Asp.net动态添加附件上传

代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="ClassifyInfo.WebForm1" %>

<!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>
    <script type="text/javascript">
        function AddAttachments() {
            document.getElementById("attach").innerText = "继续添加附件";
            //tb变量未加var在javascript中代表全局变量
            tb = document.getElementById("attachments");
            var newRow = tb.insertRow();
            newRow.insertCell().innerHTML = "<input type='file' size='50' name='File' />  <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>
    <form id="form1" runat="server"  enctype="multipart/form-data"  method="post">
    <div>
    <table  id="attachments"></table>
    <a id="attach" name="attach" href="javascript:;" 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" onclick="AddAttachments()">添加附件</a>
    <br /><br /><br /><br /><br />
        <asp:Button ID="btnSend" runat="server" Text="上传" onclick="btnSend_Click" />
    </div>
    </form>
</body>
</html>

代码

protected void btnSend_Click(object sender, 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());

        }

代码

<system.web>
        <httpRuntime maxRequestLength="10240" executionTimeout="45" useFullyQualifiedRedirectUrl="true"/>
        
</system.web>

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