文件下载功能

代码如下：

/// <summary>
/// 附件下载
</summary>
<param name="attachId">附件ID</param>
public void DownloadAttach(int attachId)
{
    Edu_Attach edu_Attach = edu_AttachService.findById<Edu_Attach>(attachId);
    if (edu_Attach != null)
    {
        HttpContext context = (HttpContext)ctx.web.Context;
        if (context != )
        {
            string filePathName = PathHelper.Map(sys.Path.diskPhoto) + edu_Attach.AttachContent.Replace("/static/upload/image","").Replace(/\\");
            int pos = filePathName.LastIndexOf(string fileName = filePathName.Substring(pos + 1string UserAgent = context.Request.ServerVariables[http_user_agent].ToLower();
            if (UserAgent.IndexOf(firefox") == -)
            {
                //非火狐浏览器
                context.response.addheader(content-dispositionattachment;filename=" + HttpUtility.UrlEncode(edu_Attach.AttachName));
            }
            else
            {
                context.response.addheader( edu_Attach.AttachName);
            }
            FileStream fs = new FileStream(filePathName,FileMode.Open,FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr,0,bArr.Length);
            fs.Close();
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.BinaryWrite(bArr);
            context.Response.Flush();
            context.Response.End();
        }
    }
}

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