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html 上传多文件

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页面文件

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UpLoad.aspx.cs" Inherits="up_UpLoad" %>

<!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>Untitled Page</title>
    <script type="text/javascript">
     var i = 1;
     
     function show()
     {     
         if(i >= 5)
      {
       alert("提示:最多只能上传4个附件!");
          return false;
      }
      
      var file = document.createElement("input");
      file.type = "file";
      file.id = file.name = "file" + i;
      
      document.getElementById("div").appendChild(file);
      
      var btn = document.createElement("input");
      btn.value = "删除";
      btn.type = "button";
      btn.id = btn.name = "btn" + i;
      btn.onclick = function()
      {
       document.getElementById("div").removeChild(file);
       document.getElementById("div").removeChild(btn);
       document.getElementById("div").removeChild(br);
       
       i--;
      }
      
      document.getElementById("div").appendChild(btn);
      var br = document.createElement("br");
      document.getElementById("div").appendChild(br);
      i++;
     }
     
    </script>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data" >
        <div>       
            <asp:Button ID="Button1" runat="server" Text="UpLoad" OnClick="Button1_Click" /><br /><br />
           
            <div id = 'div'></div>
            <input type="button" onclick="show()" value="添 加">    
        </div>
    </form>
</body>
</html>

CS文件

HttpFileCollection files = HttpContext.Current.Request.Files;

        for (int i = 0; i < files.Count; i++)
        {
            HttpPostedFile file = files[i] as HttpPostedFile;

            string fileName = Path.GetFileName(file.FileName);
            string path = Server.MapPath("File/"); 
                       
            // 保存
            file.SaveAs(path + fileName);
        }
               

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