最近在写C# .net代码的时候,遇到一个上传刷新的问题。
在新增数据项的时候,用ajax实现无刷新提交,但上传文件的时候,由于数据类型原因,不能将页面的<asp:FileUpload>中以字符串值的方式传到js里调用。我一共找到了两个方法予以解决,实现无刷新上传。
第一种方法:利用js的ADODB.Stream,将文件先转换成流,再通过js上传到服务器,这样有个好处就是可以上传超大文件,并且由于是数据流,可以支持断点续传、方便显示上传进度等人性化功能。唯一的缺点是要客户端浏览器需要设置安全级别,或者安装相关ActiveX控件(这个控件自己做的,加载到页面中)。
相关代码:
文件有:1个前台页面:upload.html、 1个js控制:upload.js、 1个后台处理页面:Accept.aspx(Accept.aspx.cs)
代码文件如下:
upload.html
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>无标题页</title>
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<mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script>
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</head>
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<body>
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<form id="form1" runat="server">
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<div style="width:100%">
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<input type="file" id="hidFilePath" />
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<input type="button" id="ok" onclick="BeginUpLoadFile('0', true)" title="上传" value="UpLoad"/>
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</div>
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<div id="lblLeavingsTime">TIME</div>
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<div id="returnInfo">Info</div>
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</form>
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</body>
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</html>
upload.js
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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var g_XMLHttp = null;
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var g_Stream = new ActiveXObject('ADODB.Stream');
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var g_SendCount = 0;
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var g_TotalCount = 0;
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var g_FileSize = 0;
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var g_UpFileType = 0 ;
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var g_BlockSize = 1024 * 100; //每段分为100K
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var fileExtName = "" ; //文件后缀名
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var g_PauseFlag = false;
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var g_BeginTime = null;
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var g_guageFlag = false ;
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var Nfilename = "" ;
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function Init()
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{
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InitTitleEvent();
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BeginUpLoadFile();
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}
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function MoveGuage()
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{
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var t_Time = new Date();
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var t_OddTime = Math.ceil((t_Time.getTime() - g_BeginTime.getTime()) / g_SendCount * (g_TotalCount - g_SendCount) / 1000);
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var t_OddTimeString = '';
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if(t_OddTime >= 3600)
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{
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t_OddTimeString = Math.floor(t_OddTime / 3600) + '时';
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t_OddTime %= 3600;
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}
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if(t_OddTime >= 60)
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{
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t_OddTimeString += Math.floor(t_OddTime / 60) + '分';
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t_OddTime %= 60;
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}
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document.all.lblLeavingsTime.innerText = t_OddTimeString + t_OddTime + '秒';
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}
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//第1个参数表示上传的类型,为命名新文件提供参考
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//第2个参数表示要不要显示状态条
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function BeginUpLoadFile(upFileType, guageFlag)
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{
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if(g_Stream == null)
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{alert("您的机器不支持ADODB.Stream."); }
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else
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{
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g_guageFlag = guageFlag ;
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g_UpFileType = upFileType;
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g_Stream.Type = 1;
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g_Stream.Open();
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var pth = document.getElementById("hidFilePath").value ;
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g_Stream.LoadFromFile(pth);
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var fname=pth.split('\\');
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Nfilename = fname[fname.length-1] ;
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fileExtName = Nfilename.split('.')[1].toLowerCase();
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g_Stream.position = 0;
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g_SendCount = 1;
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g_FileSize = g_Stream.size ;
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if (upFileType == 0) //上传图片
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{
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if (g_FileSize > 1024 * 1024 * 2 ) // 不能大于2M
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{
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document.all.returnInfo.innerText = "文件大小超过2M!" ;
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g_PauseFlag = true;
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return ;
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}
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var str = "bmp,jpg,jpeg,gif,png,icon";
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if (str.search(fileExtName) == -1) //图片格式不能超出范围
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{
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document.all.returnInfo.innerText = "文件格式不正确,请选择bmp、jpg、jpeg、gif、png、icon格式图片!" ;
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g_PauseFlag = true;
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return ;
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}
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}
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g_TotalCount = Math.ceil(g_Stream.size / g_BlockSize);
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g_BeginTime = new Date();
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SendData();
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}
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}
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function SendData()
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{
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if(g_PauseFlag)
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{
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return;
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}
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if(g_SendCount <= g_TotalCount)
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{
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var t_XMLDOM = null;
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var t_Root = null;
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var t_Node = null;
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var t_Attribute = null;
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t_XMLDOM = new ActiveXObject('Microsoft.XMLDOM');
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t_XMLDOM.async = false;
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t_XMLDOM.resolveExternals = false;
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t_Node = t_XMLDOM.createProcessingInstruction('xml','version="1.0"');
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t_XMLDOM.appendChild(t_Node);
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t_Root = t_XMLDOM.createElement('Root');
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t_XMLDOM.appendChild(t_Root);
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t_XMLDOM.documentElement.setAttribute('xmlns:dt','urn:schemas-microsoft-com:datatypes');
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t_Node = t_XMLDOM.createElement('Data');
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t_Node.dataType = 'bin.base64';
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t_Node.nodeTypedValue = g_Stream.Read(g_BlockSize);
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t_Attribute = t_XMLDOM.createAttribute('upfiletype');
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t_Attribute.value = g_UpFileType;
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t_Node.setAttributeNode(t_Attribute);
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t_Attribute = t_XMLDOM.createAttribute('fileindex');
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t_Attribute.value = g_SendCount;
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t_Node.setAttributeNode(t_Attribute);
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t_Attribute = t_XMLDOM.createAttribute('totalcount');
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t_Attribute.value = g_TotalCount;
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t_Node.setAttributeNode(t_Attribute);
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t_Attribute = t_XMLDOM.createAttribute('filesize');
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t_Attribute.value = g_FileSize;
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t_Node.setAttributeNode(t_Attribute);
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t_Attribute = t_XMLDOM.createAttribute('blocksize');
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t_Attribute.value = g_BlockSize;
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t_Node.setAttributeNode(t_Attribute);
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t_Attribute = t_XMLDOM.createAttribute('fileextname');
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t_Attribute.value = fileExtName;
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t_Node.setAttributeNode(t_Attribute);
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t_Root.appendChild(t_Node);
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g_XMLHttp = new ActiveXObject('Microsoft.XMLHttp');
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g_XMLHttp.open('POST','AcceptFile.aspx',true);
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g_XMLHttp.onreadystatechange = XMLHttpStateChange;
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g_XMLHttp.send(t_XMLDOM);
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if (g_guageFlag){ MoveGuage(); }
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}
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else
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{
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var xx = spider.BookFile.FileObj.getFileName() ;
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alert(xx.value) ;
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document.all.lblLeavingsTime.innerText = '0秒';
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CloseWindow(document.all.cmdClose);
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document.all.returnInfo.innerText = '文件上传完成!';
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}
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}
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function XMLHttpStateChange()
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{
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if(g_XMLHttp.readyState == 4)
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{
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var rstr = g_XMLHttp.responseText ;
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if(rstr == 'OK')
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{
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g_SendCount++;
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SendData();
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}
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else
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{
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document.all.returnInfo.innerText = rstr;
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CloseWindow(document.all.cmdClose);
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}
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}
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}
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function CloseWindow(p_OBJ)
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{
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g_PauseFlag = true;
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g_Stream.Close();
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}
155![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
Accept.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AcceptFile.aspx.cs" Inherits="commonJS_AcceptFile" %>
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
Accept.aspx.cs
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.Xml;
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using System.IO;
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using spider.BookFile; //这是自己写的文件类
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public partial class commonJS_AcceptFile : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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AjaxPro.Utility.RegisterTypeForAjax(typeof(FileObj));
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XmlDocument t_XmlDocument = new XmlDocument();
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t_XmlDocument.Load(this.Request.InputStream);
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XmlNode t_XmlNode = t_XmlDocument.SelectSingleNode("Root/Data");
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FileObj t_FileOBJ = new FileObj();
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string t_upfiletype = t_XmlNode.Attributes["upfiletype"].Value;
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string t_FileIndex = t_XmlNode.Attributes["fileindex"].Value;
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string t_totalcount = t_XmlNode.Attributes["totalcount"].Value;
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string t_filesize = t_XmlNode.Attributes["filesize"].Value;
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string t_blocksize = t_XmlNode.Attributes["blocksize"].Value;
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string t_fileextname = t_XmlNode.Attributes["fileextname"].Value;
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byte[] t_File = Convert.FromBase64String(t_XmlNode.FirstChild.Value);
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FileObj.upfile myUpFile = new FileObj.upfile();
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myUpFile.FileCount = t_totalcount;
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myUpFile.FileIndex = t_FileIndex;
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myUpFile.UpFileType = t_upfiletype;
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myUpFile.FileSize = t_filesize;
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myUpFile.BlockSize = t_blocksize;
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myUpFile.ExtName = t_fileextname;
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myUpFile.t_File = t_File;
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FileObj.InsertFileList(myUpFile);
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if (FileObj.getErrMsg == "")
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{
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this.Response.Write("OK");
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}
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else
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{
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this.Response.Write(FileObj.getErrMsg);
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}
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}
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}
49![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
第二种方法:用js动态创建form和iframe上传文件,实现无刷新。优点是代码量小,无需客户端安装控件,缺点就是上传有限制大小,下面看代码:
需要文件有:1个前台页面upload.html、
1个js函数 function upFile、 1个处理文件accept.aspx(accept.aspx.cs)
upload.html
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>无标题页</title>
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<mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script>
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</head>
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<body>
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<form id="form1" runat="server">
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<div style="width:100%">
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<iframe name='hidden_frame' id="hidden_frame" style='width:150px; height:50px; display:none;'> </iframe>
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<input type="file" id="hidFilePath" />
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<input id="upBtn" type="button" class="clearBtn" style="display:none;" value="上传图片" onclick="upFile('hidFilePath');" />
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</div>
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</form>
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</body>
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</html>
function upFile
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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function upFile(ob)
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{
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var file = document.getElementById(ob) ;
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var newName = "FileName"; //设置文件保存的名字
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var form=document.createElement('form');
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document.body.appendChild(form);
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form.encoding="multipart/form-data";
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form.method = "post";
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form.action= "accept.aspx?nm=" + newName;
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form.target= "hidden_frame";
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var pos=file.nextSibling; //记住file在旧表单中的的位置
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form.appendChild(file);
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form.submit();
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pos.parentNode.insertBefore(file,pos);
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document.body.removeChild(form);
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}
17![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
accept.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up.aspx.cs" Inherits="Member_up" %>
accept.aspx.cs
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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public partial class Member_up : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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string mz = HttpContext.Current.Request.QueryString["nm"].ToString();
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string uperr = "";
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HttpFileCollection files = HttpContext.Current.Request.Files;
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if (files.Count>0)
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{ uperr = upSingleFile(files[0], mz); }
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else { uperr = "ok"; }
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HttpContext.Current.Session["upInfo"] = uperr;
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Response.Write(uperr);
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}
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//上传文件
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private string upSingleFile(HttpPostedFile file, String theFileName)
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{
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string infos = "";
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bool fileOK = false;
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string fileName, fileExtension ;
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fileName = System.IO.Path.GetFileName(file.FileName);
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if (fileName != "")
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{
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if (file.ContentLength >= 1024 * 1024 * 2)
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{
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infos = "上传文件太大,目前仅支持2M以内的图片上传!";
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}
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else
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{
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fileExtension = System.IO.Path.GetExtension(fileName).ToLower();
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String[] allowedExtensions = { ".jpg", ".jpeg", ".gif", ".bmp", ".png", ".icon" };
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for (int i = 0; i < allowedExtensions.Length; i++)
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{
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if (fileExtension == allowedExtensions[i])
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{
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fileOK = true;
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break;
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}
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}
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if (!fileOK)
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{
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infos = "不支持上传此类型文件!目前支持的图片格式有:jpg|jpeg|gif|bmp|png|icon";
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}
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else
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{
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file.SaveAs(System.Web.HttpContext.Current.Request.MapPath("~/books/BookPic/") + theFileName);
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infos = "ok" + theFileName;
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}
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}
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}
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else
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{
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infos = "没有读取到文件!";
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}
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return infos;
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}
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}