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datagrid嵌套和资源消耗

作者：菜鸟追梦旅行 | 2024-05-28 22:11:55

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datagrid嵌套和资源消耗

datagrid嵌套的文章很多了。

我这里参考的是以下两篇

http://www.cnblogs.com/lovecherry/archive/2005/04/26/145633.html

http://www.microsoft.com/china/MSDN/library/data/dataAccess/NestGridHierData.mspx

我只是做了datagrid的嵌套，并没有动态添加模板列那么复杂。

最后的代码给大家。有一部分是vs生成的，懒的写。

@ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="test1.WebForm2" %>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

< HTML >

< HEAD >

< title > WebForm2 </ title >

< meta content ="Microsoft Visual Studio .NET 7.1" name ="GENERATOR" >

< meta content ="C#" name ="CODE_LANGUAGE" >

< meta content ="JavaScript" name ="vs_defaultClientScript" >

< meta content ="http://schemas.microsoft.com/intellisense/ie5" name ="vs_targetSchema" >

</ HEAD >

< body >

< form id ="Form1" method ="post" runat ="server" >

< asp:datagrid id =DataGrid1 runat ="server" AutoGenerateColumns ="False" DataSource ="<%# dataSet1 %>" >

< Columns >

< asp:BoundColumn DataField ="EmployeeID" HeaderText ="编号" ></ asp:BoundColumn >

< asp:TemplateColumn HeaderText ="测试列" >

< ItemTemplate >

< asp:DataGrid id ="DataGrid2" runat ="server" AutoGenerateColumns ="False" >

< Columns >

< asp:BoundColumn DataField ="TerritoryID" HeaderText ="编号" ></ asp:BoundColumn >

</ Columns >

</ asp:DataGrid >

</ ItemTemplate >

</ asp:TemplateColumn >

</ Columns >

</ asp:datagrid >

< asp:DataGrid id ="DataGrid3" runat ="server" AutoGenerateColumns ="False" >

< Columns >

< asp:BoundColumn DataField ="TerritoryID" HeaderText ="标号" ></ asp:BoundColumn >

</ Columns >

</ asp:DataGrid ></ form >

</ body >

</ HTML >

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace test1

{

/**//// <summary>

/// WebForm2 的摘要说明。

/// </summary>

public class WebForm2 : System.Web.UI.Page

{

protected System.Data.SqlClient.SqlDataAdapter sqlDataAdapter1;

protected System.Data.SqlClient.SqlCommand sqlSelectCommand1;

protected System.Data.SqlClient.SqlCommand sqlInsertCommand1;

protected System.Data.SqlClient.SqlCommand sqlUpdateCommand1;

protected System.Data.SqlClient.SqlCommand sqlDeleteCommand1;

protected System.Data.SqlClient.SqlConnection sqlConnection1;

protected System.Data.DataSet dataSet1;

protected System.Web.UI.WebControls.DataGrid DataGrid3;

protected System.Web.UI.WebControls.DataGrid DataGrid1;

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

{

// 在此处放置用户代码以初始化页面

if(!IsPostBack)

{

sqlDataAdapter1.Fill(dataSet1);

DataGrid3.DataSource=BindGrid2(1);

DataGrid1.DataBind();

DataGrid3.DataBind();

}

Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

/**//// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.sqlDataAdapter1 = new System.Data.SqlClient.SqlDataAdapter();

this.sqlDeleteCommand1 = new System.Data.SqlClient.SqlCommand();

this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();

this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();

this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();

this.sqlUpdateCommand1 = new System.Data.SqlClient.SqlCommand();

this.dataSet1 = new System.Data.DataSet();

((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();

// sqlDataAdapter1

this.sqlDataAdapter1.DeleteCommand = this.sqlDeleteCommand1;

this.sqlDataAdapter1.InsertCommand = this.sqlInsertCommand1;

this.sqlDataAdapter1.SelectCommand = this.sqlSelectCommand1;

this.sqlDataAdapter1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[]

{

new System.Data.Common.DataTableMapping("Table", "Employees", new System.Data.Common.DataColumnMapping[]

{

new System.Data.Common.DataColumnMapping("EmployeeID", "EmployeeID")})});

this.sqlDataAdapter1.UpdateCommand = this.sqlUpdateCommand1;

// sqlDeleteCommand1

this.sqlDeleteCommand1.CommandText = "DELETE FROM Employees WHERE (EmployeeID = @Original_EmployeeID)";

this.sqlDeleteCommand1.Connection = this.sqlConnection1;

this.sqlDeleteCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_EmployeeID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "EmployeeID", System.Data.DataRowVersion.Original, null));

// sqlConnection1

this.sqlConnection1.ConnectionString = "workstation id=李征;packet size=4096;user id=fa;pwd=fa;data source=李征;persist secur" +

"ity info=False;initial catalog=Northwind";

// sqlInsertCommand1

this.sqlInsertCommand1.CommandText = "INSERT INTO Employees() VALUES (); SELECT EmployeeID FROM Employees WHERE (Employ" +

"eeID = @@IDENTITY)";

this.sqlInsertCommand1.Connection = this.sqlConnection1;

// sqlSelectCommand1

this.sqlSelectCommand1.CommandText = "SELECT EmployeeID FROM Employees";

this.sqlSelectCommand1.Connection = this.sqlConnection1;

// sqlUpdateCommand1

this.sqlUpdateCommand1.CommandText = "UPDATE Employees SET WHERE (EmployeeID = @Original_EmployeeID); SELECT EmployeeID" +

" FROM Employees WHERE (EmployeeID = @EmployeeID)";

this.sqlUpdateCommand1.Connection = this.sqlConnection1;

this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_EmployeeID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "EmployeeID", System.Data.DataRowVersion.Original, null));

this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@EmployeeID", System.Data.SqlDbType.Int, 4, "EmployeeID"));

// dataSet1

this.dataSet1.DataSetName = "NewDataSet";

this.dataSet1.Locale = new System.Globalization.CultureInfo("zh-CN");

this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);

this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);

this.Load += new System.EventHandler(this.Page_Load);

((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();

}

#endregion

private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

{

}

private DataView BindGrid2(int EmployeeID)

{

SqlConnection myconn=new SqlConnection();

myconn.ConnectionString="workstation id=李征;packet size=4096;user id=fa;pwd=fa;data source=李征;persist secur" +

"ity info=False;initial catalog=Northwind";

SqlDataAdapter myda=new SqlDataAdapter("select TerritoryID from EmployeeTerritories where EmployeeID="+EmployeeID.ToString(),myconn);

DataSet ds=new DataSet();

myda.Fill(ds);

return ds.Tables[0].DefaultView;

}

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

{

if ( e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

{

DataGrid dgt = (DataGrid)e.Item.FindControl("DataGrid2");

dgt.DataSource=BindGrid2(int.Parse(e.Item.Cells[0].Text.ToString()));

dgt.DataBind();

//Label lb=(Label)e.Item.FindControl("l1");

//lb.Text="111";

}

挑重点看看吧。。。

再说到资源消耗，这么嵌套真有点资源杀手的味道。大部分资源都消耗在对控件的消耗上了。

真难想象再象我引用文章那样的给嵌套的dtatgrid在动态创建列会怎样。

转载于:https://www.cnblogs.com/jpwar/archive/2005/09/14/236451.html

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