多页的TIFF图片在aspx页面分页显示_.NET_编程开发_程序员俱乐部

一、逻辑实现：将数据库中的二进制TIFF图片读出并分页显示在页面上。

1.显示界面

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 public FrameDimension MyGuid;
    public static int MyPos = 0;
    public static int totalPage = 0;
    public static MemoryStream stream;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string username = Request.QueryString["username"];
            string sql = string.Format("select top(1) image from Image_Table where image_code=( select new_sjbh from new_ksy_dzpz where new_ksy_dzpzid='{0}' ) ", username);
            DataTable dt = SqlHelper.GetTable(sql);
            if (dt.Rows.Count > 0)
            {
                Image1.ImageUrl = "ShowImage.aspx?username=" + username + "&pagecount=0";
                stream = new MemoryStream((byte[])dt.Rows[0]["image"]);
                // Bitmap bt = new Bitmap(Server.MapPath(Image1.ImageUrl));
                Bitmap bt = new Bitmap(stream);
                Guid gud = (Guid)bt.FrameDimensionsList.GetValue(0);
                FrameDimension fds = new FrameDimension(gud);
                totalPage = bt.GetFrameCount(fds);//获取页数
                this.LabelPageCount.Text = totalPage.ToString();
                this.LabelCurrentPage.Text = "1";
                if (totalPage == 1)
                {
                    this.LinkButtonPreviousPage.Enabled = false;//上一页只读
                    this.LinkButtonFirstPage.Enabled = false;//首页只读
                    this.LinkButtonNextPage.Enabled = false;//下一页只读
                    this.LinkButtonLastPage.Enabled = false;//尾页只读
                    this.btnGo.Enabled = false;

                }
            }
            this.LinkButtonPreviousPage.Enabled = false;//上一页只读
            this.LinkButtonFirstPage.Enabled = false;//首页只读
        }

    }
    //下载
    protected void Button1_Click(object sender, EventArgs e)
    {
        string username = Request.QueryString["username"];
        string sql = string.Format("select top(1) image,name from Image_Table where image_code=( select new_sjbh from new_ksy_dzpz where new_ksy_dzpzid='{0}' ) ", username);
        DataTable dt = SqlHelper.GetTable(sql);
        if (dt.Rows.Count > 0)
        {
            byte[] bytes = (byte[])dt.Rows[0]["image"];
            //下载单个凭证 
            Response.Buffer = true;
            Page.Response.Clear();//清除缓冲区所有内容
            Page.Response.ContentType = "application/octet-stream";
            Page.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(dt.Rows[0]["name"].ToString()) + ".tiff");
            Response.BinaryWrite(bytes);
            Response.Flush();
            Response.End();
        }
    }

    //下一页
    protected void LinkButtonNextPage_Click(object sender, EventArgs e)
    {
        int page = Convert.ToInt32(this.LabelCurrentPage.Text);
        this.LabelCurrentPage.Text = Convert.ToString(page + 1);
        fenyeshow(page);
    }

    //上一页
    protected void LinkButtonPreviousPage_Click(object sender, EventArgs e)
    {
        int page = Convert.ToInt32(this.LabelCurrentPage.Text) - 2;
        this.LabelCurrentPage.Text = Convert.ToString(page + 1);
        fenyeshow(page);
    }
    //首页
    protected void LinkButtonFirstPage_Click(object sender, EventArgs e)
    {
        int page = 0;
        this.LabelCurrentPage.Text = "1";
        fenyeshow(page);
    }
    //尾页
    protected void LinkButtonLastPage_Click(object sender, EventArgs e)
    {
        int page = Convert.ToInt32(this.LabelPageCount.Text) - 1;
        this.LabelCurrentPage.Text = this.LabelPageCount.Text;
        fenyeshow(page);
    }
    //Go
    protected void btnGo_Click(object sender, EventArgs e)
    {
        int page = 0;
        if (this.txtNewPageIndex.Text != "")
        {
            int pagecount = Convert.ToInt32(this.LabelPageCount.Text);
            int txt = Convert.ToInt32(this.txtNewPageIndex.Text);
            if (txt <= pagecount && txt > 0)
            {
                page = Convert.ToInt32(this.txtNewPageIndex.Text) - 1;
                this.LabelCurrentPage.Text = this.txtNewPageIndex.Text;
            }
        }
        if (page == 0)
        {
            this.LabelCurrentPage.Text = "1";
        }
        fenyeshow(page);
    }
//显示页面
    public void fenyeshow(int pagecount)
    {
        string username = Request.QueryString["username"];
        Image1.ImageUrl = "ShowImage.aspx?username=" + username + "&pagecount=" + pagecount.ToString();
        if (this.LabelCurrentPage.Text == "1")
        {
            this.LinkButtonPreviousPage.Enabled = false;//上一页只读
            this.LinkButtonFirstPage.Enabled = false;//首页只读
            this.LinkButtonNextPage.Enabled = true;
            this.LinkButtonLastPage.Enabled = true;
        }
        if (this.LabelCurrentPage.Text == this.LabelPageCount.Text)
        {
            this.LinkButtonNextPage.Enabled = false;//下一页只读
            this.LinkButtonLastPage.Enabled = false;//尾页只读
            this.LinkButtonPreviousPage.Enabled = true;
            this.LinkButtonFirstPage.Enabled = true;
        }
    }

Default.aspx

2.输出界面

 public static MemoryStream stream;
    protected void Page_Load(object sender, EventArgs e)
    {
        string username = Request.QueryString["username"];
        int pagecount =int.Parse(Request.QueryString["pagecount"]);

        string sql = string.Format("select top(1) image from Image_Table where image_code=( select new_sjbh from new_ksy_dzpz where new_ksy_dzpzid='{0}' ) ", username);
        DataTable dt = SqlHelper.GetTable(sql);
        if (dt.Rows.Count>0)
        {
            stream = new MemoryStream((byte[])dt.Rows[0]["image"]);
        }
        if (pagecount >= 0)
        {
            getImage(pagecount.ToString());
        }
   
    }

    void getImage(string pp)//根据路径输出Jpeg格式图片流   
    {
        Bitmap bt = new Bitmap(stream);
        Guid gud = (Guid)bt.FrameDimensionsList.GetValue(0);
        FrameDimension fds = new FrameDimension(gud);

        if (pp != "")
        {

            int qq = Convert.ToInt16(pp);
            bt.SelectActiveFrame(fds, qq);
        }

        MemoryStream ss = new MemoryStream();
        bt.Save(Server.MapPath("1.jpg"));
        bt.Save(ss, ImageFormat.Jpeg);
        byte[] bb = ss.GetBuffer();
        ss.Read(bb, 0, (int)ss.Length);
        //this.ID_img.ImageUrl =Convert.ToString(bb);
        Response.BinaryWrite(bb);
        ss.Close();
        bt.Dispose();
        Response.End();
}

ShowImage.aspx

Tips:会在根目录下生成1.jpg文件，若迁移代码 需删掉1.jpg文件！