(Làm thế nào để xuất dữ liệu Gridview sang PDF trong Asp.net) – Với iTextSharp người phát triển có thể có nhiều lựa chọn để xuất dữ liệu sang PDF, bài viết dưới đây sẽ giới thiệu thêm với các bạn 1 cách xuất file PDF khác. Với cách này iTextSharp sẽ lấy toàn bộ dữ liệu đã được hiển thị trên Gridview để xuất ra file PDF. Khi thực hiện chương trình sẽ tự động xác định độ rộng và tiêu đề cột trong PDF tương ứng với độ rộng và tiêu đề cột trên Gridview.

Nghe những bài hát đỉnh nhất về Thấy cô giáo - Nghe trên Youtube

- B1: Tạo CSDL SQL Customers

- B2: Tạo Bảng Accounts có cấu trúc phía dưới trong CSDL 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 các stored procedure trong SQL Server

USE [Customers]

CREATE PROCEDURE [dbo].[Pro_Accounts_Get]

@AccountID int

SELECT * FROM Accounts

WHERE

AccountID = @AccountID

CREATE PROCEDURE [dbo].[Pro_Accounts_List]

@Keyword nvarchar(250),

@SortField nvarchar(50),

@SortType nvarchar(10)

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

Bạn có thể tải về bảng cơ sở dữ liệu SQL bằng cách nhấn vào liên kết tải về dưới đây

- 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 ExportSelectedGridViewRowUsingItextsharp

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 sql AsString) As DataTable

Try

Dim tb AsNew DataTable

Dim adap AsNew SqlDataAdapter(sql, _connectionString)

adap.Fill(tb)

Return tb

Catch ex As Exception

Return Nothing

End Try

End Function

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

ForEach 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

Public FunctionRunSQL(ByVal ProcName AsString, ByVal ParamArray Para() As ObjectPara) As Object

Try

Dim _cnn AsNew SqlConnection(_connectionString)

_cnn.Open()

Dim cmd AsNew SqlCommand(ProcName, _cnn)

cmd.CommandType = CommandType.StoredProcedure

For Eachp As ObjectParaIn Para

cmd.Parameters.Add(New SqlParameter(p.Name, p.Value))

Return cmd.ExecuteScalar

Catch ex As Exception

Return Nothing

End Try

End Function

Public FunctionGetRow(ByVal ProcName AsString, ByVal ParamArray Para() As ObjectPara) As DataRow

Try

Dim tb AsNew DataTable

Dim adap AsNew SqlDataAdapter(ProcName, _connectionString)

adap.SelectCommand.CommandType = CommandType.StoredProcedure

For Eachp As ObjectParaIn Para

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

adap.Fill(tb)

Iftb.Rows.Count Then

Return tb.Rows(0)

End If

Catch ex As Exception

Return Nothing

End Try

Return Nothing

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 MyEventArgs

Inherits EventArgs

Private Name As String

Private MyId As String

Public PropertySelectedName() As String

Get

Return Name

End Get

Set(ByVal value As String)

Name = value

End Set

End Property

Public Property Id() As String

Get

Return MyId

End Get

Set(ByVal value As String)

MyId = value

End Set

End Property

End Class

Public Class Constants

Public ConstDEFAULT_COLOR_COMPANYNAME As String = "#007dc2"

Public ConstDEFAULT_BACKGROUNDCOLOR_HEADERROW As String = "#99cd00"

Public ConstDEFAULT_COLOR_HEADERROW As String = "#ffffff"

Public ConstDEFAULT_BORDERCOLOR_TABLE As String = "#808080"

Public ConstDEFAULT_BACKGROUNDCOLOR_ROW As String = "#edf5ff"

End Class

End Namespace

Chú ý: Thuộc tính SiteSqlServer chính là chuỗi Connect với SQL Server trong file Web.Config

- B6: Download thư viện iTextSharp tại đây

- B7: References itextsharp.dll trong thư mục vừa giải nén vào Project

- B8: Tạo thư mục Fonts, Download Font ARIALUNI.TTF tại đây và copy file này vào thư mục vừa tạo.

- B9: Download các file ảnh tại đây, Copy ảnh lần lượt vào các thư mục Images

+ delete.gif, icon_search.gif vào thư mục Images
+ no.png, yes.png, sprite.png, lt.gif, icon_pdf.gif vào thư mục Styles\Images

- B10: Mở file Default.aspxdưới dạng HTML và nhập mã HTML

<%@ PageTitle="Export Selected GridView Row Using itextsharp in ASP.Net" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"CodeBehind="Default.aspx.vb"Inherits="ExportSelectedGridViewRowUsingItextsharp._Default"%>

<%@ RegisterTagPrefix="ModalPopup"TagName="Delete"Src="~/UserControls/Popup_ConfirmDelete.ascx"%>

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

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

</asp:ScriptManager>

<h1>

Export Selected GridView Row Using itextsharp in ASP.Net

</h1>

<br />

<ModalPopup:Delete ID="ucDeleteItem"runat="server"/>

<asp:Literal ID="ltScript"runat="server"></asp:Literal>

<asp:UpdatePanel ID="updatePanel"runat="server"UpdateMode="Conditional">

<tr>

<td>

<asp:LinkButton id="cmdExport" runat="server" CssClass="btn btn-small" Causesvalidation="false">

</asp:LinkButton>

<asp:LinkButton id="cmdExportAll" runat="server" CssClass="btn btn-small" Causesvalidation="false">

</asp:LinkButton>

</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" AllowPaging="true" PageSize="8"

CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"

BorderWidth="1"AutoGenerateColumns="false"DataKeyNames="AccountID"width="100%">

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField>

<asp:CheckBox ID="chkAll" runat="server"/>

</HeaderTemplate>

<asp:CheckBox ID="chkSelect"runat="server"/>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField ItemStyle-Width="10%"DataField="AccountCode"HeaderText="AccountCode"/>

<asp:BoundField ItemStyle-Width="15%"DataField="AccName"HeaderText="AccountName"/>

<asp:BoundField ItemStyle-Width="10%"DataField="AccPhone"HeaderText="Phone"/>

<asp:BoundField ItemStyle-Width="10%"DataField="AccFAX"HeaderText="FAX"/>

<asp:BoundField ItemStyle-Width="15%"DataField="AccEmail"HeaderText="Email"/>

<asp:TemplateField HeaderText="Function">

<asp:ImageButton ID="cmdDelete"CommandName="Delete"CommandArgument='<%# Eval("AccountID")%>' runat="server"ImageUrl="~/images/delete.gif"CausesValidation="False"></asp:ImageButton>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

<asp:PostBackTrigger ControlID="cmdExport"/>

<asp:PostBackTrigger ControlID="cmdExportAll"/>

</Triggers>

</asp:UpdatePanel>

</asp:Content>

- B11: Viết Code cho file Default.aspx

Imports iTextSharp.text.html

Imports iTextSharp.text

Imports iTextSharp.text.html.simpleparser

Imports iTextSharp.text.pdf

Namespace ExportSelectedGridViewRowUsingItextsharp

Public Class _Default

Inherits System.Web.UI.Page

#Region "Export PDF"

Private SubExportToPDF(ByVal FileName As String, ByVal ExportAll As Boolean)

Dim document As New Document(PageSize.A4.Rotate, 20, 20, 30, 20)

Dim msReport As New System.IO.MemoryStream()

Dim FilePath As String = ""

FilePath = Server.MapPath("Fonts\ARIALUNI.TTF")

Dim fontpath As String = FilePath

'"simsun.ttf" file was downloaded from web and placed in the folder

Dim bf As BaseFont = BaseFont.CreateFont(fontpath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED)

'create new font based on BaseFont

Dim fontCompany As New Font(bf, 13, Font.BOLD, New Color(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_COLOR_COMPANYNAME)))

Dim fontHeader As New Font(bf, 12, Font.BOLD, Color.BLUE)

Dim fontSubHeader As New Font(bf, 10)

Dim fontTitle As New Font(bf, 11, Font.BOLD, Color.BLACK)

Dim fontContent As New Font(bf, 11, Font.NORMAL, Color.BLACK)

Dim fontTableHeader AsNew Font(bf, 10, Font.BOLD, NewColor(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_COLOR_HEADERROW)))

Try

' creation of the different writers

Dim writer AsPdfWriter = PdfWriter.GetInstance(document, msReport)

' we add some meta information to the document

document.AddAuthor("Thu thuat lap trinh")

document.AddSubject("Export to PDF")

document.Open()

Dim cBreak AsNew Chunk(Environment.NewLine)

Dim pBreak AsNew Phrase()

Dim paBreak AsNew Paragraph()

'=================Start Header =====================

'CompnayName

Dim sText AsString = "THỦ THUẬT LẬP TRÌNH" & vbCrLf

Dim beginning AsNew Chunk(sText, fontCompany)

Dim p1 AsNew Phrase(beginning)

Dim pCompanyName As New Paragraph()

pCompanyName.IndentationLeft = 30

pCompanyName.Add(p1)

document.Add(pCompanyName)

'Website

Dim sWebsite AsString = "Website: http://thuthuatlaptrinh.blogspot.com"

sText = ""

If sWebsite <> "" Then

sText = sWebsite & vbCrLf

End If

If sText <> "" Then

sText = sText.Replace(Environment.NewLine, String.Empty).Replace(" ", String.Empty)

beginning = New Chunk(sText, fontSubHeader)

p1 = New Phrase(beginning)

Dim pAddresse AsNew Paragraph()

pAddresse.IndentationLeft = 30

pAddresse.Add(p1)

document.Add(pAddresse)

End If

Dim sEmail AsString = "Email: kenhphanmemviet@gmail.com"

If sEmail <> "" Then

sText = sEmail & vbCrLf

End If

If sText <> "" Then

sText = sText.Replace(Environment.NewLine, String.Empty).Replace(" ", String.Empty)

beginning = New Chunk(sText, fontSubHeader)

p1 = New Phrase(beginning)

Dim pAddresse AsNew Paragraph()

pAddresse.IndentationLeft = 30

pAddresse.Add(p1)

document.Add(pAddresse)

End If

'=================End Header =====================

'Title

sText = "LIST ACCOUNT"& Environment.NewLine & vbCrLf

If sText <> "" Then

beginning = New Chunk(sText, fontHeader)

p1 = New Phrase(beginning)

Dim pAddresse AsNew Paragraph()

pAddresse.IndentationLeft = 10

pAddresse.Alignment = 1

pAddresse.Add(p1)

document.Add(pAddresse)

End If

If ExportAll Then

BindAccount()

grvObject.AllowPaging = False

grvObject.DataBind()

End If

Dim iColumn AsInteger = grvObject.Columns.Count - 2

If iColumn > 0 Then

Dim datatable AsNew iTextSharp.text.Table(iColumn)

datatable.Padding = 2

datatable.Spacing = 1

datatable.WidthPercentage = 98

Dim headerwidths As Single() = New Single(grvObject.Columns.Count - 3) {}

For x AsInteger = 0 ToiColumn - 1

'Header Table

headerwidths(x) = CInt(grvObject.Columns(x + 1).ItemStyle.Width.Value)

DimcellText As NewCell(New Phrase(Server.HtmlDecode(grvObject.HeaderRow.Cells(x + 1).Text), fontTableHeader))

cellText.BackgroundColor = New Color(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_BACKGROUNDCOLOR_HEADERROW))

cellText.HorizontalAlignment = 1

cellText.VerticalAlignment = 1

datatable.AddCell(cellText)

datatable.Widths = headerwidths

datatable.BorderWidth = 1

datatable.DefaultCellBorderWidth = 1

datatable.DefaultHorizontalAlignment = 1

datatable.DefaultVerticalAlignment = 1

datatable.DefaultCellBorderColor = NewiTextSharp.text.Color(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_BORDERCOLOR_TABLE))

datatable.BorderColor = NewiTextSharp.text.Color(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_BORDERCOLOR_TABLE))

Dim iRow AsInteger = grvObject.Rows.Count

Dim b_SelectedRow As Boolean = False

For i AsInteger = 0 ToiRow - 1

If grvObject.Rows(i).RowType = DataControlRowType.DataRow Then

For j As Integer = 1 ToiColumn

Dim mySelectedRow As GridViewRow = grvObject.Rows(i)

Dim chkSelect As CheckBox = TryCast(mySelectedRow.Cells(0).FindControl("chkSelect"), CheckBox)

If Not chkSelect Is Nothing Then

If ExportAll Then

b_SelectedRow = True

Else

b_SelectedRow = chkSelect.Checked

End If

If b_SelectedRow Then

Dim mySelectedCell AsTableCell

Dim cellText As String = ""

mySelectedCell = mySelectedRow.Cells(j)

cellText = mySelectedCell.Text

Dim cell As New iTextSharp.text.Cell(cellText)

'Set Color of Alternating row

If i Mod 2 <> 0 Then

cell.BackgroundColor = New Color(System.Drawing.ColorTranslator.FromHtml(Constants.DEFAULT_BACKGROUNDCOLOR_ROW))

End If

datatable.DefaultHorizontalAlignment = Element.ALIGN_LEFT

datatable.AddCell(cell)

End If

document.Add(datatable)

End If

Catch e As Exception

Console.Error.WriteLine(e.Message)

End Try

document.Close()

Response.Clear()

Response.AddHeader("content-disposition", "attachment;filename=" & FileName & ".pdf")

Response.ContentType = "application/pdf"

Response.BinaryWrite(msReport.ToArray())

Response.End()

End Sub

#End Region

#Region "Bind Data"

Private Sub BindAccount()

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"), _

New ObjectPara("@SortType", "DESC"))

Return objBind

End Function

#End Region

#Region "GridView Methods"

Private SubgrvObject_RowDeleting(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewDeleteEventArgs) Handles grvObject.RowDeleting

Dim ItemID As Integer = CType(grvObject.DataKeys(e.RowIndex).Value, Integer)

Dim ItemName As String = ""

If ItemID <> -1 Then

With CType(ucDeleteItem, ExportSelectedGridViewRowUsingItextsharp.UserControls.Popup_ConfirmDelete)

.ItemID = ItemID

.ShowPopup(ItemID, "")

End With

End If

End Sub

Private Sub grvObject_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles grvObject.RowDataBound

If (e.Row.RowType = DataControlRowType.DataRow) Then

'Delete

Dim cmdDelete AsImageButton = DirectCast(e.Row.FindControl("cmdDelete"), ImageButton)

If NotcmdDelete Is NothingThen

cmdDelete.ToolTip = "Delete Account"

End If

End Sub

Private SubgrvObject_PageIndexChanging(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewPageEventArgs) Handles grvObject.PageIndexChanging

grvObject.PageIndex = e.NewPageIndex

BindAccount()

End Sub

#End Region

#Region "Popup"

Private SubMySelDelete_OnSelectedRow(ByVal sender As Object, ByVal e AsExportSelectedGridViewRowUsingItextsharp.MyEventArgs)

Dim ItemName As String = ""

With e

If e.Id <> "" Then

BindAccount()

EndIf

End With

End Sub

#End Region

#Region "Event Handles"

Protected SubPage_Load(ByVal sender AsObject, ByVal e As System.EventArgs) Handles Me.Load

Try

AddHandler CType(ucDeleteItem, ExportSelectedGridViewRowUsingItextsharp.UserControls.Popup_ConfirmDelete).OnSelectedRow, AddressOf MySelDelete_OnSelectedRow

If Page.IsPostBack = False Then

'Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID

BindAccount()

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

Private SubcmdExport_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdExport.Click

ExportToPDF("List-Account.pdf", False)

End Sub

Private SubcmdExportAll_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdExportAll.Click

ExportToPDF("List-Account.pdf", True)

End Sub

#End Region

End Class

End Namespace

- B12: Mở file Site.Master dưới dạng HTML và gắn thêm mã Javascript. Đoạn mã này có chức năng chọn toàn bộ các dòng khi tích chọn.

$("[id*=chkAll]").live("click", function() {

var chkAll = $(this);

var grid = $(this).closest("table");

$("input[type=checkbox]", grid).each(function () {

if (chkAll.is(":checked")) {

$(this).attr("checked", "checked");

$("td", $(this).closest("tr")).addClass("selected");

} else {

$(this).removeAttr("checked");

$("td", $(this).closest("tr")).removeClass("selected");

}

});

$("[id*=chkSelect]").live("click", function() {

var grid = $(this).closest("table");

var chkAll = $("[id*=chkAll]", grid);

if (!$(this).is(":checked")) {

$("td", $(this).closest("tr")).removeClass("selected");

chkAll.removeAttr("checked");

} else {

$("td", $(this).closest("tr")).addClass("selected");

if ($("[id*=chkSelect]", grid).length == $("[id*=chkSelect]:checked", grid).length) {

chkAll.attr("checked", "checked");

}

});

</script>

Bây giờ chạy Project bạn sẽ có kết quả như ảnh phía dưới.

Chúc các bạn thành công!

Quang Bình

Export file PDF các bản ghi được chọn trên Gridview sử dụng iTextSharp trong ASP.Net

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