.net中用button和一个文本框实现FileUpload的功能

这个是最基础的上传吧...可以参考http://download.csdn.net/source/1050100另:附个例子参考%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUP.aspx.cs" Inherits="FileUP" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<script language="JavaScript" type="text/javascript">
function addFile()
{
var str = '<input type="file" size="50" name="File">'
document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
}
</script>
</head>
<body>
<form id="form1" method="post" runat="server" enctype="multipart/form-data">
<div align="center">
<h3>多文件上传</h3>
<p id="MyFile"><input type="file" size="50" name="File"/></p>
<p>
<input type="button" value="增加(Add)" onclick="addFile()"/>
<input onclick="this.form.reset()" type="button" value="重置(ReSet)"/>
<asp:Button Runat="server" Text="开始上传" ID="UploadButton"></asp:Button>
</p>
<p>
<asp:Label id="strStatus" runat="server" Font-Names="宋体" Font-Bold="True" Font-Size="9pt"
Width="500px" BorderStyle="None" BorderColor="White"></asp:Label>
</P>
</div>
</form>
</body>
</html>
///*******************************cs代码*************************************///using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;public partial class FileUP : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
/// 在此处放置用户代码以初始化页面
if (this.IsPostBack) this.SaveImages();
}private Boolean SaveImages()
{
///'遍历File表单元素
HttpFileCollection files = HttpContext.Current.Request.Files;/// '状态信息
System.Text.StringBuilder strMsg = new System.Text.StringBuilder();
strMsg.Append("上传的文件分别是：<hr color=red>");
try
{
for(int iFile = 0; iFile < files.Count; iFile++)
{
///'检查文件扩展名字
HttpPostedFile postedFile = files[iFile];
string fileName, fileExtension;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
if (fileName != "")
{
fileExtension = System.IO.Path.GetExtension(fileName);
strMsg.Append("上传的文件类型：" + postedFile.ContentType.ToString() + "<br>");
strMsg.Append("客户端文件地址：" + postedFile.FileName + "<br>");
strMsg.Append("上传文件的文件名：" + fileName + "<br>");
strMsg.Append("上传文件的扩展名：" + fileExtension + "<br><hr>");
///'可根据扩展名字的不同保存到不同的文件夹
///注意：可能要修改你的文件夹的匿名写入权限。
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("UploadFiles/") + fileName);
}
}
strStatus.Text = strMsg.ToString();
return true;
}
catch(System.Exception Ex)
{
strStatus.Text = Ex.Message;
return false;
}
}
无组件上传？
namespace ShowBo.AspNetUpLoad
{
    using System;
    using System.IO;
    using System.Web;
    using System.Text;
    using System.Collections;
    /// <summary>
    /// 文件结构
    /// </summary>
    public struct MyFileInfo
    {
        public string FileName;//服务器端的文件名
        public string SFileName;//客户端的文件名
        public byte[] FileData;//文件的2进制数据
    }
    /// <summary>
    /// 表单项收集
    /// </summary>
    public class FormCollection : DictionaryBase
    {
        /// <summary>
        /// 添加项目
        /// </summary>
        /// <param name="Key">键</param>
        /// <param name="Value">值</param>
        public void Add(string Key, string Value)
        {
            Dictionary.Add(Key, Value);
        }
        /// <summary>
        /// 获取或设置对应的键值
        /// </summary>
        /// <param name="Key">键</param>
        /// <returns>值</returns>
        public string this[string Key]
        {
            get { return (string)Dictionary[Key]; }
            set { Dictionary[Key] = value; }
        }
        /// <summary>
        /// 重写叠代借口返回，返回string类型
        /// </summary>
        /// <returns>IEnumerator叠代接口</returns>
        public new IEnumerator GetEnumerator()
        {
            foreach (DictionaryEntry de in Dictionary)
            {
                yield return (string)de.Value;
            }
        }
        /// <summary>
        /// 删除键值
        /// </summary>
        /// <param name="Key">要删除的键值</param>
        public void Remove(string Key)
        {
            Dictionary.Remove(Key);
        }
    }
    /// <summary>
    /// 上传文件收集，信息为2进制
    /// </summary>
    public class FileCollection : DictionaryBase
    {
        public void Add(string Key, MyFileInfo fileInfo)
        {
            Dictionary.Add(Key, fileInfo);
        }
        public void Remove(string Key)
        {
            Dictionary.Remove(Key);
        }
        /// <summary>
        /// 重写迭代接口接口
        /// </summary>
        /// <returns>返回文件的MyFileInfo结构体</returns>
        public new  IEnumerator GetEnumerator()
        {
            foreach (DictionaryEntry de in Dictionary)
            {
                yield return (MyFileInfo)de.Value;
            }
        }
        public MyFileInfo this[string Key]
        {
            get { return (MyFileInfo)Dictionary[Key]; }
            set { Dictionary[Key] = value; }
        }
    }
    /// <summary>
    /// 文件上传类
    /// </summary>
    public class UpLoad
    {
        #region 变量申明
        private byte[] FormData; //表单的2进制数据数组
        private int formSize;//总上传字节数
        private string allowExts;//默认的可以上传的文件扩展名称
        private string rootPath;//文件保存的目录
        private string fileErr;//文件错误信息，例如文件大小超过，扩展名不允许
        private string allFile;//保存所有成功上传的文件名称

        private int maxFileSize;//默认上传大小为200kb
        private int fileCount;//总的上传的文件个数
        private byte[] SplitStr;//2进制分隔符号
        private int SplitStrLen;//分隔符号长度
        byte[] CLStr = new byte[] { 13, 10 };//2进制回车
        private FileCollection fileCollections = new FileCollection();//文件信息集合
        private FormCollection formCollections = new FormCollection();//表单信息集合
        private BinaryReader binReader;//2进制读取器
        #endregion
        #region 属性
        /// <summary>
        /// 默认的可以上传的文件扩展名称
        /// </summary>
        public string AllowExts
        {
            get { return allowExts; }
            set { allowExts = value; }
        }
        /// <summary>
        /// 文件保存的目录
        /// </summary>
        public string RootPath
        {
            get { return rootPath; }
            set
            {
                string tempPath = value;
                if (tempPath.LastIndexOf("/") == -1)
                    rootPath = tempPath + "/";
                else
                    rootPath = tempPath;
            }
        }
        /// <summary>
        /// 错误信息，只读属性
        /// </summary>
        public string ErrorStr
        {
            get
            {
                if (fileErr != "")
                    fileErr = "发生如下错误\n" + fileErr;
                return fileErr;
            }
        }
        /// <summary>
        /// 文件信息集合，2进制流形式缓存数据，只读属性
        /// </summary>
        public FileCollection FileCollections
        {
            get { return fileCollections; }
        }
        /// <summary>
        /// 表单信息集合，只读属性
        /// </summary>
        public FormCollection FormCollections
        {
            get { return formCollections; }
        }
        /// <summary>
        /// 所有文件在服务器上生成的文件名，只读属性
        /// </summary>
        public string FileNames
        {
            get
            {
                return allFile;
            }
        }
        /// <summary>
        /// 文件数量，只读属性
        /// </summary>
        public int FileCount
        {
            get { return fileCount; }
        }
        #endregion

        public UpLoad()
        {
            allowExts = "jpg|png|gif";
            rootPath = "uploadfiles/";
            maxFileSize = 200;
            allFile = "";
            fileErr = "";
            fileCount = 0;
        }
        /// <summary>
        /// 保存文件到硬盘
        /// </summary>
        public void Save()
        {
            string FilePath = "";
            FileStream fileStream;
            foreach (MyFileInfo mfi in fileCollections)
            {
                try
                {
                    FilePath = HttpContext.Current.Server.MapPath(rootPath + mfi.FileName);//获取文件的物理路径
                    fileStream = new FileStream(FilePath, FileMode.OpenOrCreate);
                    fileStream.Write(mfi.FileData, 0, mfi.FileData.Length);
                    fileStream.Flush();
                    fileStream.Close();
                }
                catch
                {
                    fileErr += mfi.SFileName+"保存失败！\n";
                }
            }
        }
        /// <summary>
        /// 以时间和文件第几个为文件重新命名
        /// </summary>
        /// <param name="Ext">扩展名</param>
        /// <param name="fileCount">第几个文件，防止服务器处理速度快，一个时间内能处理几个文件，那么用时间生成的文件名有可能被覆盖。</param>
        /// <returns>新文件名</returns>
        private string getFileName(string Ext, int fileCount)
        {
            return DateTime.Now.ToString().Replace(":", "").Replace(" ", "").Replace("-", "") + fileCount.ToString() + "." + Ext;
        }
        /// <summary>
        /// 获取表单数据项目
        /// </summary>
        public void CollectFormDatas()
        {
            string sfilename = "", fileExt = "",FileName="";
            string Key = "";//表单键名称
            int DataSize, headstart, headend;
            formSize = HttpContext.Current.Request.TotalBytes;
            if (formSize < 1)
            {
                ErrHandle("没有选择上传的文件！");
            }
            FormData = new byte[formSize];
            binReader = new BinaryReader(HttpContext.Current.Request.InputStream);
            binReader.Read(FormData, 0, formSize);
            SplitStrLen = InStrB(0, FormData, CLStr);
            SplitStr = new byte[SplitStrLen];
            binReader.BaseStream.Position = 0;//设置流位置
            binReader.Read(SplitStr, 0, SplitStrLen);//获取2进制分隔符号
            headstart = SplitStrLen + 2;//第一个集合的描述信息位置
            do
            {
                headend = InStrB(headstart, FormData, new byte[] { CLStr[0], CLStr[1], CLStr[0], CLStr[1] });//两对回车换行符
                DataSize = InStrB(headend + 4, FormData, SplitStr) - (headend + 4)-2;
                fileExt = getExt(headstart, headend - headstart , ref sfilename, ref Key);
                if (fileExt == null)//表单集合
                {
                    formCollections.Add(Key, ReadData(headend+4, DataSize));
                }
                else if (fileExt != "")//文件
                {

                    if (!checkFileSize(DataSize))
                        fileErr = fileErr + sfilename + "上传失败，文件大小超过" + maxFileSize + "KB！\n";
                    else if (!checkExt(fileExt))
                        fileErr = fileErr + sfilename + "上传失败，文件类型 " + fileExt + " 不允许上传！\n";
                    else
                    {
                        fileCount = fileCount + 1;//累计文件个数
                        FileName = getFileName(fileExt, fileCount);
                        ReadData(headend+4, DataSize, Key,FileName,sfilename);
                    }
                }
                //计算下项开始位置
                headstart = (headend+4) + DataSize +2+ (SplitStrLen + 2);
            } while (headstart + 2 < formSize);
            binReader.Close();  //关闭流
        }
        /// <summary>
        /// 错误处理
        /// </summary>
        /// <param name="ErrMsg">发生的错误</param>
        private void ErrHandle(string ErrMsg)
        {
            ErrMsg = ErrMsg.Replace("'", "\'");//防止脚本符号的嵌套出错
            HttpContext.Current.Response.Write("<script>alert('" + ErrMsg + "');history.back();</" + "script>");
            HttpContext.Current.Response.End();
        }
private int InStrB(int startPosition, byte[] b, byte[] sb)
        {
            int blen = b.Length;
            if (startPosition >= blen)
                return -1;
            int sblen = sb.Length;
            int postion = -1;
            if (sblen == 0)
                return -1;
            for (int i = startPosition; i < blen; i++)
            {
                if (b == sb[0])
                {
                    int TempI = i + 1;
                    bool Find = true; ;
                    for (int j = 1; j < sblen && TempI < blen; j++, TempI++)
                    {
                        if (b[TempI] == sb[j])
                            continue;
                        else
                        {
                            Find = false;
                            break;
                        }
                    }
                    if (Find)
                    {
                        postion = i;
                        break;
                    }
                }
            }
            return postion;
        }
    }
}
测试页面
<!!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>asp.net无组件上传</title>
    <meta http-equiv="content-type" content='text/html;utf-8' />
</head>
<body>
<script type="text/javascript">
function check(f)
{
   var choose=false;
   //至少要选择一个文件
   for(var i=0;i<10;i++)
   {
     if(eval("f.myfile"+i)!=undefined)
     {
         if(eval("f.myfile"+i).value!="")
         {
           choose=true;
           break;
         }
      }
   }
   if(!choose)
   {
       alert('请选择上传的文件！');
       f.myfile0.focus();
       return false;
   }
}
function SetFile()
{
  var fc=document.getElementById('filecount');
  if(fc.value=="")
  {
    alert('文件个数不能为空！');
    fc.focus();
    return ;
  }
  if(isNaN(fc.value))
  {
    alert('文件个数为整数！');
    fc.select();
    return;
  }
  var count=parseInt(fc.value);
  if(count<1||count>10)
  {
    alert('一次上传文件个数为1-10个！');
    fc.select();
    return false;
  }
  var div=document.getElementById('divFile');
  div.innerHTML="";
  for(var i=0;i  {
     div.innerHTML+='请选择文件：<input type="file" name="myfile'+i+'" style="width:200px" /><br/>';
  }
}
</script>
<form method="post" enctype='multipart/form-data' action="getfile.aspx" >
　文件个数：<input type="text" size='2' name='filecount' id='filecount' />(1-10个)<input type="button" onclick='SetFile()' value="设置上传个数"/>
<div id='divFile'>请选择文件：<input type="file" name="myfile0" style="width:200px" /></div>
<input type="submit" value='开始上传' />
</form>
</body>
</html>接收页面
<%@ Page Language="C#" %>
<%@ Import Namespace="ShowBo.AspNetUpLoad" %>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        UpLoad upload = new UpLoad();
        upload.CollectFormDatas();
        upload.Save();
        string Err = upload.ErrorStr;
        Response.Write(upload.FormCollections["filecount"]);
        if (Err != "")
            Response.Write(Err);
        else
            Response.Write("Ok");
    }
</script>
~~Kao~居然要发两次~

调试易

.net中用button和一个文本框实现FileUpload的功能

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