📄 可定制列的视图.txt

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管理列的多视图3.3.2

动态加载模板的能力，用户可定制列的视图

a2.ascx
<%@ Language="c#" %>
<%# 
DataBinder.Eval(((DataGridItem)Container).DataItem,"LastName")
%>
a1.ascx
<%@ Language="c#" %>
<%# 
DataBinder.Eval(((DataGridItem)Container).DataItem,"titleofcourtesy")+
"<b>"+
DataBinder.Eval(((DataGridItem)Container).DataItem,"LastName")+
"</b>"+","+
DataBinder.Eval(((DataGridItem)Container).DataItem,"FirstName") 
%>
1.页面
<%@ Page language="c#" Codebehind="MySortGrid4.aspx.cs" AutoEventWireup="false" Inherits="Co_112.MySortGrid4" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
	<HEAD>
		<title>MySortGrid</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 MS_POSITIONING="GridLayout">
		<form id="Form1" method="post" runat="server">
			<asp:datagrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 72px; POSITION: absolute; TOP: 80px" runat="server"
				AutoGenerateColumns="False" AllowSorting="True" ShowFooter="True">
				<Columns>
					<asp:BoundColumn DataField="employeeid" HeaderText="ID"></asp:BoundColumn>
					<asp:TemplateColumn SortExpression="*" HeaderText="Sort by">
						<ItemTemplate>
							<asp:Label id=Label1 runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"titleofcourtesy")+"<b>"+DataBinder.Eval(Container.DataItem,"LastName")+"</b>"+","+DataBinder.Eval(Container.DataItem,"FirstName") %>'>Label</asp:Label>
						</ItemTemplate>
						<FooterTemplate>
							<b>View:</b>
							<asp:DropDownList id="ddViews" runat="server"></asp:DropDownList>
							<asp:LinkButton id="LinkButton1" runat="server" CommandName="ApplyView">Apply</asp:LinkButton>
						</FooterTemplate>
					</asp:TemplateColumn>
					<asp:BoundColumn DataField="Title" HeaderText="Position"></asp:BoundColumn>
					<asp:BoundColumn DataField="country" HeaderText="From"></asp:BoundColumn>
				</Columns>
			</asp:datagrid></form>
	</body>
</HTML>
2.代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Xml;
namespace Co_112
{
	/// <summary>
	/// MySortGrid 的摘要说明。
	/// </summary>
	public class MySortGrid4: System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				Display();
			}
		}
		private void Display()
		{
			string strConn,strCmd;
			strConn="server=localhost;uid=sa;pwd=;database=Northwind";
			strCmd="Select titleofcourtesy,employeeid,firstName,lastName,country,title From employees";
			SqlDataAdapter oCMD=new SqlDataAdapter(strCmd,strConn);
			DataSet oDS=new DataSet();
			oCMD.Fill(oDS,"MyList");
			DataTable dt=oDS.Tables["MyList"];				
			DataGrid1.DataSource=oDS.Tables["MyList"];
			DataGrid1.DataBind();
			Session["MyDataSet"]=oDS;//保存数据集
			oDS.Dispose();
			oDS=null;
			oCMD.Dispose();
			oCMD=null;
		}
		//序列化到XML文件(写入)
		private void SerializeDataSource(DataSet ds)
		{
			string strFile=Server.MapPath(Session.SessionID+".xml");
			XmlTextWriter xtw=new XmlTextWriter(strFile,null);
			ds.WriteXml(xtw);
			xtw.Close();			
		}
		//反序列XML文件(读出)
		private DataSet DeserializeDataSource()
		{
			string strFile=Server.MapPath(Session.SessionID+".xml");
			XmlTextReader xtr=new XmlTextReader(strFile);
			DataSet ds=new DataSet();
			ds.ReadXml(xtr);
			xtr.Close();
			return ds;
		}


		#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.DataGrid1.ItemCreated += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemCreated);
			this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
			this.DataGrid1.SortCommand += new System.Web.UI.WebControls.DataGridSortCommandEventHandler(this.DataGrid1_SortCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DataGrid1_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
		{			
			DataSet ds=(DataSet)Session["MyDataSet"];
			DataView dv=ds.Tables["MyList"].DefaultView;
			if(e.SortExpression!="*")
				dv.Sort=e.SortExpression;
			else
			{
				DataGridItem dgi=(DataGridItem)e.CommandSource;
				DropDownList dd=(DropDownList)dgi.FindControl("ddSort");//在当前的空器中搜索控件
				dv.Sort=dd.SelectedItem.Value;
				//保留当前选定的下拉列表项
				ViewState["FieldIndex"]=dd.SelectedIndex.ToString();			
			}
			DataGrid1.DataSource=dv;
			DataGrid1.DataBind();
		}		

		private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
		{
			ListItemType elemType=e.Item.ItemType;//获得被创建项的类型
			if(elemType==ListItemType.Header)
			{
				//创建下拉列表控件
				DropDownList dd=new DropDownList();
				dd.ID="ddSort";
				ListItem li1,li2,li3;
				//ListItem构造函数获得项的Text和Value值
				li1=new ListItem("Title of courtesy","titleofcourtesy");
				dd.Items.Add(li1);
				li2=new ListItem("Last Name","lastname");
				dd.Items.Add(li2);
				li3=new ListItem("First Name","firstname");
				dd.Items.Add(li3);
				//选最后一次选择的项(如果有的话)
				if(ViewState["FieldIndex"]==null)
				{
					dd.SelectedIndex=0;
				}
				else
				{
					dd.SelectedIndex=Convert.ToInt32(ViewState["FieldIndex"]);
				}
				//向第二个标题中添加下拉列表
				TableCell cell1=(TableCell)e.Item.Controls[1];
				cell1.Controls.Add(dd); 
			}
			else if(elemType==ListItemType.Footer)
			{
				//将前三列的脚注合并
				e.Item.Cells.RemoveAt(0);
				e.Item.Cells.RemoveAt(1);
				e.Item.Cells[0].ColumnSpan=3;
				//用可用视图填充下拉列表
				//每个视图对应一个ASCX文件
				DropDownList ddViews=(DropDownList)e.Item.FindControl("ddViews");
				ListItem l;
				l=new ListItem("Ms.Surname,Name","a1.ascx");
				ddViews.Items.Add(l);
				l=new ListItem("Name Surname-(Ms.)","a2.ascx");
				ddViews.Items.Add(l);
				ddViews.SelectedIndex=Convert.ToInt32(ViewState["ViewIndex"]);
			}
		}

		private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			//CommandName 可以区分不同的元素
			if(e.CommandName=="ApplyView")
			{
				//检查下拉列表的有效实例
				DropDownList ddViews=(DropDownList)e.Item.FindControl("ddViews");
				string strFile=ddViews.SelectedItem.Value;
				ViewState["CurrentViewFile"]=strFile;
				ViewState["ViewIndex"]=ddViews.SelectedIndex.ToString();
				UpdateView();
			}
		}
		private void UpdateView()
		{
			TemplateColumn tc=(TemplateColumn)DataGrid1.Columns[1];
			tc.ItemTemplate=Page.LoadTemplate((string)ViewState["CurrentViewFile"]);

			DataSet ds=(DataSet)Session["MyDataSet"];
			DataView dv=ds.Tables["MyList"].DefaultView;
			DataGrid1.DataSource=dv;
			DataGrid1.DataBind();
		}
	}
}
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