别麻烦。后来看到ftb1.6.5上传图片的例子后，觉得这种方法完全可以用到后台选择文件的场合。于是，用了一天的功夫，实现了这个功能。（小弟愚笨，花了1天时间，大家不要笑啊）

filelist.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;

namespace hwtkd.manage
{
    /**//// <summary>
    /// filelist 的摘要说明。
    /// </summary>
    public class filelist : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Panel Filepanel;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            if(!Page.IsPostBack)
            {
                rootpath = Request.QueryString["root"];
                currentfolder = "";                    
            }
            else
            {
                rootpath = Request.Form["RootFolder"].ToString().Replace("\\", "\");
                currentfolder = Request.Form["CurrentFolder"].ToString().Replace("\\", "\");
            }

            RootFolder.Value = rootpath;
            CurrentFolder.Value = currentfolder;
            path = System.Web.HttpContext.Current.Request.PhysicalApplicationPath + rootpath + currentfolder;

            DisplayList();
        }

        protected System.Web.UI.HtmlControls.HtmlInputHidden SelectedFile;
        protected System.Web.UI.HtmlControls.HtmlInputHidden RootFolder;
        protected System.Web.UI.HtmlControls.HtmlInputHidden CurrentFolder;

        string rootpath;
        string currentfolder;
        string path;
        protected System.Web.UI.HtmlControls.HtmlInputButton sub;

        private static string[] extentionlist = ("ai|pdf|asp|txt|asx|avi|bmp|c|cda|cgi|cpp|cs|css|dsw|fla|gif|h|htm|html|java|jpg|js|midi|mov|mp3|mpg|php|png|psd|" + 
                "psp|rar|rm|sln|swf|tiff|unkown|wav|wm|wma|wmd|wmv|xml|zip").Split('|');

        private void DisplayList()
        {            
            Filepanel.Controls.Clear();

            FileInfoList infolist = new FileInfoList(path);
            FileInfo[] filelist = infolist.FileList;
            DirectoryInfo[] directorylist = infolist.DirectoryList;

            if(currentfolder != "")
            {
                Panel holder = new Panel();    
                holder.CssClass = "imageholder";
                HtmlImage image = new HtmlImage();
                image.Src = "fileimages/parent.jpg";
                image.Attributes["class"] = "img";
                image.Attributes["unselectable"]="on";
                image.Attributes["align"] = "absmiddle";

                holder.Attributes["unselectable"]="on"; 
                holder.Attributes["onclick"]="divClick(this,'');";                 
                if(currentfolder.IndexOf("\") == -1)
                {
                    holder.Attributes["ondblclick"]="gotoFolder('" + rootpath + "','');"; 
                }
                else
                {                    
                    holder.Attributes["ondblclick"]=("gotoFolder('" + rootpath + "','" + currentfolder.Substring(0, currentfolder.LastIndexOf("\", currentfolder.Length - 2, currentfolder.Length - 1) + 1) + "');").Replace("\", "\\");
                }
                holder.Controls.Add(image);

                Panel mainpanel = new Panel();                
                mainpanel.CssClass = "imagespacer";
                mainpanel.Controls.Add(holder);

                Panel foldertitle = new Panel();
                foldertitle.CssClass = "titleHolder";
                foldertitle.Controls.Add(new LiteralControl("返回"));

                mainpanel.Controls.Add(foldertitle);

                Filepanel.Controls.Add(mainpanel);
            }

            foreach(DirectoryInfo info in directorylist)
            {
                Panel holder = new Panel();    
                holder.CssClass = "imageholder";
                HtmlImage image = new HtmlImage();
                image.Src = "fileimages/folder.jpg";
                image.Attributes["class"] = "img";
                image.Attributes["unselectable"]="on"; 
                image.Attributes["align"] = "absmiddle";
                
                holder.Attributes["unselectable"]="on"; 
                holder.Attributes["onclick"]="divClick(this,'');";                
                holder.Attributes["ondblclick"] = ("gotoFolder('" + rootpath + "','" + currentfolder + info.Name + "\');").Replace("\", "\\");
            
                holder.Controls.Add(image);

                Panel mainpanel = new Panel();                
                mainpanel.CssClass = "imagespacer";
                mainpanel.Controls.Add(holder);

                Panel foldertitle = new Panel();
                foldertitle.CssClass = "titleHolder";
                foldertitle.Controls.Add(new LiteralControl(info.Name));

                mainpanel.Controls.Add(foldertitle);

                Filepanel.Controls.Add(mainpanel);
            }

            foreach(FileInfo info in filelist)
            {
                Panel holder = new Panel();    
                holder.CssClass = "imageholder";                 
                HtmlImage image = new HtmlImage();
                string extention = info.Extension.ToLower().Substring(1);                
                foreach(string str in extentionlist)
                {
                    if(str == extention)
                    {
                        image.Src = "fileimages/" + extention + ".jpg";
                        break;
                    }
                }
                if(image.Src == "")
                {
                    image.Src = "fileimages/unkown.jpg";
                }                
                image.Attributes["class"] = "img";
                image.Attributes["unselectable"]="on";
                image.Attributes["align"] = "absmiddle";

                holder.Attributes["onclick"]="divClick(this,'" + info.Name + "');";
                holder.Attributes["ondblclick"]=("returnFile('" + rootpath + "','" + currentfolder + info.Name + "','" +FormatFileSize(info.Length) + "');").Replace("\", "\\");
                holder.Attributes["unselectable"]="on";
                holder.Controls.Add(image);

                Panel mainpanel = new Panel();                
                mainpanel.CssClass = "imagespacer";
                mainpanel.Controls.Add(holder);

                Panel foldertitle = new Panel();
                foldertitle.CssClass = "titleHolder";
                foldertitle.Controls.Add(new LiteralControl(info.Name + "<br>" + FormatFileSize(info.Length)));

                mainpanel.Controls.Add(foldertitle);

                Filepanel.Controls.Add(mainpanel);
            }
        }

        private string GetRelativePath(string path, string path2)
        {
            return path.Replace(path2 + "\", "");
        }

        private string FormatFileSize(long length)
        {
            if(length < 0.5 * 1024 * 1024)
            {                
                return (length / 1024f).ToString("##0.00K");
            }
            else
            {
                return ((float)length / (1024 * 1024)).ToString("##0.00M");
            }
        }

        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.sub.ServerClick += new System.EventHandler(this.sub_ServerClick);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion        

        private void sub_ServerClick(object sender, System.EventArgs e)
        {
            ;
        }

    }

    public class FileInfoList
    {
        public FileInfoList()
        {
            isruned = false;            
        }

        public FileInfoList(string path):this()
        {
            this.path = path;
        }

        private FileInfo[] filelist;
        private DirectoryInfo[] directorylist;
        private string path;
        private bool isruned;

        public string Path
        {
            get{return path;}
            set{path = value;}
        }

        public FileInfo[] FileList
        {
            get
            {
                if(!isruned)
                {
                    RefreshInfo();
                }

                return filelist;
            }
        }

        public DirectoryInfo[] DirectoryList
        {
            get
            {
                if(!isruned)
                {
                    RefreshInfo();
                }

                return directorylist;
            }
        }    

        public void  RefreshInfo()
        {    
            DirectoryInfo directory = new DirectoryInfo(path);

            filelist = directory.GetFiles();
            directorylist = directory.GetDirectories();

            isruned = true;
        }
        
    }
}

filelist.aspx

<%@ Page language="c#" Codebehind="filelist.aspx.cs" AutoEventWireup="false" Inherits="hwtkd.manage.filelist" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>filelist</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
        <style> BODY {}{ BORDER-RIGHT: 0px; PADDING-RIGHT: 0px; BORDER-TOP: 0px; PADDING-LEFT: 0px; BACKGROUND: #ffffff; PADDING-BOTTOM: 0px; MARGIN: 0px; OVERFLOW: hidden; BORDER-LEFT: 0px; WIDTH: 100%; PADDING-TOP: 0px; BORDER-BOTTOM: 0px }
    BODY {}{ FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: "宋体",Verdana, Arial, Helvetica, sans-serif }
    TR {}{ FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: "宋体",Verdana, Arial, Helvetica, sans-serif }
    TD {}{ FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: "宋体",Verdana, Arial, Helvetica, sans-serif }
    DIV.imagespacer {}{ FLOAT: left; MARGIN: 5px; FONT: 10pt verdana; OVERFLOW: hidden; WIDTH: 120px; HEIGHT: 126px; TEXT-ALIGN: center }
    DIV.imageholder {}{ BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 0px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 100px; PADDING-TOP: 0px; BORDER-BOTTOM: #cccccc 1px solid; HEIGHT: 100px ;valign:absmiddle;}
    DIV.titleholder {}{ FONT-SIZE: 8pt; OVERFLOW: hidden; WIDTH: 100px; FONT-FAMILY: ms sans serif, arial; WHITE-SPACE: nowrap; TEXT-OVERFLOW: ellipsis }
    .img {}{ WIDTH: 72px; HEIGHT: 72px;}
    DIV.main{}{
        width=100%; height:100%; overflow: auto;
    }
        </style>
        <script language="javascript">
lastDiv = null;
function divClick(theDiv,filename) {
    if (lastDiv) {
        lastDiv.style.border = "1 solid #CCCCCC";
    }
    lastDiv = theDiv;
    theDiv.style.border = "2 solid #316AC5";
    
    document.getElementById("SelectedFile").value = filename;

}
function gotoFolder(rootfolder,newfolder) 
{
    document.getElementById("RootFolder").value = rootfolder;
    document.getElementById("CurrentFolder").value = newfolder;    
    __doPostBack('sub','');
}        
function returnFile(rootfolder,filepath,filesize) {
    var arr = new Array();
    arr["rootfolder"] = rootfolder;  
    arr["filepath"] = filepath;
    arr["filesize"] = filesize;
    window.parent.returnValue = arr;
    window.parent.close();
}        
        </script>
        <base target="_self">
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <table width="100%" height="100%" border="0" cellpadding="3" cellspacing="0">
                <tr>
                    <td><asp:Panel id="Filepanel" runat="server" CssClass="main"></asp:Panel></td>
                </tr>
                <tr>
                    <td height="16" style="padding-left:10px;border-top: 1 solid #999999; background-color:#99ccff;"><INPUT type="button" value="刷新" id="sub" runat="server"></td>
                </tr>                
            </table>
            <input type="hidden" id="SelectedFile" runat="server"> <input type="hidden" id="RootFolder" Value="images" runat="server">
            <input type="hidden" id="CurrentFolder" Value="images" runat="server">
        </form>
    </body>
</HTML>

filelist.aspx页面需要另外一个页面用调用

<script language=javascript>
        function FindFile()
        {
            var arr=window.showModalDialog("filelist.aspx?root=" + window.encodeURIComponent("upload\file\"), "", "dialogWidth:570px;status:no");
            if(arr == null)
                return;
            var arr1=new String(arr["rootfolder"]);
            var arr2=new String(arr["filepath"]);
            var arr3 = new String(arr["filesize"]);
            document.getElementById("URL").value = format(arr1 + arr2);
            document.getElementById("Size").value = arr3;
        }
        function format(strin)
        {
            strout="";
            for(i=0;i<strin.length;i++)
            {
                s=strin.charAt(i);
                if(s=='\')
                    strout+="/";
                else
                    strout+=s;
            }
            return strout;
        }
        </script>