(Showing icon in gridview according to type of document) – Khi hiển thị danh sách tài liệu trên Gridview, nếu chỉ để tên tài liệu người sử dụng rất khó biết được loại file của từng tài liệu. Nếu bổ xung thêm cột Icon thể hiện từng loại file vừa giúp Gridview chuyên nghiệp hơn lại giúp người sử dụng dễ dàng hơn trong việc sử dụng và download khi cần thiết. Bài viết dưới đây sẽ hướng dẫn các bạn cách hiển thị Icon theo từng loại tài liệu và mỗi khi kích vào tên tài liệu, cửa sổ Popup xuất hiện cho phép người dùng Download file.

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

- B1: Tạo CSDL Demo_Documents trong SQL Server

- B2: Tạo Bảng Documents có cấu trúc phía dưới

STT	Tên trường	Kiểu trường	Ghi chú
1	DocumentID	Int	Trường tự tăng
2	DocumentName	nvarchar(250)
3	FileName	nvarchar(250)
4	FileSize	nvarchar(50)
5	Description	nvarchar(250)
6	CreatedDate	datetime
7	ModifiedDate	datetime

- B3: Nhập dữ liệu cho bảng Documents

- B4: Tạo stored procedure trong SQL Server

USE[Demo_Documents]

CREATE PROCEDURE [dbo].[Pro_Documents_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 Documents'

set @strWhere =' Where 1=1 '

if @Keyword<>''

set @strWhere= @strWhere +' And (DocumentName like N''%' +@Keyword+'%''

Or FileName like N''%' +@Keyword+'%'')'

if @SortField='CreatedDate'

Begin

set @strOrder =' Order by CreatedDate'

End

Else

Begin

set @strOrder =' Order by DocumentName'

End

set @strSQL=@strSQL+@strWhere+@strOrder

print @strSQL

exec sp_executesql @strSQL

CREATE PROCEDURE [dbo].[Pro_Documents_Get]

@DocumentID int

SELECT * FROM Documents

WHERE

DocumentID = @DocumentID

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 ShowingIconGridviewAccordingtoTypeofDocument

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))

End If

adap.Fill(tb)

Return tb

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)

If tb.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

End Namespace

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

- B6: Mở file Default.aspxdưới dạng HTML và nhập mã HTML

<%@ PageTitle="Showing Icon in Gridview according to type of Document" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"EnableEventValidation="false" CodeBehind="Default.aspx.vb" Inherits="ShowingIconGridviewAccordingtoTypeofDocument._Default"%>

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

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

</asp:ScriptManager>

<h3>

Showing Icon in Gridview according to type of Document

</h3>

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

<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" AllowPaging="true" PageSize="12"

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

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

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField HeaderText = "Number">

<asp:Label ID="lblRowNumber" Text='<%# Container.DataItemIndex + 1 %>' runat="server"/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<asp:Image ID="imgIcon"runat="server"/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="DocumentName">

<asp:LinkButton id="cmdDownload"runat="server"CommandName="Download"CommandArgument='<%# Eval("DocumentID") %>' CssClass="Title"text='<%# Eval("DocumentName") %>'></asp:LinkButton>

</ItemTemplate>

</asp:TemplateField>

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

<asp:BoundField ItemStyle-Width="8%"DataField="FileSize"HeaderText="FileSize"/>

<asp:BoundField ItemStyle-Width="12%"DataField="CreatedDate"HeaderText="CreatedDate"/>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B7: Viết Code cho file Default.aspx

'Visit http://thuthuatlaptrinh.blogspot.com for more ASP.NET Tutorials

Imports System.IO

Namespace ShowingIconGridviewAccordingtoTypeofDocument

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Methods"

Private strExtension AsString = ""

Private filePath As String = ""

#End Region

#Region "Private Methods"

Private FunctionFormatIconURL(ByVal FileExtension As String) As String

Dim strImage As String = ""

strImage = IIf(HttpContext.Current.Request.ApplicationPath = "/", HttpContext.Current.Request.ApplicationPath, HttpContext.Current.Request.ApplicationPath & "/") & "Images/icons/" & FileExtension & ".gif"

If Not File.Exists(HttpContext.Current.Server.MapPath(strImage)) Then

strImage = IIf(HttpContext.Current.Request.ApplicationPath = "/", HttpContext.Current.Request.ApplicationPath, HttpContext.Current.Request.ApplicationPath & "/") & "/Images/icons/unknown.gif"

End If

Return strImage

End Function

Private FunctionGetFileName(ByVal ItemID As Integer) As String

Dim objSQL As New SqlDataProvider

Dim FileName As String = ""

Dim objInfo As DataRow = objSQL.GetRow("Pro_Documents_Get", New ObjectPara("@DocumentID", ItemID))

If Not objInfo Is Nothing Then

If NotIsDBNull(objInfo("FileName")) Then

FileName = objInfo("FileName")

End If

Return FileName

End Function

Private SubDownloadFile(ByVal filepath As String)

If filepath <> ""Then

Dim file AsNew System.IO.FileInfo(filepath)

If file.Exists Then

Response.Clear()

Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name)

Response.AddHeader("Content-Length", file.Length.ToString())

Response.ContentType = "application/octet-stream"

Response.WriteFile(file.FullName)

Response.End()

Else

Response.Write("This file does not exist.")

End If

Else

Response.Write("Please provide a file to download.")

End If

End Sub

#End Region

#Region "Bind Data"

Private SubBindDocument()

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_Documents_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_RowCommand(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewCommandEventArgs) Handles grvObject.RowCommand

Dim ItemID As Integer = Integer.Parse(e.CommandArgument)

Dim FileName As String = ""

Select Casee.CommandName.ToLower

Case "download"

FileName = GetFileName(ItemID)

filePath = MapPath("~/Documents/") & FileName

If File.Exists(filePath) Then

DownloadFile(filePath)

End If

End Select

End Sub

Private SubgrvObject_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) HandlesgrvObject.RowDataBound

If e.Row.RowType = DataControlRowType.DataRow Then

Dim FileName AsString = DataBinder.Eval(e.Row.DataItem, "FileName")

Dim imgIcon AsImage = CType(e.Row.FindControl("imgIcon"), Image)

If FileName <> "" Then

strExtension = Replace(Path.GetExtension(FileName), ".", "")

End If

If NotimgIcon Is NothingThen

imgIcon.ImageUrl = FormatIconURL(strExtension)

imgIcon.ImageAlign = ImageAlign.Middle

End If

Dim cmdDownload AsLinkButton = CType(e.Row.FindControl("cmdDownload"), LinkButton)

If cmdDownload IsNotNothing Then

cmdDownload.ToolTip = "Click to Download"

ScriptManager.GetCurrent(Page).RegisterPostBackControl(cmdDownload)

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

BindDocument()

End Sub

#End Region

#Region "Event Handles"

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

Try

If Page.IsPostBack = False Then

'Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID

BindDocument()

End If

Catch ex As Exception

End Try

End Sub

Private SubcmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdQuickSearch.Click

BindDocument()

End Sub

#End Region

End Class

End Namespace

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

Chúc các bạn thành công!

Quang Bình

Hiển thị icon theo loại tài liệu trong Gridview

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