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 != null)

        {

            string filePathName = PathHelper.Map(sys.Path.DiskPhoto) + edu_Attach.AttachContent.Replace("/static/upload/image", "").Replace("/", "\\");

            int pos = filePathName.LastIndexOf("\\");

            string fileName = filePathName.Substring(pos + 1);

            string UserAgent = context.Request.ServerVariables["http_user_agent"].ToLower();

            if (UserAgent.IndexOf("firefox") == -1)

            {

                //非火狐浏览器

                context.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(edu_Attach.AttachName));

            }

            else

            {

                context.Response.AddHeader("content-disposition", "attachment;filename=" + 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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