C# extjs 图片、附件以二进制形式存储至数据库，图片显示，附件下载

页面

<ext:FileUpload runat="server" Label="附件" ID="attachment" Width="200px"></ext:FileUpload>
<ext:FileUpload runat="server" Label="照片" ID="photo" Width="200px"></ext:FileUpload>

后台附件添加

if (System.IO.Path.GetExtension(attachment.FileName).ToLower() != null&&System.IO.Path.GetExtension(attachment.FileName).ToLower() != "")
        {
            string attachmentname = System.IO.Path.GetFileName(attachment.FileName);
            string fileAttachment = System.IO.Path.GetExtension(attachment.FileName).ToLower();
            string[] allowAttachment = { ".jpg", ".gif", ".docx", ".pptx", ".txt", ".xsl", ".rar", ".doc", ".zip", ".png", ".jpeg", ".bmp" };
            bool bl = false;
            for (int i = 0; i < allowAttachment.Length; i++)
            {
                if (fileAttachment == allowAttachment[i])
                {
                    bl = true;
                    break;
                }
            }
            if (!bl)
            {
                Alert.ShowInTop("请上传符合格式的附件");
                return;
            }

            int AttachmentLength = attachment.PostedFile.ContentLength; //正文的大小
            Byte[] FileByteArrayAtt = new Byte[AttachmentLength];   //图象文件临时储存Byte数组 
            Stream StreamObjectAtt = attachment.PostedFile.InputStream;      //建立数据流对像 
            //读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度 
            StreamObjectAtt.Read(FileByteArrayAtt, 0, AttachmentLength); //将数组从第0位到数组的长度位数据都读取进StreamObjectAtt
            hrmsfile.Attachment = FileByteArrayAtt;
            hrmsfile.Attachmentformat = attachmentname;
        }//然后将hrmsfile这个new出来的实体存至数据库即可

附件下载页面

      <table><tr>
         <td><strong>附件：</strong></td>
          <td><a href="FuJianXiazhai.ashx?id=<%# Eval("id")%>">
                   <%#Eval("Attachmentformat")%></a></td>
         </tr></table>

FuJianXiaZhai.ashx页面

 string id = context.Request.QueryString["id"];
            HDQY.HDQYMS.Business.MsHrms.Hrms_fileBLL bll = new HDQY.HDQYMS.Business.MsHrms.Hrms_fileBLL();
            HDQY.HDQYMS.Entity.HrmsFile ra = bll.GetHrmsFileByID(id);
            if (ra != null && ra.Attachment != null)
            {

                context.Response.Clear();
                string strFileName = ra.Attachmentformat;
                context.Response.ContentType = "APPLICATION/OCTET-STREAM";
                context.Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(ra.Attachmentformat));
                context.Response.Buffer = true;
                context.Response.BinaryWrite(ra.Attachment);
                context.Response.Flush();
                context.Response.Close();
            }

照片的上传和附件时一样的，显示在前台时页面是：

 <td rowspan="4" style=" 100px;"><img alt="个人照片" height="120px" width="100px" src='Handler.ashx?id=<%# Eval("id")%>'></td>

同样是向一个ashx文件要图片

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string id = context.Request.QueryString["id"];
        if (string.IsNullOrEmpty(id))
        {
            System.IO.FileStream fs = new System.IO.FileStream(System.Web.HttpContext.Current.Server.MapPath("http://www.cnblogs.com/icon/20111130160358207106.png"), System.IO.FileMode.Open, System.IO.FileAccess.Read);
            byte[] image = new byte[fs.Length];
            fs.Read(image, 0, image.Length);
            context.Response.ContentType = "png";//设定输出文件类型
            context.Response.OutputStream.Write(image, 0, image.Length);
            context.Response.End();
            return;
        }
        HDQY.HDQYMS.Business.MsHrms.Hrms_fileBLL bll = new HDQY.HDQYMS.Business.MsHrms.Hrms_fileBLL();
        HDQY.HDQYMS.Entity.HrmsFile hrmsfile = bll.GetHrmsFileByID(id);
        if (hrmsfile != null && hrmsfile.Photo != null && hrmsfile.Photo.Length != 0)
        {
            context.Response.ContentType = hrmsfile.Photoformat;//设定输出文件类型
            context.Response.OutputStream.Write(hrmsfile.Photo, 0, hrmsfile.Photo.Length);
            context.Response.End();
        }
        else
         {
              System.IO.FileStream fs = new System.IO.FileStream(System.Web.HttpContext.Current.Server.MapPath("http://www.cnblogs.com/icon/20111130160358207106.png"), System.IO.FileMode.Open, System.IO.FileAccess.Read);
            byte[] image = new byte[fs.Length];
            fs.Read(image, 0, image.Length);
            context.Response.ContentType = "png";//设定输出文件类型
            context.Response.OutputStream.Write(image, 0, image.Length);
            context.Response.End();
        }//无图片时给了20111130160358207106.png这个默认图片

虽然知道往数据库中存个路径更好一些，但是领导要求就做了，在这里记一下先。