(Cách tạo Columns động trong Gridview) – Việc tạo Columns động trong Gridview không những giúp người lập trình phát triển ứng dụng nhanh mà còn giúp việc chỉnh sửa khi có yêu cầu của khách hàng thuận lợi và dễ dàng. Chỉ cần thiết lập lại thông tin các cột cần hiển thị như: Tên, độ rộng, thứ tự, căn chỉnh, định dạng… là đã có thể hoàn thành yêu cầu mà hoàn toàn không phải chỉnh sửa lại mã nguồn. Có nhiều cách để lưu trữ thông tin cột sẽ hiển thị lên Gridview như: file XML, Table trong SQL… Bài viết dưới đây sẽ hướng dẫn các bạn cách tạo Columns động, lưu trữ thông tin cột hiển thị bằng file XML. Mỗi khi cần hiển thị thêm hoặc bỏ bớt cột trên Gridview thì chỉ cần chỉnh sửa lại file XML là xong.
- B1: Tạo CSDL Customers trong SQL Server
STT | Tên trường | Kiểu trường | Ghi chú |
1 | AccountID | Int | Trường tự tăng |
2 | AccountCode | nvarchar(25) | |
3 | AccName | nvarchar(250) | |
4 | AccAddress | nvarchar(250) | |
5 | AccPhone | nvarchar(50) | |
6 | AccFAX | nvarchar(50) | |
7 | AccEmail | nvarchar(50) | |
8 | AccWebsite | nvarchar(150) | |
9 | AccDesc | nvarchar(1500) | |
10 | CreatedDate | datetime | |
11 | ModifiedDate | datetime |
- B3: Nhập dữ liệu cho bảng Accounts
- B4: Tạo stored procedure trong SQL Server
USE[Customers]
GO
CREATE PROCEDURE [dbo].[Pro_Accounts_List]
@Keyword nvarchar(250),
@SortField nvarchar(50),
@SortType nvarchar(10)
AS
declare@strSQL nvarchar(1000)
declare @strWhere nvarchar(500)
declare @strOrder nvarchar (50)
set @strSQL= 'Select * from Accounts'
set @strWhere =' Where 1=1 '
if @Keyword<>''
set @strWhere= @strWhere +' And (AccountCode like N''%' +@Keyword+'%''
Or AccName like N''%' +@Keyword+'%'' Or AccAddress like N''%' +@Keyword+'%''
Or AccPhone like N''%' +@Keyword+'%'' Or AccFAX like N''%' +@Keyword+'%''
Or AccEmail like N''%' +@Keyword+'%'' Or AccWebsite like N''%' +@Keyword+'%'')'
if @SortField='CreatedDate'
Begin
set @strOrder =' Order by CreatedDate'
End
Else
Begin
set @strOrder =' Order by AccName'
End
set @strSQL=@strSQL+@strWhere+@strOrder
print @strSQL
exec sp_executesql @strSQL
Go
- B5: 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.
Imports System.Data.SqlClient
Imports System.Data
Namespace DynamicallyColumnsGridView
Public Class SqlDataProvider
#Region "Membres Prives"
Shared _IsError As Boolean = False
Private _connectionString AsString
#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() AsString
Get
Return _connectionString
End Get
End Property
#End Region
#Region "Functions"
Public FunctionFillTable(ByVal ProcName As String, ByVal ParamArrayPara() As ObjectPara) As DataTable
Try
Dim tb AsNew DataTable
Dim adap AsNew SqlDataAdapter(ProcName, _connectionString)
adap.SelectCommand.CommandType = CommandType.StoredProcedure
If NotPara Is NothingThen
For Eachp As ObjectParaIn Para
adap.SelectCommand.Parameters.Add(New SqlParameter(p.Name, p.Value))
Next
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 PropertyName() As String
Get
Return _name
End Get
Set(ByVal value As String)
_name = value
End Set
End Property
Public PropertyValue() As Object
Get
Return _Value
End Get
Set(ByVal value As Object)
_Value = value
End Set
End Property
End Class
Public Class GridViewColumnTemplate
Public SubAddBoundColumn(ByVal grvObject As GridView, ByVal Title As String, ByValDataField As String, ByVal Align As String, ByVal Format As String)
Dim objBoundColumn AsSystem.Web.UI.WebControls.BoundField
objBoundColumn = NewSystem.Web.UI.WebControls.BoundField
With objBoundColumn
.DataField = DataField
If Format <> "" Then
.DataFormatString = Format
End If
.HeaderText = Title
Select CaseAlign.ToLower
Case "left"
.ItemStyle.HorizontalAlign = HorizontalAlign.Left
Case"right"
.ItemStyle.HorizontalAlign = HorizontalAlign.Right
Case "center"
.ItemStyle.HorizontalAlign = HorizontalAlign.Center
End Select
End With
objBoundColumn.HeaderStyle.CssClass = Title.Replace("[L]", "") & "Header"
objBoundColumn.ItemStyle.CssClass = Title.Replace("[L]", "") & "Cell"
grvObject.Columns.Add(objBoundColumn)
End Sub
End Class
End Namespace
Chú ý: Thuộc tính SiteSqlServer chính là chuỗi Connect với SQL Server trong file Web.Config
- B6: Tạo File XML DynamicallyColumns.xml có cấu trúc phía dưới và đặt file trong thư mục App_Data
- B7: Nhập dữ liệu cho File XML DynamicallyColumn
<?xml version="1.0" standalone="yes"?>
<root>
<items>
<ColumnName>AccountCode</ColumnName>
<ColumnTitle>Account Code</ColumnTitle>
<Alignment>left</Alignment>
<Format></Format>
</items>
<items>
<ColumnName>AccName</ColumnName>
<ColumnTitle>Account Name</ColumnTitle>
<Alignment>left</Alignment>
<Format></Format>
</items>
<items>
<ColumnName>AccAddress</ColumnName>
<ColumnTitle>Address</ColumnTitle>
<Alignment>left</Alignment>
<Format></Format>
</items>
<items>
<ColumnName>AccPhone</ColumnName>
<ColumnTitle>Phone</ColumnTitle>
<Alignment>left</Alignment>
<Format></Format>
</items>
<items>
<ColumnName>AccEmail</ColumnName>
<ColumnTitle>Email</ColumnTitle>
<Alignment>left</Alignment>
<Format></Format>
</items>
<items>
<ColumnName>CreatedDate</ColumnName>
<ColumnTitle>CreatedDate</ColumnTitle>
<Alignment>center</Alignment>
<Format>{0:dd/dd/yyyy}</Format>
</items>
</root>
- B8: Mở file Default.aspxdưới dạng HTML và nhập mã HTML
<%@ PageTitle="Dynamically add BoundField and TemplateField Columns to GridView in ASP.Net" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"EnableEventValidation="false" CodeBehind="Default.aspx.vb" Inherits="DynamicallyColumnsGridView._Default" %>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:ScriptManager ID="ScriptManager1"runat="server">
</asp:ScriptManager>
<h3>
Dynamically add Columns to GridView in ASP.Net
</h3>
<asp:UpdatePanel ID="updatePanel"runat="server"UpdateMode="Conditional">
<ContentTemplate>
<table cellpadding="2"cellspacing="3"width="100%">
<tr>
<td>
</td>
<tdalign="right">
<asp:Label ID="plKeyword" runat="server" Text="Keyword"></asp:Label>
<asp:TextBox ID="txtSearch" CssClass="form-control" ToolTip="Enter Keyword" runat="server" width="200px"></asp:TextBox>
<asp:ImageButton ID="cmdQuickSearch" runat="server" causesvalidation="false" imageurl="~/images/icon_search.gif"></asp:ImageButton>
</td>
</tr>
<trid="trMessage"runat="server"visible="false">
<tdcolspan="2">
<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>
</td>
</tr>
<tr>
<tdcolspan="2">
<asp:GridView ID="grvObject" runat="server"
CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"
BorderWidth="1"AutoGenerateColumns="false"width="100%">
<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>
<HeaderStyle CssClass="GridStyle_HeaderStyle"/>
<RowStyle CssClass="GridStyle_RowStyle"/>
<pagerstyle cssclass="GridStyle_pagination"/>
</asp:GridView>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
- B9: Viết Code cho file Default.aspx
'Visit http://thuthuatlaptrinh.blogspot.com for more ASP.NET Tutorials
Imports System.Data.SqlClient
Namespace DynamicallyColumnsGridView
Public Class _Default
Inherits System.Web.UI.Page
#Region "Private Members"
Private oColumnTemplate AsNew GridViewColumnTemplate
#End Region
#Region "ColumnSettings"
Private FunctionBindColumnSettings() As DataSet
Dim objBind As DataSet = New DataSet()
'Caching
If Cache("Cache_DynamicColumns") Is Nothing Then
objBind.ReadXml(Server.MapPath("App_Data\DynamicallyColumns.xml"))
Cache("Cache_DynamicColumns") = objBind
Else
objBind = CType(Cache("Cache_DynamicColumns"), DataSet)
End If
Return objBind
End Function
Private SubLoadColumnSettings()
Dim objSQL As New SqlDataProvider
Dim objBind As New DataSet
Dim iCount As Integer = 0
Dim i As Integer = 0
Dim sFieldTitle As String = ""
Dim sFieldName As String = ""
Dim sAlignment As String = ""
Dim sFormat As String = ""
grvObject.Columns.Clear()
objBind = BindColumnSettings()
If Not objBind Is Nothing Then
If objBind.Tables(0).Rows.Count > 0 Then
iCount = objBind.Tables(0).Rows.Count
For i = 0 ToiCount - 1
Dim row As DataRow = objBind.Tables(0).Rows(i)
If Not IsDBNull(row("ColumnName")) Then
sFieldName = row("ColumnName").ToString()
End If
If Not IsDBNull(row("ColumnTitle")) Then
sFieldTitle = row("ColumnTitle").ToString()
End If
If Not IsDBNull(row("Alignment")) Then
sAlignment = row("Alignment").ToString()
End If
If Not IsDBNull(row("Format")) Then
sFormat = row("Format").ToString()
End If
oColumnTemplate.AddBoundColumn(grvObject, sFieldTitle, sFieldName, sAlignment, sFormat)
Next
End If
End If
End Sub
#End Region
#Region "Bind Data"
Private SubBindAccount()
Dim objBind As New DataTable
objBind = BindData()
If Not objBind Is Nothing Then
If objBind.Rows.Count > 0 Then
grvObject.DataSource = objBind
grvObject.DataBind()
trMessage.Visible = False
grvObject.Visible = True
Else
trMessage.Visible = True
grvObject.Visible = False
End If
updatePanel.Update()
End If
End Sub
Private FunctionBindData() As DataTable
Dim objSQL As New SqlDataProvider
Dim objBind As DataTable = objSQL.FillTable("Pro_Accounts_List", New ObjectPara("@Keyword", txtSearch.Text.Trim), _
New ObjectPara("@SortField", "CreatedDate"), _
NewObjectPara("@SortType", "DESC"))
Return objBind
End Function
#End Region
#Region "GridView Methods"
Private SubgrvObject_PageIndexChanging(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewPageEventArgs) Handles grvObject.PageIndexChanging
grvObject.PageIndex = e.NewPageIndex
BindData()
End Sub
#End Region
#Region "Event Handles"
Protected SubPage_Load(ByVal sender AsObject, ByVal e As System.EventArgs) Handles Me.Load
Try
LoadColumnSettings()
BindAccount()
If Page.IsPostBack = False Then
Page.Form.DefaultButton = cmdQuickSearch.UniqueID
End If
Catch ex As Exception
End Try
End Sub
Private SubcmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdQuickSearch.Click
BindAccount()
End Sub
#End Region
End Class
End Namespace
Chúc các bạn thành công!
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