Hi jovceka,
Check this example. Now please take its reference and correct your code.
For this example i have used table named tblFiles whose schema is defined as follows.
For save record in databse refer below article.
HTML
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.7/css/jquery.dataTables.min.css" />
<script type="text/javascript" src="https://cdn.datatables.net/1.10.7/js/jquery.dataTables.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$.ajax({
url: '<%= Page.ResolveUrl("~/WebService.asmx/GetFiles")%>',
method: 'post',
dataType: 'json',
success: function (data) {
$('#datatable').dataTable({
paging: true,
sort: true,
pageLength: 3,
searching: true,
data: data,
columns: [
{ 'data': 'Id' },
{ 'data': 'Name' },
{
'data': 'Data',
'sortable': false,
'searchable': false,
'render': function (Data) {
if (!Data) {
return 'N/A';
} else {
var img = 'data:image/png;base64,' + Data;
return '<img src="' + img + '" height="50px" width="50px" />';
}
}
}
]
});
}, error: function (response) {
alert(response.responseText);
}
});
});
</script>
<div style="width: 100%; border: 1px solid black; padding: 3px">
<table id="datatable">
<thead>
<tr>
<th>Id</th>
<th>Name</th>
<th>Image</th>
</tr>
</thead>
<tfoot>
<tr>
<th>Id</th>
<th>Name</th>
<th>Image</th>
</tr>
</tfoot>
</table>
</div>
WebService
C#
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Script.Serialization;
using System.Web.Services;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{
public class File
{
public int Id { get; set; }
public string Name { get; set; }
public string Data { get; set; }
}
[WebMethod]
public void GetFiles()
{
string cs = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
List<File> files = new List<File>();
using (SqlConnection con = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand("SELECT id,Name,Data FROM tblFiles WHERE ContentType = 'image/jpeg'", con);
cmd.CommandType = CommandType.Text;
con.Open();
SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
File file = new File();
file.Id = Convert.ToInt32(rdr["id"]);
file.Name = rdr["Name"].ToString();
file.Data = Convert.ToBase64String((byte[])rdr["Data"]);
files.Add(file);
}
}
JavaScriptSerializer js = new JavaScriptSerializer();
Context.Response.Write(js.Serialize(files));
}
}
VB.Net
Imports System.Web
Imports System.Collections.Generic
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Script.Serialization
Imports System.Web.Services
Imports System.Web.Services.Protocols
' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
<System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class WebService
Inherits System.Web.Services.WebService
Public Class File
Public Property Id As Integer
Public Property Name As String
Public Property Data As String
End Class
<WebMethod()> _
Public Sub GetFiles()
Dim cs As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Dim files As List(Of File) = New List(Of File)()
Using con As SqlConnection = New SqlConnection(cs)
Dim cmd As SqlCommand = New SqlCommand("SELECT id,Name,Data FROM tblFiles WHERE ContentType = 'image/jpeg'", con)
cmd.CommandType = CommandType.Text
con.Open()
Dim rdr As SqlDataReader = cmd.ExecuteReader()
While rdr.Read()
Dim file As File = New File()
file.Id = Convert.ToInt32(rdr("id"))
file.Name = rdr("Name").ToString()
file.Data = Convert.ToBase64String(CType(rdr("Data"), Byte()))
files.Add(file)
End While
End Using
Dim js As JavaScriptSerializer = New JavaScriptSerializer()
Context.Response.Write(js.Serialize(files))
End Sub
End Class
Screenshot
