利用GridView显示主细表并添加打开、关闭功能_[Asp.Net教程]
本文例子使用嵌套的 GridView 来显示主细表，并使用 JavaScript 来控制明细表的显示与隐藏。值得注意的是：在 GridView 的 RowDataBound 的事件里，不要多次执行数据库的打开，否则，将很快会导致连接数已满的问题。
例子中的数据库，请参照《 ASP.NET 2.0应用开发技术》一书中附带的光盘中的数据库。
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代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridViewNested.aspx.cs" Inherits="Exam_GridViewNested" %>
利用GridView显示主细表并添加打开、关闭功能
CS:
using System;
using System.Data;
using System.Data.OleDb;
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 Exam_GridViewNested : System.Web.UI.Page
{
string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\aspxWeb.mdb;Persist Security Info=True";
OleDbConnection cn1;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
OleDbConnection cn = new OleDbConnection(ConnectionString);
cn.Open();
cn1 = new OleDbConnection(ConnectionString);
cn1.Open();
OleDbCommand cmd = new OleDbCommand("select * from [Subject]", cn);
OleDbDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
MasterGridView.DataSource = dr;
MasterGridView.DataBind();
dr.Close();
cmd.Dispose();
cn.Dispose();
cn1.Dispose();
cn = cn1 = null;
}
}
protected void MasterGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
GridView oGridView = (GridView)e.Row.FindControl("DetailGridView");
if (oGridView != null)
{
OleDbCommand cmd = new OleDbCommand("select top 10 * from Document Where pid = " + MasterGridView.DataKeys[e.Row.RowIndex].Value, cn1);
OleDbDataReader dr1 = cmd.ExecuteReader();
oGridView.DataSource = dr1;
oGridView.DataBind();
dr1.Close();
cmd.Dispose();
}
}
}
}
VB.NET:
Private ConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\aspxWeb.mdb;Persist Security Info=True"
Private cn1 As OleDbConnection
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If Not Page.IsPostBack Then
Dim cn As OleDbConnection = New OleDbConnection(ConnectionString)
cn.Open
cn1 = New OleDbConnection(ConnectionString)
cn1.Open
Dim cmd As OleDbCommand = New OleDbCommand("select * from [Subject]", cn)
Dim dr As OleDbDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)
MasterGridView.DataSource = dr
MasterGridView.DataBind
dr.Close
cmd.Dispose
cn.Dispose
cn1.Dispose
cn = cn1 = Nothing
End If
End Sub
Protected Sub MasterGridView_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim oGridView As GridView = CType(e.Row.FindControl("DetailGridView"), GridView)
If Not (oGridView Is Nothing) Then
Dim cmd As OleDbCommand = New OleDbCommand("select top 10 * from Document Where pid = " + MasterGridView.DataKeys(e.Row.RowIndex).Value, cn1)
Dim dr1 As OleDbDataReader = cmd.ExecuteReader
oGridView.DataSource = dr1
oGridView.DataBind
dr1.Close
cmd.Dispose
End If
End If
End Sub
来源:孟宪会之精彩世界
