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管理列的多視圖3.3.2
動態加載模板的能力，用戶可定制列的視圖
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.頁面
<%@ 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.代碼
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 的摘要說明。
/// </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;//保存數據集
oDS.Dispose();
oDS=null;
oCMD.Dispose();
oCMD=null;
}
//序列化到XML文件(寫入)
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(讀出)
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 窗體設計器生成的代碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </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");//在當前的空器中搜索控件
dv.Sort=dd.SelectedItem.Value;
//保留當前選定的下拉列表項
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;//獲得被創建項的類型
if(elemType==ListItemType.Header)
{
//創建下拉列表控件
DropDownList dd=new DropDownList();
dd.ID="ddSort";
ListItem li1,li2,li3;
//ListItem構造函數獲得項的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);
//選最后一次選擇的項(如果有的話)
if(ViewState["FieldIndex"]==null)
{
dd.SelectedIndex=0;
}
else
{
dd.SelectedIndex=Convert.ToInt32(ViewState["FieldIndex"]);
}
//向第二個標題中添加下拉列表
TableCell cell1=(TableCell)e.Item.Controls[1];
cell1.Controls.Add(dd);
}
else if(elemType==ListItemType.Footer)
{
//將前三列的腳注合并
e.Item.Cells.RemoveAt(0);
e.Item.Cells.RemoveAt(1);
e.Item.Cells[0].ColumnSpan=3;
//用可用視圖填充下拉列表
//每個視圖對應一個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 可以區分不同的元素
if(e.CommandName=="ApplyView")
{
//檢查下拉列表的有效實例
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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