Show images from the database using DataGrid

zhaozj2021-02-16  90

Foreword How do we create a DataGrid column that displays images obtained from the database? This is a question that is often asked about the DataGrid control, and others can easily answer the knowledge about the template columns on the template column and a little bit of HTTP Handler. The following uses the Northwind database's Employees table to display images in the database in a DataGrid.

Code - bindimg.aspx <% @ page language = "c #" codebehind = "bindimg.aspx.cs" autoeventwireup = "false" inherits = "showimg.bindimg"%> BindImg < / title> </ head> <body> <form id = "form1" method = "post" runat = "server"> <font face = "Song"> <ask: DataGrid ID = "MyDataGrid" runat = "server" AutoGenerateColumns = "False" Width = "632px"> <AlternatingItemStyle BackColor = "Beige"> </ AlternatingItemStyle> <HeaderStyle HorizontalAlign = "Center"> </ HeaderStyle> <Columns> <asp: TemplateColumn HeaderText = "Photo"> <ItemTemplate > <Img src = '<% # "getimg.ashx? Id =" DataBinder.eval ("EmployeeID")%>'> </ itemtemplate> <asp: templateColumn> <ask: boundcolumn datafield = "LastName" HeaderText = "Last Name"> </ asp: BoundColumn> <asp: BoundColumn DataField = "FirstName" HeaderText = "First Name"> </ asp: BoundColumn> <asp: BoundColumn DataField = "title" HeaderText = " Title> </ asp: boundcolumn> </ columns> </ ask: DataGrid> </ font> </ form> </ body> </ html> --- Bindimg.aspx.cs using system; use system.data; using system.drawing; using system.data.sqlclient; summory designs for Namespace showimg {//////////// BindIMG.</p> <p>/// </ summary> public class BindImg: System.Web.UI.Page {protected System.Web.UI.WebControls.DataGrid MyDataGrid; private void Page_Load (object sender, System.EventArgs e) {// Here placed User code with initialization page if (! Page.ispostback) {sqlconnection conn = new sqlconnection (@ "server = shoutor / mydb; database = northwind; uid = sa; pwd = shoutor"; try {conn.open (); SQLCommand cmd = new SqlCommand ( "select employeeID, lastname, firstname, title from employees", conn); SqlDataReader reader = cmd.ExecuteReader (); MyDataGrid.DataSource = reader; MyDataGrid.DataBind ();} finally {conn.Close () }}} #Region Web Form Designer Generated Code Override Protected Void OnNit (Eventargs E) {// // Codegen: This call is necessary for the ASP.NET Web Form Designer. // InitializeComponent (); base.onit (e);} /// <summary> /// Designer Supports the required method - Do not use the code editor to modify the // / this method. /// </ summary> private () {this.load = new system.eventhandler (this.page_load);} #ENDREGON}} - GetImg.ashx <% @ WebHandler Language = "C #" Class = "ShowImg.GetImg"%> --- GetImg.aspx.cs using System; using System.Web; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Drawing.Imaging; using System. A summary description of the IO; Namespace Showimg {/// <summary> /// GetImg.</p></div><div class="text-center mt-3 text-grey"> 转载请注明原文地址:https://www.9cbs.com/read-12945.html</div><div class="plugin d-flex justify-content-center mt-3"></div><hr><div class="row"><div class="col-lg-12 text-muted mt-2"><i class="icon-tags mr-2"></i><span class="badge border border-secondary mr-2"><h2 class="h6 mb-0 small"><a class="text-secondary" href="tag-2.html">9cbs</a></h2></span></div></div></div></div><div class="card card-postlist border-white shadow"><div class="card-body"><div class="card-title"><div class="d-flex justify-content-between"><div><b>New Post</b>(<span class="posts">0</span>) </div><div></div></div></div><ul class="postlist list-unstyled"> </ul></div></div><div class="d-none threadlist"><input type="checkbox" name="modtid" value="12945" checked /></div></div></div></div></div><footer class="text-muted small bg-dark py-4 mt-3" id="footer"><div class="container"><div class="row"><div class="col">CopyRight © 2020 All Rights Reserved </div><div class="col text-right">Processed: <b>0.042</b>, SQL: <b>9</b></div></div></div></footer><script src="./lang/en-us/lang.js?2.2.0"></script><script src="view/js/jquery.min.js?2.2.0"></script><script src="view/js/popper.min.js?2.2.0"></script><script src="view/js/bootstrap.min.js?2.2.0"></script><script src="view/js/xiuno.js?2.2.0"></script><script src="view/js/bootstrap-plugin.js?2.2.0"></script><script src="view/js/async.min.js?2.2.0"></script><script src="view/js/form.js?2.2.0"></script><script> var debug = DEBUG = 0; var url_rewrite_on = 1; var url_path = './'; var forumarr = {"1":"Tech"}; var fid = 1; var uid = 0; var gid = 0; xn.options.water_image_url = 'view/img/water-small.png'; </script><script src="view/js/wellcms.js?2.2.0"></script><a class="scroll-to-top rounded" href="javascript:void(0);"><i class="icon-angle-up"></i></a><a class="scroll-to-bottom rounded" href="javascript:void(0);" style="display: inline;"><i class="icon-angle-down"></i></a></body></html><script> var forum_url = 'list-1.html'; var safe_token = 'WfUR8YmEbZrsqJvXqBWVQsLdMdvJlYSg5iMnG9Dy2FosjWULS9wgFoBFrnn9SfghDBSEWDqDkubbAPDf9yJIOA_3D_3D'; var body = $('body'); body.on('submit', '#form', function() { var jthis = $(this); var jsubmit = jthis.find('#submit'); jthis.reset(); jsubmit.button('loading'); var postdata = jthis.serializeObject(); $.xpost(jthis.attr('action'), postdata, function(code, message) { if(code == 0) { location.reload(); } else { $.alert(message); jsubmit.button('reset'); } }); return false; }); function resize_image() { var jmessagelist = $('div.message'); var first_width = jmessagelist.width(); jmessagelist.each(function() { var jdiv = $(this); var maxwidth = jdiv.attr('isfirst') ? first_width : jdiv.width(); var jmessage_width = Math.min(jdiv.width(), maxwidth); jdiv.find('img, embed, iframe, video').each(function() { var jimg = $(this); var img_width = this.org_width; var img_height = this.org_height; if(!img_width) { var img_width = jimg.attr('width'); var img_height = jimg.attr('height'); this.org_width = img_width; this.org_height = img_height; } if(img_width > jmessage_width) { if(this.tagName == 'IMG') { jimg.width(jmessage_width); jimg.css('height', 'auto'); jimg.css('cursor', 'pointer'); jimg.on('click', function() { }); } else { jimg.width(jmessage_width); var height = (img_height / img_width) * jimg.width(); jimg.height(height); } } }); }); } function resize_table() { $('div.message').each(function() { var jdiv = $(this); jdiv.find('table').addClass('table').wrap('<div class="table-responsive"></div>'); }); } $(function() { resize_image(); resize_table(); $(window).on('resize', resize_image); }); var jmessage = $('#message'); jmessage.on('focus', function() {if(jmessage.t) { clearTimeout(jmessage.t); jmessage.t = null; } jmessage.css('height', '6rem'); }); jmessage.on('blur', function() {jmessage.t = setTimeout(function() { jmessage.css('height', '2.5rem');}, 1000); }); $('#nav li[data-active="fid-1"]').addClass('active'); </script>