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【asp.net】图片自动上传和显示

来源:中国IT实验室 作者:佚名 发表于:2013-04-19 11:43  点击:
昨天发布了一篇 图片上传和显示 的文章,点击上传按钮后才能上传和显示图片,这样交互性不太好,所以今天研究了下怎么自动上传和显示,其实也不太复杂,就是利用js,效果图如下: 然后下面是主要代码,上传图片和显示的代码还是昨天那些,具体参考图片上传和显
昨天发布了一篇 图片上传和显示 的文章,点击"上传"按钮后才能上传和显示图片,这样交互性不太好,所以今天研究了下怎么自动上传和显示,其实也不太复杂,就是利用js,效果图如下: 
        然后下面是主要代码,上传图片和显示的代码还是昨天那些,具体参考图片上传和显示:
        1.界面代码
        UploadPic.aspx
        <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="UploadPic.aspx.cs" Inherits="Pic_Try.UploadPic" %>
        <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ".w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
        <html xmlns=".w3.org/1999/xhtml">
        <head runat="server">
            <title>图片自动上传和显示</title>
            <link href="css/uploadpic.css" rel="Stylesheet" type="text/css" />
        </head>
        <body>
            <form id="form1" runat="server">
            <div class="pic_image"><asp:Image class="picshow" ID="pic" runat="server" /></div>
            <div>
            <div class="file_div">
            <asp:FileUpload ID="pic_upload" runat="server" ToolTip="选择图片"  onchange="javascript:__doPostBack('lbUploadPhoto','')"/>
            <span id="file_text">选择图片</span>
            </div>
            <asp:LinkButton ID="lbUploadPhoto" runat="server" onclick="lbUploadPhoto_Click"></asp:LinkButton>
            <asp:Label ID="lbl_pic" runat="server" class="pic_text"></asp:Label></div>
            <div class="pic_label">上传图片格式为。jpg, .gif, .bmp,.png,图片大小不得超过8M</div>
            </form>
        </body>
        </html>
        2.后台代码
        UploadPic.aspx.cs
        using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Web;
        using System.Web.UI;
        using System.Web.UI.WebControls;
        using System.IO;
        using System.Security.Cryptography;
        using System.Web.Security;
        namespace Pic_Try
        {
            public partial class UploadPic : System.Web.UI.Page
            {
                protected void Page_Load(object sender, EventArgs e)
                {
                }
                /// <summary>
                /// 控件事件
                /// </summary>
                protected void lbUploadPhoto_Click(object sender, EventArgs e)
                {
                    Boolean fileOk = false;
                    if (pic_upload.HasFile)//验证是否包含文件
                    {
                        //取得文件的扩展名,并转换成小写
                        string fileExtension = Path.GetExtension(pic_upload.FileName)。ToLower();
                        //验证上传文件是否图片格式
                        fileOk = IsImage(fileExtension);
                        if (fileOk)
                        {
                            //对上传文件的大小进行检测,限定文件最大不超过8M
                            if (pic_upload.PostedFile.ContentLength < 8192000)
                            {

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