Sử dụng nhiều đối số trong CommandArgument trong Datalist

By Unknown - Thursday, August 20, 2015 - No Comments

(How to use multiple arguments in CommandArgument in Datalist) – Nếu như trong Gridview người lập trình có thể sử dụng nhiều giá trị trong Datakes và CommandArgument. Tuy nhiên trong Datalist Datakeys không có mà chỉ có DataKeyField và nó không cho phép sử dụng nhiều giá trị trong đó. Vậy còn CommandArgument thì sao? Datalist vẫn hỗ trợ CommandArgument và cho phép sử dụng nhiều đối số trong đó. Bài viết dưới đây sẽ hướng dẫn cách bạn cách sử dụng nhiều đối số và lấy ra giá trị của từng đối số trong CommandArgument Datalist.

Xem những Video hay dành cho thiếu nhi - Nghe trên Youtube

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

- B2: 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 MultipleArgumentsinCommandArgument

{

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 sql)

{

try

{

DataTable tb = new DataTable();

SqlDataAdapter adap = new SqlDataAdapter(sql, _connectionString);

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; }

}

VB.NET Code

Imports System.Data.SqlClient

Imports System.Data

Namespace MultipleArgumentsinCommandArgument

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 sql As String) As DataTable

Try

Dim tb As New DataTable

Dim adap As New SqlDataAdapter(sql, _connectionString)

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

End Namespace

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

- B3: Mở file Default.aspx dưới dạng HTML và nhập mã HTML
C#

<%@ Page Title="How to use multiple arguments in CommandArgument in Datalist" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="MultipleArgumentsinCommandArgument._Default" %>

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

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

</asp:ScriptManager>

<h3>

How to use multiple arguments in CommandArgument in Datalist

</h3>

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

<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>

</td>

</tr>

<tr>

<asp:Datalist ID="grvObject" runat="server" AllowPaging="true" PageSize="12"

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

BorderWidth="1" AutoGenerateColumns="false" DataKeyNames="ProductID" width="100%"

OnRowCommand="grvObject_RowCommand"

OnRowDataBound="grvObject_RowDataBound"

OnPageIndexChanging="grvObject_PageIndexChanging">

<asp:TemplateField HeaderText="ProductName">

<asp:Label ID="lblProductName" Text='<%# Eval("ProductName") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="QuantityPerUnit">

<asp:Label ID="lblQuantityPerUnit" Text='<%# Eval("QuantityPerUnit") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitPrice">

<asp:Label ID="lblUnitPrice" Text='<%# Eval("UnitPrice") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitsInStock">

<asp:Label ID="lblUnitsInStock" Text='<%# Eval("UnitsInStock") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitsOnOrder">

<asp:Label ID="lblUnitsOnOrder" Text='<%# Eval("UnitsOnOrder") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<asp:ImageButton ID="cmdDetail" CommandName="View" CommandArgument='<%# Eval("ProductID") + "," + Eval("SupplierID") + "," + Eval("CategoryID") %>' runat="server" ImageUrl="~/Images/icon_detail.png" CausesValidation="False"></asp:ImageButton>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:Datalist>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

VB.Net Code

<%@ Page Title="How to use multiple arguments in CommandArgument in Datalist" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="MultipleArgumentsinCommandArgument._Default" %>

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

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

</asp:ScriptManager>

<h3>

How to use multiple arguments in CommandArgument in Datalist

</h3>

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

<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>

</td>

</tr>

<tr>

<asp:Datalist ID="grvObject" runat="server" AllowPaging="true" PageSize="12"

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

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

<asp:TemplateField HeaderText="ProductName">

<asp:Label ID="lblProductName" Text='<%# Eval("ProductName") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="QuantityPerUnit">

<asp:Label ID="lblQuantityPerUnit" Text='<%# Eval("QuantityPerUnit") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitPrice">

<asp:Label ID="lblUnitPrice" Text='<%# Eval("UnitPrice") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitsInStock">

<asp:Label ID="lblUnitsInStock" Text='<%# Eval("UnitsInStock") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="UnitsOnOrder">

<asp:Label ID="lblUnitsOnOrder" Text='<%# Eval("UnitsOnOrder") %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<asp:ImageButton ID="cmdDetail" CommandName="View" CommandArgument='<%# Eval("ProductID") & "," & Eval("SupplierID") & "," & Eval("CategoryID") %>' runat="server" ImageUrl="~/Images/icon_detail.png" CausesValidation="False"></asp:ImageButton>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:Datalist>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B4: Viết Code cho file Default.aspx

C#

//Visit http://www.laptrinhdotnet.com for more ASP.NET Tutorials

using Microsoft.VisualBasic;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.Diagnostics;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace MultipleArgumentsinCommandArgument

{

public partial class _Default : System.Web.UI.Page

{

#region "Private Methods"

private void ShowMessage(int ProductID, int SupplierID, int CategoryID)

{

string sMessage = "ProductID: " + ProductID + " - SupplierID: " + SupplierID + " - CategoryID: " + CategoryID;

ScriptManager.RegisterClientScriptBlock(this.Page, this.Page.GetType(), "alert", "alert('" + sMessage + "');", true);

}

#endregion

#region "Bind Data"

private void BindProduct()

{

DataTable objBind = new DataTable();

objBind = BindData();

if (objBind != null)

{

if (objBind.Rows.Count > 0)

{

grvObject.DataSource = objBind;

grvObject.DataBind();

trMessage.Visible = false;

grvObject.Visible = true;

updatePanel.Update();

}

else

{

trMessage.Visible = true;

grvObject.Visible = false;

}

private DataTable BindData()

{

SqlDataProvider objSQL = new SqlDataProvider();

DataTable objBind = objSQL.FillTable("Select Products.* From Products");

return objBind;

}

#endregion

#region "Datalist Methods"

protected void grvObject_RowCommand(object sender, System.Web.UI.WebControls.DatalistCommandEventArgs e)

{

if (e.CommandName.ToLower() != "sort" & e.CommandName.ToLower() != "page" && !string.IsNullOrEmpty(e.CommandArgument.ToString()))

{

string[] CommandArgument = e.CommandArgument.ToString().Split(',');

int ProductID = -1;

int SupplierID = -1;

int CategoryID = -1;

if (CommandArgument.Length > 0)

{

ProductID = Convert.ToInt32(CommandArgument[0]);

SupplierID = Convert.ToInt32(CommandArgument[1]);

CategoryID = Convert.ToInt32(CommandArgument[2]);

}

switch (e.CommandName.ToLower())

{

case "view":

if (ProductID > 0 & SupplierID > 0 & CategoryID > 0)

{

ShowMessage(ProductID, SupplierID, CategoryID);

}

break;

}

protected void grvObject_RowDataBound(object sender, DatalistRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

ImageButton cmdDetail = (ImageButton)e.Row.FindControl("cmdDetail");

if (cmdDetail != null)

{

cmdDetail.ToolTip = "View Details";

}

protected void grvObject_PageIndexChanging(object sender, System.Web.UI.WebControls.DatalistPageEventArgs e)

{

grvObject.PageIndex = e.NewPageIndex;

BindProduct();

}

#endregion

#region "Event Handles"

protected void Page_Load(object sender, System.EventArgs e)

{

try

{

if (!IsPostBack)

{

BindProduct();

}

catch

{

}

#endregion

}

VB.NET Code

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

Namespace MultipleArgumentsinCommandArgument

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Methods"

Private Sub ShowMessage(ByVal ProductID As Integer, ByVal SupplierID As Integer, ByVal CategoryID As Integer)

Dim sMessage As String = "ProductID: " & ProductID & _

" - SupplierID: " & SupplierID & _

" - CategoryID: " & CategoryID

ScriptManager.RegisterClientScriptBlock(Me.Page, Me.Page.GetType(), "alert", "alert('" & sMessage & "');", True)

End Sub

#End Region

#Region "Bind Data"

Private Sub BindProduct()

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

updatePanel.Update()

Else

trMessage.Visible = True

grvObject.Visible = False

End If

End Sub

Private Function BindData() As DataTable

Dim objSQL As New SqlDataProvider

Dim objBind As DataTable = objSQL.FillTable("Select Products.* From Products")

Return objBind

End Function

#End Region

#Region "Datalist Methods"

Private Sub grvObject_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DatalistCommandEventArgs) Handles grvObject.RowCommand

If (e.CommandName.ToLower <> "sort" And e.CommandName.ToLower <> "page" AndAlso e.CommandArgument.ToString <> "") Then

Dim CommandArgument() As String = e.CommandArgument.ToString.Split(",")

Dim ProductID As Integer = -1

Dim SupplierID As Integer = -1

Dim CategoryID As Integer = -1

If CommandArgument.Length > 0 Then

ProductID = CommandArgument(0)

SupplierID = CommandArgument(1)

CategoryID = CommandArgument(2)

End If

Select Case e.CommandName.ToLower

Case "view"

If ProductID > 0 And SupplierID > 0 And CategoryID > 0 Then

ShowMessage(ProductID, SupplierID, CategoryID)

End If

End Select

End If

End Sub

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

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

Dim cmdDetail As ImageButton = DirectCast(e.Row.FindControl("cmdDetail"), ImageButton)

If Not cmdDetail Is Nothing Then

cmdDetail.ToolTip = "View Details"

End If

End Sub

Private Sub grvObject_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DatalistPageEventArgs) Handles grvObject.PageIndexChanging

grvObject.PageIndex = e.NewPageIndex

BindProduct()

End Sub

#End Region

#Region "Event Handles"

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Try

If Page.IsPostBack = False Then

BindProduct()

End If

Catch ex As Exception

End Try

End Sub

#End Region

End Class

End Namespace

Bây giờ chạy Project, và mỗi khi kích vào cột cuối cùng, một Popup sẽ xuất hiện hiển thị các giá trị của CommandArgument.

Chúc các bạn thành công!

Quang Bình

News Ticker