asp.net实现大文件上传

需要下载NeatUpload插件

上传页面：

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

<%@ Register Assembly="Brettle.Web.NeatUpload" Namespace="Brettle.Web.NeatUpload"
    TagPrefix="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></title>
     <link href="easyui/themes/default/easyui.css" rel="stylesheet" type="text/css" />
    <link href="easyui/themes/icon.css" rel="stylesheet" type="text/css" />
    <script src="easyui/jquery.min.js" type="text/javascript"></script>
    <script src="easyui/jquery.easyui.min.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
    <div class="easyui-panel" style="padding:5px;">
        <Upload:ProgressBar ID="ProgressBar1" runat='server'>
        </Upload:ProgressBar>
      <br />
    <Upload:InputFile ID="AttachFile" runat="server" />
    <br />
    <br />
    <asp:LinkButton ID="BtnUP" runat="server" class="easyui-linkbutton" data-options="iconCls:'icon-add'" onclick="BtnUP_Click">上 传</asp:LinkButton><br /><br />
    <a href="Down.aspx">查看下载</a>
    </div>
    </form>
</body>
</html>

后台源码：

protected void BtnUP_Click(object sender, EventArgs e)
    {
        if (AttachFile.HasFile)
        {
            string FileName = this.AttachFile.FileName;//获取上传文件的文件名,包括后缀
            string ExtenName = System.IO.Path.GetExtension(FileName);//获取扩展名
            string SaveFileName = System.IO.Path.Combine(System.Web.HttpContext.Current.Request.MapPath("UpLoads/"), DateTime.Now.ToLongDateString().ToString() + "-" + FileName);//合并两个路径为上传到服务器上的全路径
            AttachFile.MoveTo(SaveFileName, Brettle.Web.NeatUpload.MoveToOptions.Overwrite);
            string url = "UpLoads/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ExtenName; //文件保存的路径
            float FileSize = (float)System.Math.Round((float)AttachFile.ContentLength / 1024000, 1); //获取文件大小并保留小数点后一位,单位是M
            Response.Write("<script>alert('恭喜您，上传成功!')</script>");
        }
        else
        {
            Response.Write("<script>alert('请选择文件！')</script>");
        }
    }

这里直接获取上传文件夹文件名称提供下载

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

<!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></title>
    <link href="easyui/themes/default/easyui.css" rel="stylesheet" type="text/css" />
    <link href="easyui/themes/icon.css" rel="stylesheet" type="text/css" />
    <script src="easyui/jquery.min.js" type="text/javascript"></script>
    <script src="easyui/jquery.easyui.min.js" type="text/javascript"></script>
    <style type="text/css">
        .div_style  ul li
        {
             list-style-type: decimal;
             border-bottom:1px dashed #E3E3E3;
             margin-bottom:5px;
        }
        .div_style ul li a
        {
            text-decoration: none;
            cursor: pointer;
            font-size: 16px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div class="div_style easyui-panel" style="padding: 5px;">
    <a href="index.aspx">上传文件</a>
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
        <ul  id="www_zzjs_net">
            <%if (files.Length == 0) { Label1.Text = "暂无文件"; }
              else
              {

                  foreach (System.IO.FileInfo item in files)
                  {%>
            <li><a href="Default2.aspx?1=<%=item%>">
                <%=item %></a> &nbsp;&nbsp; &nbsp;<a href="delete.aspx?1=<%=item%>" onclick="javascript:return confirm('确定删除吗？');" >删除附件</a>
            </li>
            <% }
          }%>
        </ul>
    </div>
    <div id="changpage"></div>
    <%--js分页--%>
<%--<script language="javascript">
    var obj, j;
    var page = 0;
    var nowPage = 0; //当前页
    var listNum = 25; //每页显示<ul>数
    var PagesLen; //总页数
    var PageNum = 4; //分页链接接数(5个)
    onload = function () {
        obj = document.getElementById("www_zzjs_net").getElementsByTagName("li");
        j = obj.length
        PagesLen = Math.ceil(j / listNum);
        upPage(0)
    }
    function upPage(p) {
        nowPage = p
        //内容变换
        for (var i = 0; i < j; i++) {
            obj[i].style.display = "none"
        }
        for (var i = p * listNum; i < (p + 1) * listNum; i++) {
            if (obj[i]) obj[i].style.display = "block"
        } //欢迎来到站长特效网，我们的网址是www.zzjs.net，很好记，zz站长，js就是js特效，本站收集大量高质量js代码，还有许多广告代码下载。
        //分页链接变换
        strS = '<a href="###" onclick="upPage(0)">首页</a>  '
        var PageNum_2 = PageNum % 2 == 0 ? Math.ceil(PageNum / 2) + 1 : Math.ceil(PageNum / 2)
        var PageNum_3 = PageNum % 2 == 0 ? Math.ceil(PageNum / 2) : Math.ceil(PageNum / 2) + 1
        var strC = "", startPage, endPage;
        if (PageNum >= PagesLen) { startPage = 0; endPage = PagesLen - 1 }
        else if (nowPage < PageNum_2) { startPage = 0; endPage = PagesLen - 1 > PageNum ? PageNum : PagesLen - 1 } //首页
        else { startPage = nowPage + PageNum_3 >= PagesLen ? PagesLen - PageNum - 1 : nowPage - PageNum_2 + 1; var t = startPage + PageNum; endPage = t > PagesLen ? PagesLen - 1 : t }
        for (var i = startPage; i <= endPage; i++) {
            if (i == nowPage) strC += '<a href="###" style="color:red;font-weight:700;" onclick="upPage(' + i + ')">' + (i + 1) + '</a> '
            else strC += '<a href="###" onclick="upPage(' + i + ')">' + (i + 1) + '</a> '
        } //欢迎来到站长特效网，我们的网址是www.zzjs.net，很好记，zz站长，js就是js特效，本站收集大量高质量js代码，还有许多广告代码下载。
        strE = ' <a href="###" onclick="upPage(' + (PagesLen - 1) + ')">尾页</a>  '
        strE2 = nowPage + 1 + "/" + PagesLen + "页" + "  共" + j + "条"
        document.getElementById("changpage").innerHTML = strS + strC + strE + strE2
    }
</script>--%>
    </form>
</body>
</html>

//下面是后台代码

public FileInfo[] files { set; get; }
protected void Page_Load(object sender, EventArgs e)
{
string dirPath = HttpContext.Current.Server.MapPath("~/UpLoads");
if (Directory.Exists(dirPath))
{
DirectoryInfo dir = new DirectoryInfo(dirPath);
files = dir.GetFiles("*.*");
}
if (files.Length == 0) { Label1.Text = "暂无文件"; }
}

//这是新建另一个页面提供下载的代码

if (Request.QueryString["1"] != null)
{

Response.AddHeader("Content-Disposition", "attachment;filename=" + _filename);
Response.ContentType = "application/unknow";
Response.TransmitFile(_filepath);
Response.End();
}
}

//这是新建另一个页面提供删除操作（后台）

string _filename = Request.QueryString["1"].ToString(), _filepath = System.IO.Path.Combine(MapPath("~/UpLoads"), _filename);
if (System.IO.File.Exists(_filepath))
{
File.Delete(_filepath);
Response.Write("<script language=javascript>alert('删除成功！');window.location = 'Down.aspx';</script>");
//Response.Redirect("Down.aspx");
}

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原文地址：https://www.cnblogs.com/hyyweb/p/5141055.html