(仿163)Asp.Net多附件上传

对于asp.net程序,我们应该尽可能的提供一个便捷的用户接口,减少页面回传就是其中之一。
本文演示一次上传多个文件的方法,在客户端可以随意控制上传文件的个数,但是注意总文件大小不能过大,否则会有异常抛出。至于解决大文件上传的方法已经超出本文的讨论范围。
<注:大附件办法>
<
<configuration>  
        <system.web>  
              <httpRuntime   maxRequestLength="10000"  
                      useFullyQualifiedRedirectUrl="true"  
                      executionTimeout="45"/>  
          </system.web>  
  </configuration>
需要将machine.config或web.config中的<httpRuntime>   section的maxRequestLength值作相应的修改.  
>
这里有一个要点大家不要忽略了,否则程序不能正常工作。
就是必须指定form的enctype="multipart/form-data" 属性
代码如下:
<%@ Page language="c#" Codebehind="MultiAttchments.aspx.cs" AutoEventWireup="false" Inherits="WebApplication3.MultiAttchments" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML>      <HEAD>           
<script>           
function AddAttachments()           
{                 
document.getElementById('attach').innerText = "继续添加附件";                                   
tb = document.getElementById('attAchments');                                   
newRow = tb.insertRow();                 
newRow.insertCell().innerHTML = "<input name='File' size='50' type='file'>&nbsp;&nbsp;
<input type=button value='删除' onclick='delFile(this.parentElement.parentElement.rowIndex)'>";           
}           
function delFile(index)           
{                 
document.getElementById('attAchments').deleteRow(index);                 
tb.rows.length > 0?document.getElementById('attach').innerText = "继续添加附件":document.getElementById('attach').innerText = "添加附件";           
}           
</script>     
</HEAD>     
<body MS_POSITIONING="GridLayout">           
<form id="form1" method="post" runat="server" enctype="multipart/form-data">           
<div>
<table id="attAchments">
</table>
</div>
<span>
<IMG src="icoAddFl.gif">
</span>
<A id="attach" style="font-family:宋体;font-size:9pt;" title="如果您要发送多个附件,您只需多次点击“继续添加附件”即可, 要注意附件总量不能超过发送限制的大小。" href="javascript:;" name="attach">添加附件</A>                  <br>
<br>
<br>
<br>
<br>
<br>                 
<asp:Button id="btnSend" runat="server" Text=" 上传 "></asp:Button>           
</form>     
</body>
</HTML>
            
private void btnSend_Click(object sender, System.EventArgs e)
{     
 StringBuilder sb = new StringBuilder();
                
 int attCount = 0;     
 string filePath = "";           
 for(int i=0; i< Request.Files.Count; i++)             
 {                 
  if(Request.Files[i].ContentLength > 0)                 
  {                       
   filePath = Request.Files[i].FileName;                       
   sb.Append("Files" + attCount++ + ": " + filePath + "<br>");                           Request.Files[0].SaveAs(Server.MapPath("./") + filePath.Substring(filePath.LastIndexOf(" \\")+1));                   }            }
 sb.Insert(0, "you upload " + attCount + " files.<br>");     
 Response.Write(sb.ToString());}

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