Jquery DataTables Serverside By Generic Handler in Asp.net

By Unknown - Saturday, September 12, 2015 - No Comments

(Jquery DataTables Serverside Processing By Generic Handler) – Trong các bài viết trước chúng tôi đã giới thiệu các phương thức lấy dữ liệu của Jquery DataTables như: Ajax sourced data, HTML (DOM) sourced data, Server-side by WebServices, Server-side processing. Hôm nay chúng tôi sẽ giới thiệu thêm một phương thức lấy dữ liệu nữa đó là: Serverside By Generic Handler.

- B1: Download CSDL Northwind tại đây và thực hiện công việc Restore Data.

- B2: Tạo stored procedure Pro_Customers_List

Bạn có thể tải về Script bằng cách nhấn vào liên kết tải về dưới đây

- B3: Tạo Project trong Microsoft Visual Studio 2010

Trong Visual Studio tạo 1 Class có tên: Utility và nhập đoạn Code phía dưới cho Class này.

C# Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Data.SqlClient;

using System.Data;

using System.Configuration;

namespace DataTablesServersideByGenericHandler

{

public class SqlDataProvider

{

#region "Membres Prives"

private string _connectionString;

#endregion

#region "Constructeurs"

public SqlDataProvider()

{

try

{

_connectionString = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;

}

catch

{

}

#endregion

#region "Proprietes"

public string ConnectionString

{

get { return _connectionString; }

}

#endregion

#region "Functions"

public DataTable FillTable(string ProcName, params ObjectPara[] Para)

{

try

{

DataTable tb = new DataTable();

SqlDataAdapter adap = new SqlDataAdapter(ProcName, _connectionString);

adap.SelectCommand.CommandType = CommandType.StoredProcedure;

if (Para != null)

{

foreach (ObjectPara p in Para)

{

adap.SelectCommand.Parameters.Add(new SqlParameter(p.Name, p.Value));

}

adap.Fill(tb);

return tb;

}

catch

{

return null;

}

#endregion

}

public class ObjectPara

{

string _name;

object _Value;

public ObjectPara(string Pname, object PValue)

{

_name = Pname;

_Value = PValue;

}

public string Name

{

get { return _name; }

set { _name = value; }

}

public object Value

{

get { return _Value; }

set { _Value = value; }

}

public class Customers

{

public string CustomerID { get; set; }

public string CompanyName { get; set; }

public string ContactName { get; set; }

public string ContactTitle { get; set; }

public string Address { get; set; }

}

VB.NET Code

Imports System.Data.SqlClient

Imports System.Data

Namespace DataTablesServersideByGenericHandler

Public Class SqlDataProvider

#Region "Membres Prives"

Shared _IsError As Boolean = False

Private _connectionString As String

#End Region

#Region "Constructeurs"

Public Sub New()

Try

_connectionString = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString

_IsError = False

Catch ex As Exception

_IsError = True

End Try

End Sub

#End Region

#Region "Proprietes"

Public ReadOnly Property ConnectionString() As String

Get

Return _connectionString

End Get

End Property

#End Region

#Region "Functions"

Public Function FillTable(ByVal ProcName As String, ByVal ParamArray Para() As ObjectPara) As DataTable

Try

Dim tb As New DataTable

Dim adap As New SqlDataAdapter(ProcName, _connectionString)

adap.SelectCommand.CommandType = CommandType.StoredProcedure

If Not Para Is Nothing Then

For Each p As ObjectPara In Para

adap.SelectCommand.Parameters.Add(New SqlParameter(p.Name, p.Value))

End If

adap.Fill(tb)

Return tb

Catch ex As Exception

Return Nothing

End Try

End Function

#End Region

End Class

Public Class ObjectPara

Dim _name As String

Dim _Value As Object

Sub New(ByVal Pname As String, ByVal PValue As Object)

_name = Pname

_Value = PValue

End Sub

Public Property Name() As String

Get

Return _name

End Get

Set(ByVal value As String)

_name = value

End Set

End Property

Public Property Value() As Object

Get

Return _Value

End Get

Set(ByVal value As Object)

_Value = value

End Set

End Property

End Class

Public Class Customers

#Region "Membres Prives"

Private _CustomerID As String

Private _CompanyName As String

Private _ContactName As String

Private _ContactTitle As String

Private _Address As String

#End Region

#Region "Properties"

Public Property CustomerID() As String

Get

Return _CustomerID

End Get

Set(ByVal value As String)

_CustomerID = value

End Set

End Property

Public Property CompanyName() As String

Get

Return _CompanyName

End Get

Set(ByVal value As String)

_CompanyName = value

End Set

End Property

Public Property ContactName() As String

Get

Return _ContactName

End Get

Set(ByVal value As String)

_ContactName = value

End Set

End Property

Public Property ContactTitle() As String

Get

Return _ContactTitle

End Get

Set(ByVal value As String)

_ContactTitle = value

End Set

End Property

Public Property Address() As String

Get

Return _Address

End Get

Set(ByVal value As String)

_Address = value

End Set

End Property

#End Region

End Class

End Namespace

- B4: Mở file Site.Master dạng HTML và bổ xung đoạn mã phía dưới trong thẻ Head

<title>Scrolling and Bootstrap Tabs of DataTables in Asp.net</title>

<asp:ContentPlaceHolder ID="HeadContent" runat="server">

</asp:ContentPlaceHolder>

</head>

- B5: Tạo file Generic Handle và đặt tên thành CustomerDataHandler.ashx

- B6: Viết Code cho file CustomerDataHandler.ashx

C# Code

using Microsoft.VisualBasic;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.Diagnostics;

using System.Web;

using System.Text;

using System.Web.Services;

using System.Web.Script.Serialization;

using System.Configuration;

namespace DataTablesServersideByGenericHandler

{

public class CustomerDataHandler : System.Web.IHttpHandler

{

public void ProcessRequest(HttpContext context)

{

SqlDataProvider objSQL = new SqlDataProvider();

int sortCol = 0;

string sortDir = "";

string Keyword = "";

string OrderByClause = "";

int totalDisplayRecords = 0;

int totalRecords = 0;

int displayLength = 10;

int displayStart = 0;

StringBuilder sb = new StringBuilder();

string cs = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;

List<Customers> ListCustomers = new List<Customers>();

if (context.Request["iDisplayLength"] != null)

{

displayLength = int.Parse(context.Request["iDisplayLength"]);

}

if (context.Request["iDisplayStart"] != null)

{

displayStart = int.Parse(context.Request["iDisplayStart"]);

}

sortDir = context.Request["sSortDir_0"];

sortCol =Convert.ToInt32(context.Request["iSortCol_0"]);

if (context.Request["sSearch"] != null)

{

Keyword = context.Request["sSearch"].Trim();

}

sb.Clear();

for (int i = 0; i <= 10; i++)

{

if (context.Request.Params["bSortable_" + i] == "true")

{

sb.Append(context.Request.Params["iSortCol_" + i]);

sb.Append(" ");

sb.Append(context.Request.Params["sSortDir_" + i]);

}

OrderByClause = sb.ToString();

if (!string.IsNullOrEmpty(OrderByClause))

{

OrderByClause = OrderByClause.Replace("0", ", CustomerID");

OrderByClause = OrderByClause.Replace("1", ", CompanyName");

OrderByClause = OrderByClause.Replace("2", ", ContactName");

OrderByClause = OrderByClause.Replace("3", ", ContactTitle");

OrderByClause = OrderByClause.Replace("4", ", Address");

OrderByClause = OrderByClause.Remove(0, 1);

}

else

{

OrderByClause = "CustomerID ASC";

}

DataTable objBind = objSQL.FillTable("Pro_Customers_List", new ObjectPara("@DisplayStart", displayStart), new ObjectPara("@DisplayLength", displayLength), new ObjectPara("@Keyword", Keyword), new ObjectPara("@SortField", OrderByClause.Trim()));

sb.Clear();

if (objBind != null)

{

foreach (DataRow row in objBind.Rows)

{

if (totalRecords == 0)

{

totalRecords = Int32.Parse(row["TotalRecords"].ToString());

}

if (totalDisplayRecords == 0)

{

totalDisplayRecords = Int32.Parse(row["TotalDisplayRows"].ToString());

}

Customers Customers = new Customers();

Customers.CustomerID = row["CustomerID"].ToString();

Customers.CompanyName = row["CompanyName"].ToString();

Customers.ContactName = row["ContactName"].ToString();

Customers.ContactTitle = row["ContactTitle"].ToString();

Customers.Address = row["Address"].ToString();

ListCustomers.Add(Customers);

}

dynamic result = new

{

iTotalRecords = totalRecords,

iTotalDisplayRecords = totalDisplayRecords,

aaData = ListCustomers

};

JavaScriptSerializer js = new JavaScriptSerializer();

context.Response.Write(js.Serialize(result));

}

public bool IsReusable

{

get { return false; }

}

VB.NET Code

Imports System.Web

Imports System.Web.Services

Imports System.Web.Script.Serialization

Namespace DataTablesServersideByGenericHandler

Public Class CustomerDataHandler

Implements System.Web.IHttpHandler

Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

Dim objSQL As New SqlDataProvider()

Dim sortCol As Integer = 0

Dim sortDir As String = ""

Dim Keyword As String = ""

Dim OrderByClause As String = ""

Dim totalDisplayRecords As Integer = 0

Dim totalRecords As Integer = 0

Dim displayLength As Integer = 10

Dim displayStart As Integer = 0

Dim sb As New StringBuilder()

Dim cs As String = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString

Dim ListCustomers As New List(Of Customers)()

If Not context.Request("iDisplayLength") Is Nothing Then

displayLength = Integer.Parse(context.Request("iDisplayLength"))

End If

If Not context.Request("iDisplayStart") Is Nothing Then

displayStart = Integer.Parse(context.Request("iDisplayStart"))

End If

sortDir = context.Request("sSortDir_0")

sortCol = context.Request("iSortCol_0")

If Not context.Request("sSearch") Is Nothing Then

Keyword = context.Request("sSearch")

End If

sb.Clear()

For i As Integer = 0 To 10

If context.Request.Params("bSortable_" & i) = "true" Then

sb.Append(context.Request.Params("iSortCol_" & i))

sb.Append(" ")

sb.Append(context.Request.Params("sSortDir_" & i))

End If

OrderByClause = sb.ToString()

If Not String.IsNullOrEmpty(OrderByClause) Then

OrderByClause = OrderByClause.Replace("0", ", CustomerID")

OrderByClause = OrderByClause.Replace("1", ", CompanyName")

OrderByClause = OrderByClause.Replace("2", ", ContactName")

OrderByClause = OrderByClause.Replace("3", ", ContactTitle")

OrderByClause = OrderByClause.Replace("4", ", Address")

OrderByClause = OrderByClause.Remove(0, 1)

Else

OrderByClause = "CustomerID ASC"

End If

Dim objBind As DataTable = objSQL.FillTable("Pro_Customers_List", New ObjectPara("@DisplayStart", displayStart), _

New ObjectPara("@DisplayLength", displayLength), _

New ObjectPara("@Keyword", Keyword.Trim), _

New ObjectPara("@SortField", OrderByClause.Trim))

sb.Clear()

If Not objBind Is Nothing Then

For Each row As DataRow In objBind.Rows

If totalRecords = 0 Then

totalRecords = Int32.Parse(row("TotalRecords").ToString())

End If

If totalDisplayRecords = 0 Then

totalDisplayRecords = Int32.Parse(row("TotalDisplayRows").ToString())

End If

Dim Customers As New Customers()

With Customers

.CustomerID = row("CustomerID").ToString()

.CompanyName = row("CompanyName").ToString()

.ContactName = row("ContactName").ToString()

.ContactTitle = row("ContactTitle").ToString()

.Address = row("Address").ToString()

End With

ListCustomers.Add(Customers)

End If

Dim result = New With { _

Key .iTotalRecords = totalRecords, _

Key .iTotalDisplayRecords = totalDisplayRecords, _

Key .aaData = ListCustomers _

}

Dim js As New JavaScriptSerializer()

context.Response.Write(js.Serialize(result))

End Sub

ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable

Get

Return False

End Get

End Property

End Class

End Namespace

- B7: Mở file Default.aspx dưới dạng HTML và nhập mã HTML

<%@ Page Title="Jquery DataTables Serverside By Generic Handler in Asp.net" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="DataTablesServersideByGenericHandler._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

</asp:Content>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<h3>Jquery DataTables Serverside By Generic Handler in Asp.net</h3>

</div>

<thead>

<tr>

<th align="center">CustomerID</th>

<th align="center">CompanyName</th>

<th align="center">ContactName</th>

<th align="center">ContactTitle</th>

<th align="center">Address</th>

</tr>

</thead>

</table>

</div>

function pageLoad() {

$('#tblData').DataTable({

columns: [

{ 'data': 'CustomerID' },

{ 'data': 'CompanyName' },

{ 'data': 'ContactName' },

{ 'data': 'ContactTitle' },

{ 'data': 'Address' }

"sPaginationType": "full_numbers",

serverSide: true,

sAjaxSource: 'CustomerDataHandler.ashx',

sServerMethod: 'post'

});

};

</script>

</asp:Content>

Chúc các bạn thành công!

Quang Bình

News Ticker