从用户控件向页面中传递数据：
法一：使用Session传递。
1.在按钮点击时候，把值放到Session中去。
2.重写页面的OnLoadComplete方法，在这个方法中把值从Session中取出来。
注意：不要在Page_Load中取出Session 来。原因是：每次点击按钮的时候，Page_Load总是在按钮的Click之前触发。
法二：使用代理（委托 delegate）向页面传值
什么是代理？——代理是指向方法的指针。
代理与类非常相似但又很不相同。
类和对象：
第一步：使用class关键词定义一个新类
public class Ren
{
public void Speak()
{
....
}
}
第二步：使用这个类来定义变量。
private Ren r;
第三步：实例化Ren对象，把这个对象赋给栈里的变量
r = new Ren();
第四步：通过调用栈里的变量来实现对堆里的对象的操作。
r.xxxx
代理委托：
第一步：使用delegate关键词定义一个新的代理类型。
public delegate 代理的返回类型 代理名(参数列表);
public delete void ShowDelegate(string s);
第二步：使用上面的代理类型来定义代理变量。
private ShowDelegate Show;
第三步：指定一个函数，把这个函数赋给代理变量Show
void Haha(string aaa)
{
Console.WriteLine(aaa);
}
Show = new ShowDelegate(Haha);
第四步：使用代理调用指向的函数
Show("Hello");
两个用户控件，在页面上显示，代理实例：
用户控件1：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Seach1.ascx.cs" Inherits="Seach1" %>
<asp:Label ID="Label1" runat="server" Text="请输入："></asp:Label>
<asp:TextBox ID="txt" runat="server"></asp:TextBox>
<asp:Button ID="cha" runat="server" OnClick="cha_Click" Text="查询" />
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Seach1 : System.Web.UI.UserControl
{
private CarsDataContext context = new CarsDataContext();
public delegate void Showshuju(List<Car> list);
public Showshuju Showdele;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void cha_Click(object sender, EventArgs e)
{
var qu = context.Car.Where(p => p.Name.Contains(txt.Text));
if (Showdele != null)
{
Showdele(qu.ToList());
}
}
}
用户控件2：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Seach2.ascx.cs" Inherits="Seach2" %>
<asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" Width="100%">
<AlternatingRowStyle BackColor="White" />
<EditRowStyle BackColor="#2461BF" />
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#EFF3FB" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F5F7FB" />
<SortedAscendingHeaderStyle BackColor="#6D95E1" />
<SortedDescendingCellStyle BackColor="#E9EBEF" />
<SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Seach2 : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
public void BindCar(List<Car> list)
{
GridView1.DataSource = list;
GridView1.DataBind();
}
}
显示页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Seach-ye.aspx.cs" Inherits="Seach_ye" %>
<%@ Register src="Seach1.ascx" tagname="Seach1" tagprefix="uc1" %>
<%@ Register src="Seach2.ascx" tagname="Seach2" tagprefix="uc2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<uc1:Seach1 ID="Seach11" runat="server" />
<br />
<br />
<br />
<uc2:Seach2 ID="Seach21" runat="server" />
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Seach_ye : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Seach11.Showdele = new Seach1.Showshuju(Seach21.BindCar);
}
}
一个用户控件，在页面上显示，SESSION实例：
控件：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="kongjian.ascx.cs" Inherits="kongjian" %>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="控件（内）" />
<br />
<asp:Label ID="Label1" runat="server" Text="Label内"></asp:Label>
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class kongjian : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Session["aa"] = TextBox1.Text;
}
}
显示页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="页面.aspx.cs" Inherits="页面" %>
<%@ Register src="kongjian.ascx" tagname="kongjian" tagprefix="uc1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="外" />
<br />
<asp:Label ID="Label1" runat="server" Text="Label外"></asp:Label>
<div>
<br />
<uc1:kongjian ID="kongjian1" runat="server" />
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class 页面 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected override void OnLoadComplete(EventArgs e)
{
base.OnLoadComplete(e);
if (Session["aa"] != null)
{
TextBox1.Text = Session["aa"].ToString();
}
}
}
一个用户控件，在页面上显示代理实例：
控件：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="kongjian2.ascx.cs" Inherits="kongjian2" %>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="代理" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class kongjian2 : System.Web.UI.UserControl
{
public delegate void Showdele(string str);
public Showdele textdele;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (textdele != null)
{
textdele(TextBox1.Text);
}
}
}
显示页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="页面2.aspx.cs" Inherits="页面2" %>
<%@ Register src="kongjian2.ascx" tagname="kongjian2" tagprefix="uc1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="被代理" />
<br />
<br />
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<br />
<uc1:kongjian2 ID="kongjian21" runat="server" />
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class 页面2 : System.Web.UI.Page
{
private delegate void Textdele(string str);
private Textdele Deletext;
protected void Page_Load(object sender, EventArgs e)
{
kongjian21.textdele = new kongjian2.Showdele(setshow);
}
protected void Button1_Click(object sender, EventArgs e)
{
Deletext = new Textdele(Show);
Deletext("这个代理所做！");
}
public void Show(string s)
{
Label1.Text = s;
}
public void setshow(string s)
{
Label1.Text = s;
}
}