(Tạo chức năng Master Detail cho GridView) – Ví dụ dưới đây sẽ hướng dẫn các bạn cách xây dựng chức năng Master Detail cho Gridview. Mô hình sử dụng sẽ là mối quan hệ giữa đơn hàng và danh sách các sản phẩm của đơn hàng. Khi kích vào 1 dòng đơn hàng, toàn bộ danh sách các sản phẩm của đơn hàng được chọn sẽ xuất hiện. Dưới đây là các bước thực hiện.

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- B1: Download CSDL Northwind

- 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.

Imports System.Data.SqlClient

Imports System.Data

Namespace MasterDetailDataInGridview

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

Dimadap As New 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

#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

- B3: Download các file ảnh tại đây, Copy các ảnh vào thư mục Images của Project

- B4: Tạo thư mục UserControls và thêm file OrderDetails.ascx, mở file dưới dạng HTML và nhập mã HTML.

<%@ ControlLanguage="vb"AutoEventWireup="false"CodeBehind="OrderDetails.ascx.vb"Inherits="MasterDetailDataInGridview.UserControls.OrderDetails"%>

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

<asp:Label ID="lblItemID"Visible="false"runat="server"/>

<asp:GridView ID="grvObject"runat="server"

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

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

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField HeaderText="ProductName">

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

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

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Discount">

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

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ExtendedPrice">

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

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</ContentTemplate>

</asp:UpdatePanel>

- B5: Nhập Code phía dưới cho file OrderDetails.ascx

C# Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Data;

using System.Web.UI.WebControls;

namespace MasterDetailDataInGridview.UserControls

{

partial class OrderDetails : System.Web.UI.UserControl

{

#region"Private Members"

private int _ItemID;

#endregion

#region"Bind Data"

public voidBindOrderDetail(int ItemID)

{

DataTable objBind = newDataTable();

lblItemID.Text = ItemID.ToString();

objBind = BindData();

if (objBind != null)

{

if (objBind.Rows.Count > 0)

{

grvObject.DataSource = objBind;

grvObject.DataBind();

grvObject.Visible = true;

}

else

{

grvObject.Visible = false;

}

updatePanel.Update();

}

public DataTableBindData()

{

SqlDataProvider objSQL = newSqlDataProvider();

if (!string.IsNullOrEmpty(lblItemID.Text))

{

ItemID =Convert.ToInt32(lblItemID.Text);

}

DataTable objBind = objSQL.FillTable("CustOrdersDetail", new ObjectPara("@OrderID", ItemID));

return objBind;

}

#endregion

#region"Properties"

public int ItemID

{

get { return _ItemID; }

set { _ItemID = value; }

}

#endregion

}

VB.NET Code

Namespace MasterDetailDataInGridview.UserControls

Partial Class OrderDetails

Inherits System.Web.UI.UserControl

#Region "Private Members"

Private _ItemID As Integer

#End Region

#Region "Bind Data"

Public SubBindOrderDetail(ByVal ItemID As Integer)

Dim objBind As New DataTable

lblItemID.Text = ItemID

objBind = BindData()

If Not objBind Is Nothing Then

If objBind.Rows.Count > 0 Then

grvObject.DataSource = objBind

grvObject.DataBind()

grvObject.Visible = True

Else

grvObject.Visible = False

End If

updatePanel.Update()

End If

End Sub

Public FunctionBindData() As DataTable

Dim objSQL As New SqlDataProvider

If lblItemID.Text <> ""Then

ItemID = lblItemID.Text

End If

Dim objBind As DataTable = objSQL.FillTable("CustOrdersDetail", New ObjectPara("@OrderID", ItemID))

Return objBind

End Function

#End Region

#Region "Properties"

Public PropertyItemID() As Integer

Get

Return _ItemID

End Get

Set(ByVal Value As Integer)

_ItemID = Value

End Set

End Property

#End Region

End Class

End Namespace

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

<%@ PageTitle="Display inline Master Detail data in a Asp.Net Gridview" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"CodeBehind="Default.aspx.vb"Inherits="MasterDetailDataInGridview._Default"%>

<%@ RegisterTagPrefix="OrderDetail"TagName="ListRecord"Src="~/UserControls/OrderDetails.ascx"%>

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

$("[src*=Expand]").live("click", function() {

$(this).closest("tr").after("<tr><td></td><td colspan = '999'>" + $(this).next().html() + "</td></tr>")

$(this).attr("src", "Images/Collapse.jpg");

});

$("[src*=Collapse]").live("click", function() {

$(this).attr("src", "Images/Expand.jpg");

$(this).closest("tr").next().remove();

});

</script>

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

</asp:ScriptManager>

<h3>

Display inline Master Detail data in a Asp.Net Gridview

</h3>

<br />

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

<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="OrderID"width="100%">

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField>

<asp:Panel ID="pnlOrders"runat="server"Style="display: none">

<OrderDetail:ListRecord ID="ucOrderDetails"runat="server"/>

</asp:Panel>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Customer"ItemStyle-Width="10%">

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

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="OrderDate">

<asp:Label ID="lblOrderDate"Text='<%# Eval("OrderDate").ToShortDateString %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="RequiredDate">

<asp:Label ID="lblRequiredDate"Text='<%# Eval("RequiredDate").ToShortDateString %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ShippedDate">

<asp:Label ID="lblShippedDate"Text='<%# Eval("ShippedDate").ToShortDateString %>' runat="server"></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ShipName">

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

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ShipAddress">

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

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B7: Viết Code cho file Default.aspx

C# Code

//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 MasterDetailDataInGridview

{

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

{

#region"Bind Data"

private void BindOrder()

{

DataTable objBind = newDataTable();

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 DataTableBindData()

{

SqlDataProvider objSQL = newSqlDataProvider();

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

return objBind;

}

#endregion

#region"GridView Methods"

protected voidgrvObject_RowDataBound(object sender, GridViewRowEventArgs e)

{

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

{

DateTime OrderDate = Convert.ToDateTime(DataBinder.Eval(e.Row.DataItem, "OrderDate"));

DateTime RequiredDate = Convert.ToDateTime(DataBinder.Eval(e.Row.DataItem, "RequiredDate"));

DateTime ShippedDate = Convert.ToDateTime(DataBinder.Eval(e.Row.DataItem, "ShippedDate"));

int OrderID =Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "OrderID"));

MasterDetailDataInGridview.UserControls.OrderDetailsucOrderDetails = (MasterDetailDataInGridview.UserControls.OrderDetails)e.Row.FindControl("ucOrderDetails");

if (ucOrderDetails != null)

{

if(OrderID != -1 & OrderID != 0)

{

ucOrderDetails.BindOrderDetail(OrderID);

}

Label lblOrderDate = (Label)e.Row.FindControl("lblOrderDate");

if(lblOrderDate != null)

{

if (OrderDate != null)

{

lblOrderDate.Text = OrderDate.ToString("MM/dd/yyyy");

}

else

{

lblOrderDate.Text = "-";

}

Label lblRequiredDate = (Label)e.Row.FindControl("lblRequiredDate");

if (lblRequiredDate != null)

{

if (RequiredDate != null)

{

lblRequiredDate.Text = RequiredDate.ToString("MM/dd/yyyy");

}

else

{

lblRequiredDate.Text = "-";

}

Label lblShippedDate = (Label)e.Row.FindControl("lblShippedDate");

if (lblShippedDate != null)

{

if(ShippedDate != null)

{

lblShippedDate.Text = ShippedDate.ToString("MM/dd/yyyy");

}

else

{

lblShippedDate.Text = "-";

}

protected voidgrvObject_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgse)

{

grvObject.PageIndex = e.NewPageIndex;

BindOrder();

}

#endregion

#region"Event Handles"

protected voidPage_Load(object sender, System.EventArgs e)

{

try

{

if (!IsPostBack)

{

BindOrder();

}

catch

{

}

#endregion

}

VB.NET Code

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

Imports System.IO

Namespace MasterDetailDataInGridview

Public Class _Default

Inherits System.Web.UI.Page

#Region "Bind Data"

Private SubBindOrder()

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 FunctionBindData() As DataTable

Dim objSQL As New SqlDataProvider

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

Return objBind

End Function

#End Region

#Region "GridView Methods"

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

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

Dim OrderID AsInteger = DataBinder.Eval(e.Row.DataItem, "OrderID")

Dim ucOrderDetails As MasterDetailDataInGridview.UserControls.OrderDetails = CType(e.Row.FindControl("ucOrderDetails"), MasterDetailDataInGridview.UserControls.OrderDetails)

If ucOrderDetails IsNot Nothing Then

If OrderID <> -1 And OrderID <> 0 Then

ucOrderDetails.BindOrderDetail(OrderID)

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

BindOrder()

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

BindOrder()

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 mũi tên trỏ xuống danh sách các sản phẩm của đơn hàng sẽ xuất hiện.

Chúc các bạn thành công!

Quang Bình

Xây dựng chức năng Master Detail cho GridView trong Asp.net

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