ASP.NET MVC自定义ActionResult实现文件压缩

有时候需要将单个或多个文件进行压缩打包后在进行下载，这里我自定义了一个ActionResult，方便进行文件下载

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using WebSeat.Site.Member.Helper;

namespace WebSeat.Site.Member.CustomResult
{
    /// <summary>
    /// 说明:压缩文件
    /// 创建日期：2016/12/14 16:18:22
    /// 创建人：曹永承
    /// </summary>
    public class ZipResult : ActionResult
    {
        #region 字段

        private Ionic.Zip.ZipFile zip;
        #endregion

        #region 属性
        /// <summary>
        /// 文档类型
        /// </summary>
        public string ContentType
        {
            get;set;
        }
        /// <summary>
        /// 下载文件名称
        /// </summary>
        public string DownloadName { get; set; }
        #endregion

        #region 构造函数
        public ZipResult(string downLoadName =null)
        {
            ContentType = "application/x-zip-compressed";
            DownloadName = downLoadName;
            zip = new Ionic.Zip.ZipFile(System.Text.Encoding.UTF8);
        }

        public ZipResult(params string[] filenames):this()
        {
            foreach (string filename in filenames)
            {
                zip.AddFile(filename);
            }
        }

        public ZipResult(IDictionary<string,Stream> dir, string downLoadName = " ")
            : this(downLoadName)
        {
            foreach (string key in dir.Keys)
            {
                zip.AddEntry(key, dir[key]);
            }
        }
        #endregion

        #region 公共方法
        /// <summary>
        /// 添加文件
        /// </summary>
        /// <param name="filename"></param>
        public void AddFile(string filename)
        {
            zip.AddFile(filename);
        }

        /// <summary>
        /// 添加流
        /// </summary>
        /// <param name="entryName"></param>
        /// <param name="stream"></param>
        public void AddEntry(string entryName, Stream stream)
        {
            zip.AddEntry(entryName, stream);
        }

        /// <summary>
        /// 获取压缩后的流
        /// </summary>
        /// <returns></returns>
        public Stream GetStream()
        {
            Stream stream = new MemoryStream();
            zip.Save(stream);
            return stream;
        }

        #endregion

        #region 实现ExecuteResult方法
        public override void ExecuteResult(ControllerContext context)
        {
            context.HttpContext.Response.ContentType = ContentType;
            string filename = DateTime.Now.ToString("yyyy_MM_dd_HH_mm_ss")+".zip";
            filename = DownloadName == null ? filename : DownloadName;

            //对文件名称进行编码，避免下载文件名称出现乱码
            filename = filename.EncodingDownloadFileName();
            context.HttpContext.Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
            Stream ms = GetStream();
            context.HttpContext.Response.AddHeader("Content-Length", ms.Length.ToString());
            ms.Seek(, SeekOrigin.Begin);
            byte[] bytes = new byte[ * ];
            int readSize = ;
            var output = context.HttpContext.Response.OutputStream;
            while ((readSize = ms.Read(bytes, , bytes.Length)) > )
            {
                output.Write(bytes, , readSize);
                context.HttpContext.Response.Flush();
            }
        }
        #endregion

    }
}