ASP.NET Tutorial/Page Lifecycle/Controls — различия между версиями

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Текущая версия на 12:00, 26 мая 2010

Add a control to a page dynamically

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="DynamicButton" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
          <asp:Panel id="Panel1" runat="server" Width="364px" Height="142px">
        
          <asp:Label id=Label1 runat="server">(No value.)</asp:Label>
        
          <asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>
          <asp:Button id="cmdReset" runat="server" Width="112px" Text="Reset Text" OnClick="cmdReset_Click"></asp:Button><br/>
        
          <hr/>
      </asp:Panel>
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Data;
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.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class DynamicButton : System.Web.UI.Page
{
    private void Page_Load(object sender, EventArgs e)
    {
    Button newButton = new Button();
    newButton.Text = "Dynamic Button";
    newButton.ID = "newButton";
    newButton.Click += new System.EventHandler(this.Button_Click);
    PlaceHolder1.Controls.Add(newButton);
    }
  protected void Button_Click(object sender, System.EventArgs e)
  {
    Label1.Text = "You clicked the dynamic button.";
  }
  protected void cmdReset_Click(object sender, System.EventArgs e)
  {
    Label1.Text = "(No value.)";
  }
  protected void cmdRemove_Click(object sender, System.EventArgs e)
  {
    Button foundButton = (Button)Page.FindControl("newButton");
    if (foundButton != null)
    {
      foundButton.Parent.Controls.Remove(foundButton);
    }
  }
}


Controls.Count

<%@ Page Language="vb" %>
<html>
   <head>
      <title>Controls collection example</title>
      <script runat="server">
         Sub Page_Load()
            Message.Text = "There are currently " & Controls.Count & _
               " controls on the page.<br/>"
            Dim Message2 As New Label
            Controls.AddAt(Controls.Count - 1, Message2)
            Message2.Text = "There are now " & Controls.Count & _
               " controls on the page."
         End Sub
      </script>
   </head>
<body>
   <asp:label id="Message" runat="server"/>
</body>
</html>


Grab Browser Info

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Grab Browser Info</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="I"m a Button" 
            ie:Text="IE Button" 
            mozilla:Text="Firefox Button" /> &nbsp;
        <asp:CheckBox ID="CheckBox1" runat="server" Text="I"m a CheckBox" 
            ie:Text="IE CheckBox" 
            mozilla:Text="Firefox CheckBox" /> &nbsp;
    </div>
    </form>
    
</body>
</html>


Use the input focus capability of ASP.NET 2.0 and superior

<%@ Page language="C#" %>
<script runat="server">
   void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
           this.SetFocus("Pswd");
   }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Focus to the control</title>
</head>
<body>
    <div id="pageContent">
        <form id="Form1" runat="server">
            <h1>Please, login</h1>
            <h3>User</h3>
            <asp:textbox runat="server" id="UserName" text="" /><br />
            <h3>Password</h3>
            <asp:textbox runat="server" id="Pswd" text="" TextMode="Password" /><br />
            <asp:button runat="server" id="Login" text="Log in" />
            <hr />
        </form>
    </div>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Page_Lifecycle/Controls&oldid=3225»