HTML代码如下,需要注意的是Form中添加的语句
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>Upload File</title>
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<script language="javascript" type="text/javascript">
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function addFile(index)
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{
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var obj = document.getElementById('file' + index);
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if(obj == null)
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{
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var strFile = '<span id=\"spFile\" + ' + index + '>文件次序:' + index + ' <input id="file' + index + '" name="file" type="file" style=\"width:530px\" onchange=\"addFile(' + ( index + 1 ) + ')\" contentEditable=\"false\" /><br /></span>';
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document.getElementById('divFile').insertAdjacentHTML('beforeEnd', strFile);
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}
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}
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</script>
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</head>
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<body>
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<form id="form1" runat="server" enctype="multipart/form-data"><%--此处一定要添加上这个==>>enctype="multipart/form-data"--%>
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<div>
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<asp:Button ID="btnUpload" runat="server" Text="上传文件" OnClick="btnUpload_Click" />
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<br />
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<div id="divFile">
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<span id="spFile1">
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文件次序:1 <input id="file1" name="file" type="file" style="width:530px" onchange="addFile(2)" contentEditable="false" /><br /></span>
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</div>
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</div>
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</form>
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</body>
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</html>
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btnUpload_Click事件代码
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protected void btnUpload_Click(object sender, EventArgs e)
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{
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for (int i = 0; i < Request.Files.Count; i++)
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{
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//关于上传文件大小,默认是4MB,如果需要将此文件扩大
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//请在web.config中<system.web>添加如下语句
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//<httpRuntime maxRequestLength="文件最大值" executionTimeout="3000"/>
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//这里文件最大值的单位是kb,而程序中的大小的单位是b
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//当然这里也可以进行大小的过滤
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if (Request.Files[i].ContentLength > 0)
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{
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//获取文件的扩展名,在这里可以控制上传文件的格式,假设仅仅允许上传rar文件
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string strExtension = System.IO.Path.GetExtension(Request.Files[i].FileName.ToLower());
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if (strExtension != ".rar")
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{
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//提示用户格式不正确
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return;
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}
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//最好自己写一个方法保证上传上去的文件名是绝对的唯一,这样可以保证一些不必要的麻烦
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string strFileName = DateTime.Now.ToString("yyyyMMddmmHHss");
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//保存路径,这个一般存放在web.config文件中
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//这个文件夹需要考虑到权限的问题
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string strPath = "c:\\upload\\";
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//上传图片
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Request.Files[i].SaveAs(strPath + strFileName + strExtension);
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}
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}
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}
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