附件下载功能

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1、下载链接

  <a href='<%=Request.ApplicationPath%>/CommonPages/RetrieveImageData.aspx?TableName=Knowledge&FieldName=Upload&RowGuid=<%#Eval("RowGuid") %>'>                               下载                            </a>

2、下载功能调用页面：
RetrieveImageData.aspx
前台：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="RetrieveImageData.aspx.cs" Inherits="RongGuangSys.RongGuangTable.CommonPages.RetrieveImageData"   theme="" styleSheetTheme=""%>

3、后台功能实现

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace CommonPages{    public partial class RetrieveImageData : System.Web.UI.Page    {        protected void Page_Load(object sender, System.EventArgs e)        {            Response.Clear();            string TableName = Request.QueryString["TableName"];            string FieldName = Request.QueryString["FieldName"];            string RowGuid = Request.QueryString["RowGuid"];           MisGuidRow oRow = new MisGuidRow(TableName, RowGuid);            if (Request["TempFile"] != null)            {                string fileName = "";                #region 如果采用生成文件的方式，会在服务器的Web程序目录下面创建临时文件，                if (oRow.R_HasFilled && !Convert.IsDBNull(oRow[FieldName]))                {                    if (oRow[FieldName + "_FileName"] != null)                    {                        fileName = oRow[FieldName + "_FileName"].ToString();                    }                    else                    {                        fileName = Guid.NewGuid().ToString();                    }                    //替换开始                    string guid = System.Guid.NewGuid().ToString();                    FileStream objFileStream;                    BinaryWriter objBinaryWriter;                    string attPath = Request.ApplicationPath + "/RongGuangTempFile/" + TableName;                    if (!Directory.Exists(Server.MapPath(attPath)))                    {                        Directory.CreateDirectory(Server.MapPath(attPath));                    }                    string strFullFilePath = Server.MapPath(attPath + "/" + fileName);                    //二进制文件写必须用binaryWrite,不需要制定encoding方式                    if (!File.Exists(strFullFilePath))                    {                        objFileStream = new FileStream(strFullFilePath, FileMode.OpenOrCreate, FileAccess.Write);                        objBinaryWriter = new BinaryWriter(objFileStream);                        objBinaryWriter.Write((byte[])oRow[FieldName]);                        objBinaryWriter.Close();                        objFileStream.Close();                    }                    Response.Redirect(attPath + "/" + fileName);                }                #endregion            }            else            {                if (oRow.R_HasFilled && !Convert.IsDBNull(oRow[FieldName]))                {                    //Response.Charset = "utf-8";                    //Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");//'解决中文乱码之关键                    Response.ContentType = oRow[FieldName + "_ContentType"].ToString();                    if (oRow[FieldName + "_ContentType"].ToString().IndexOf("image/") < 0 && oRow[FieldName + "_FileName"] != null)                    {                        Response.AppendHeader("content-disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(oRow[FieldName + "_FileName"].ToString(), System.Text.Encoding.UTF8));                    }                    Response.BinaryWrite((byte[])oRow[FieldName]);                    Response.End();                }            }        }    }}

这里写图片描述

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