| 作者：孟宪会 出自：【孟宪会之精彩世界】 发布日期：2003年4月18日 0点0分0秒 |
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大家在实际工作中有没有遇到要在DataGrid中显示带有主次结构的数据呢？如果你对ADO.NET和SQL Server2000熟悉的话，我们下面就举一个利用VS.NET自带的示例数据库Northwind和VB.NET来说明如何实现这一目标。 下面就是要绑定到HierarchicalDataGrid.aspx的VB.NET代码文件HierarchicalDataGrid.aspx.vb的内容： Imports System.Data.SqlClient 在HierarchicalDataGrid.aspx中，我们为DataGrid1建立模板列，并把另外一个DataGrid嵌入到这个模板列，父一级的DataGrid用来显示主记录，比如：订单。子一级DataGrid用来显示详细信息，比如：订单的详细信息。我们这样为子DataGrid动态指定数据源： DataSource='<%# Ctype(Container.DataItem,DataRowView).CreateChildView("OrderRelation") %>'> 上面这句就是实现显示主次关系数据的关键。根据当前父一级记录，DataRowView.CreateChildView利用前面创建的关系的名字作为参数获得子记录，并把它绑定到子DataGrid上。 下面就是我们要显示的ASPX页面的代码，HierarchicalDataGrid.aspx： <%@ Page Language="vb" AutoEventWireup="false" Codebehind="HierarchicalDataGrid.aspx.vb" Inherits="HierarchicalDataGrid.HierarchicalDataGrid" %> 在VS.NET里创建名字为HierarchicalDataGrid的VB.NET ASPX应用程序，输入上面的代码，就可以看到下面的结果：
ASP.NET 2.0版本代码 C# <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Test_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form runat="server">
<asp:DataGrid ID="DataGrid1" BorderColor="#0099FF" runat="server" ShowHeader="False"
Width="470px" CellPadding="0" CellSpacing="0" AutoGenerateColumns="False" BorderWidth="2px"
OnItemDataBound="DataGrid1_ItemDataBound">
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<table cellspacing="0" cellpadding="0" width="100%" border="0">
<tr>
<td bgcolor="#FF6600">
<b>订单号：
<%# Eval("OrderID") %>
</b>
</td>
</tr>
<tr>
<td align="right">
<asp:DataGrid ID="DataGrid2" runat="server" AutoGenerateColumns="False" BorderColor="#33FF33"
DataKeyField="OrderID" DataSource='<%# ((System.Data.DataRowView)Container.DataItem).CreateChildView("OrderRelation") %>'>
<HeaderStyle Font-Bold="True" ForeColor="#CC0066" BackColor="#FFCCFF"></HeaderStyle>
<Columns>
<asp:BoundColumn Visible="False" DataField="OrderID" ReadOnly="True"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="产品名称">
<HeaderStyle Width="300px"></HeaderStyle>
<ItemTemplate>
<%# Eval("ProductName") %>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="UnitPrice" HeaderText="单价"></asp:BoundColumn>
<asp:BoundColumn DataField="Quantity" HeaderText="数量"></asp:BoundColumn>
<asp:BoundColumn DataField="Discount" HeaderText="折扣"></asp:BoundColumn>
</Columns>
</asp:DataGrid></td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
public partial class _Test_Default : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e )
{
SqlConnection OrdersConnection = new SqlConnection(@"User ID=sa;Password=;Initial Catalog=NorthWind;Server=(local)");
SqlDataAdapter OrderAdapter = new SqlDataAdapter("Select * from Orders; select OrderID ,Products.ProductName,
[order Details].Unitprice,[order Details].Quantity,[order Details].discount from [order Details],Products
where [Order Details].ProductId=Products.ProductID", OrdersConnection);
DataSet OrderDataSet = new DataSet();
OrderAdapter.Fill(OrderDataSet);
OrderDataSet.Tables[0].TableName = "Orders";
OrderDataSet.Tables[1].TableName = "Order Details";
DataColumn Parent = OrderDataSet.Tables["Orders"].Columns["OrderID"];
DataColumn Child = OrderDataSet.Tables["Order Details"].Columns["OrderID"];
DataRelation OrderRelation = new DataRelation("OrderRelation", Parent, Child, false);
OrderDataSet.Relations.Add(OrderRelation);
DataGrid1.DataSource = OrderDataSet.Tables["Orders"].DefaultView;
DataBind();
}
protected void DataGrid1_ItemDataBound( object sender, DataGridItemEventArgs e )
{
e.Item.Cells[0].BackColor = System.Drawing.Color.Ivory;
}
}
VB.NET <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default3.aspx.vb" Inherits="Default3" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>无标题页</title>
</head>
<body>
<form id="Form1" runat="server">
<asp:DataGrid ID="DataGrid1" BorderColor="#0099FF" runat="server" ShowHeader="False"
Width="470px" CellPadding="0" CellSpacing="0" AutoGenerateColumns="False" BorderWidth="2px">
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<table cellspacing="0" cellpadding="0" width="100%" border="0">
<tr>
<td bgcolor="#FF6600">
<b>订单号：
<%# Eval("OrderID") %>
</b>
</td>
</tr>
<tr>
<td align="right">
<asp:DataGrid ID="DataGrid2" runat="server" AutoGenerateColumns="False" BorderColor="#33FF33"
DataKeyField="OrderID" DataSource='<%# CType(Container.DataItem,System.Data.DataRowView).CreateChildView("OrderRelation") %>'>
<HeaderStyle Font-Bold="True" ForeColor="#CC0066" BackColor="#FFCCFF"></HeaderStyle>
<Columns>
<asp:BoundColumn Visible="False" DataField="OrderID" ReadOnly="True"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="产品名称">
<HeaderStyle Width="300px"></HeaderStyle>
<ItemTemplate>
<%# Eval("ProductName") %>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="UnitPrice" HeaderText="单价"></asp:BoundColumn>
<asp:BoundColumn DataField="Quantity" HeaderText="数量"></asp:BoundColumn>
<asp:BoundColumn DataField="Discount" HeaderText="折扣"></asp:BoundColumn>
</Columns>
</asp:DataGrid></td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
Partial Class Default3
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim OrdersConnection As System.Data.SqlClient.SqlConnection =
New System.Data.SqlClient.SqlConnection("User ID=sa;Password=;Initial Catalog=NorthWind;Server=(local)")
Dim OrderAdapter As System.Data.SqlClient.SqlDataAdapter = New
System.Data.SqlClient.SqlDataAdapter("Select * from Orders; select OrderID ,Products.ProductName,
[order Details].Unitprice,[order Details].Quantity,[order Details].discount from [order Details],
Products where [Order Details].ProductId=Products.ProductID", OrdersConnection)
Dim OrderDataSet As System.Data.DataSet = New System.Data.DataSet()
OrderAdapter.Fill(OrderDataSet)
OrderDataSet.Tables(0).TableName = "Orders"
OrderDataSet.Tables(1).TableName = "Order Details"
Dim Parent As System.Data.DataColumn = OrderDataSet.Tables("Orders").Columns("OrderID")
Dim Child As System.Data.DataColumn = OrderDataSet.Tables("Order Details").Columns("OrderID")
Dim OrderRelation As System.Data.DataRelation = New System.Data.DataRelation("OrderRelation", Parent, Child, False)
OrderDataSet.Relations.Add(OrderRelation)
DataGrid1.DataSource = OrderDataSet.Tables("Orders").DefaultView
DataBind()
End Sub
Protected Sub DataGrid1_ItemDataBound(ByVal sender As Object,
ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
e.Item.Cells(0).BackColor = System.Drawing.Color.Ivory
End Sub
End Class
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利用ASP.NET DataGrid显示主次关系的数据
最新推荐文章于 2013-08-13 10:35:29 发布
本文介绍如何使用ASP.NET和VB.NET在DataGrid中显示带有主次结构的数据，通过实例展示了如何从Northwind数据库获取订单及其详细信息，并利用DataRelation建立父子关系。
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