实现对附件的操作.

在html页面中定义附件初始情况

<td style="background:#F3F8FD; border-top-style: none; border-top-color: inherit; border-top- medium;" 
                    class="style1">
                附件：
            </td>
            <td  colspan="3"; style="background:#F3F8FD;795px;padding-left:1px;border-top:none;">
                <asp:Literal ID="attachementLite" runat="server"></asp:Literal>
                <table id="upDiv" border="0" style="margin-bottom: 5px;">
                    <tr>
                        <td>
                            <input type="file" name="upfile" style=" 190px;height:20px;" class="txt" />
                        </td>
                        <td align="right">
                            <span style="padding-left: 2px;">
                                <input type="button" onclick="addFile();" class="btn" name="next" value="增加" style=" 48px;
                                    height: 18px; line-height: 16px;" /></span>
                        </td>
                    </tr>
                </table>
            </td>

后台读取附件表数据,并加载到前台显示

            FileUploadBLL fileUploadBll = new FileUploadBLL();
            IList<Model.FileUpload> attachmentList = fileUploadBll.GetListByEntityId(sysid);//将查询得到的结果集存到IList中
            StringBuilder strAttachment = new StringBuilder();
            if (attachmentList != null)
            {
                foreach (Model.FileUpload fup in attachmentList)//循环Model FileUpload的数据到定义的fup中.
                {
                    strAttachment.Append("<span id="div" + fup.sysId + ""><a href="#" onclick="downLoadFilesel('" + fup.sysId + "')">" + fup.name + "</a>&nbsp;&nbsp;<a style="cursor:pointer" onclick="delFile('" + fup.sysId + "')">删除</a></span><br />");
                }
                if (attachmentList.Count > 0)
                {
                    attachementLite.Text = strAttachment.ToString();
                }
            }

定义对附件的删除,新增附件选框,删除附件选框的js方法

            function delFile(fileId) {
//删除之前将对应的附件项隐藏,表现出删除的效果
//异步删除附件,用ajax,把附件id传到另一个页面,另一个页面的后台接收id,根据id进行删除操作
                var vardiv = "div" + fileId;
                $("#" + vardiv + "").hide();
                $.ajax({
                    type: "POST",
                    url: "../../pact/delFile.aspx?fileId=" + fileId,
                    success: function (msg) {
                    }
                });
            }

            function addFile() {
//通过DOM对象来生成新的附件选框,绑定当前选框的删除按钮
                var num = document.getElementsByName("upfile").length + 1;
                var tb = document.getElementById('upDiv');
                var tr = document.createElement("tr");
                var td = document.createElement("td");

                //var upFile = document.createElement("<input type='file' name='upfile'>");
                var upFile = document.createElement("input");
                upFile.setAttribute("type", "file");
                upFile.setAttribute("name", "upfile");

                //var href = document.createElement("<a style="cursor:pointer" onclick=removeFile(this)></a>");
                var href = document.createElement("a");
                href.setAttribute("onclick", "javascript:removeFile(this)");
                href.innerHTML = "<input type="button" class="btn" name="next" value="删除" style=" 48px;height: 18px; line-height: 16px;" />";

                /*td.insertAdjacentElement('beforeEnd',upFile);
                td.insertAdjacentElement('beforeEnd',href);
                tr.insertAdjacentElement('beforeEnd', td);*/
                
                td.appendChild(upFile);
                td.appendChild(href);
                tr.appendChild(td);

                //tb.childNodes[0].insertAdjacentElement('beforeEnd', tr);
                tb.appendChild(tr);

                if (num >= 9) {
                    //document.getElementById("Remove").style.display="none";
                }

            }
            function removeFile(obj) {
//删除按钮对象的父级对象的父级对象,对于父节点的处理参照
                //document.getElementById('upDiv').childNodes[0].removeChild(obj.parentElement.parentElement);
                document.getElementById('upDiv').removeChild(obj.parentElement.parentElement);
                var num = document.getElementsByName("upfile").length + 1;
                if (num <= 9) {
                    // document.getElementById("Remove").style.display="block";
                }
            }

处理方法

在项目下的一个页面内对js方法中传来的附件id以及其它值进行处理

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using ChengJian.Com.UI;

public partial class pact_delFile : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["fileId"] != null)
        {
            string fileId = Request.QueryString["fileId"].ToString();
            FileUploadUtil.deleteFileUpload(fileId);
            //BaseFunction bFunction = new BaseFunction();
            //bFunction.ExecuteNonQuery("delete from chengjian_FileUpload where sysId = '" + fileId + "'");
        }

    }
}

        /// <summary>
        /// 删除单个附件表
        /// </summary>
        /// <param name="sysId"></param>
        public static void deleteFileUpload(string sysId)
        {
            FileUploadBLL fileUploadBll = new FileUploadBLL();
            Model.FileUpload fup = fileUploadBll.GetModel(sysId);
            if (fup != null)
            {
                string uploadpath = string.Empty;
                uploadpath = ConfigHelper.GetConfigStr("uploadpath");
                uploadpath += fup.path + "/" + fup.uploadName;
                FileInfo file = new FileInfo(uploadpath);
                if (file.Exists)
                {
                    file.Delete(); //删除实际附件
                }

                fileUploadBll.Delete(sysId); //删除表记录
            }
        }

添加好附件之后的保存的写法.

            if (result)
            {
                UploadWebPage sda = new UploadWebPage();
                sda.UploadFile("investments", sysid, SessionInclude.Id);//第一个字符串是附近存放的文件夹.没有该文件夹会自动创建,sysid是附件表的主键id,自己定义,在后面的参数则是添加附件的用户id
                Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('操作成功！');window.location.href ="investmentPlanEdit.aspx?SysId=" + sysid + ""</script>");

            }
            else
            {
                Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('操作失败！');</script>");
            }
对应的BLL

        public void UploadFile(string folder, string entityId, string creatorId)
        {
            UploadFile(null, null, folder, entityId, creatorId);
        }
对应的的DAL

        public void UploadFile(System.Web.HttpRequest request, string dir, string folder, string entityId, string creatorId)
        {
            if (request == null)
            {
                request = Request;
            }

            string inspath = folder + """ + entityId;

            for (int i = 0; i < request.Files.Count; i++)//循环添加附件
            {
                if (request.Files[i].ContentLength > 0)
                {
                    string fileName = System.IO.Path.GetFileName(request.Files[i].FileName);//获得上传附件名.

                    string path = "";
                    if (dir == null || dir == string.Empty)
                    {
                        path = ConfigHelper.GetConfigStr(UPLOADPATH);//设定文件路径
                    }
                    else
                    {
                        path = ConfigHelper.GetConfigStr(dir);
                    }

                    path += folder + "/" + entityId;

                    if (!Directory.Exists(path))
                    {
                        Directory.CreateDirectory(path);
                    }
                    string _path = path + "/" + fileName;
                    string sysId = UUIDGenearte.getUUID();
                    path += "/" + sysId + System.IO.Path.GetExtension(_path);

                    if (File.Exists(path))
                    {
                        File.Delete(path);
                    }

                    request.Files[i].SaveAs(path);

                    fileUpload = new FileUpload();
                    fileUpload.sysId = sysId;
                    fileUpload.entityId = entityId;
                    fileUpload.creatorId = creatorId;
                    fileUpload.uploadType = folder;
                    fileUpload.contentType = request.Files[i].ContentType;
                    fileUpload.fileSize = request.Files[i].ContentLength;
                    fileUpload.name = fileName;
                    fileUpload.path = folder + "/" + entityId;
                    fileUpload.uploadName = fileUpload.sysId + System.IO.Path.GetExtension(_path);
                    fileUpload.createdDate = DateTime.Now;

                    fileUploadBll.Add(fileUpload);//将数据存入附件表中
                }
            }
        }