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">
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$.xpost(jthis.attr('action'), postdata, function(code, message) {
if(code == 0) {
location.reload();
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$.alert(message);
jsubmit.button('reset');
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return false;
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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>
