в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

Admin: 1 версия

2010-05-26T12:00:36Z

1 версия

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== Hidden fields and ViewState (C#)==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 id="Head1" runat="server">
<title>Hidden Fields and ViewState</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
<asp:Button ID="Button1" Runat="server" Text="Button" />
<asp:HiddenField ID="HiddenField1" Runat="server" />
</div>
</form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
[Serializable]
public class Person
{
public string firstName;
public string lastName;
}
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
HiddenField1.Value = "foo";
ViewState["AnotherHiddenValue"] = "bar";
Person p = new Person();
p.firstName = "Scott";
p.lastName = "Hanselman";
ViewState["HiddenPerson"] = p;
}
}
}</source>

== Hidden fields and ViewState (VB)==



<source lang="csharp">
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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 id="Head1" runat="server">
<title>Hidden Fields and ViewState</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
<asp:Button ID="Button1" Runat="server" Text="Button" />
<asp:HiddenField ID="HiddenField1" Runat="server" />
</div>
</form>
</body>
</html>
File: Default.aspx.vb
<Serializable()> _
Public Class Person
Public firstName As String
Public lastName As String
End Class
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Me.Load
If Not Page.IsPostBack Then
HiddenField1.Value = "foo"
ViewState("AnotherHiddenValue") = "bar"
Dim p As New Person
p.firstName = "Scott"
p.lastName = "Hanselman"
ViewState("HiddenPerson") = p
End If
End Sub
End Class</source>

== Use hidden field to pass value==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="HiddenFieldTest" %>
<!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 id="Head1" runat="server">
<title>HiddenField Test</title>
<style type="text/css">
#left { float: left; width: 200px; }
#right { float: right; width: 200px; }
</style>
</head>
<body>
<form id="form1" runat="server">
<div id="container">
<h1>HiddenField Test</h1>
Click multiple times on these two images
<div id="left">
<div class="box">
<asp:ImageButton ID="ibtnImage1"
runat="server"
ImageUrl="http://www.nfex.ru/style/logo.png"
AlternateText="Click on me"
OnClick="ibtnImage1_Click" />
<asp:Label ID="labMessage1" runat="server" />
</div>
</div>
<div id="right">
<div class="box">
<asp:ImageButton ID="ibtnImage2"
runat="server"
ImageUrl="http://www.nfex.ru/style/logo.png"
AlternateText="Click on me"
OnClick="ibtnImage2_Click" />
<asp:Label ID="labMessage2" runat="server" />
</div>
</div>
<asp:HiddenField ID="hfImage1" runat="server" />
<asp:HiddenField ID="hfImage2" runat="server" />
</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 HiddenFieldTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
hfImage1.Value = "0";
hfImage2.Value = "0";
}
}
protected void ibtnImage1_Click(object sender, EventArgs e)
{
IncrementCount(hfImage1);
labMessage1.Text = "# Clicks: " + hfImage1.Value;
}
protected void ibtnImage2_Click(object sender, EventArgs e)
{
IncrementCount(hfImage2);
labMessage2.Text = "# Clicks: " + hfImage2.Value;
}
private void IncrementCount(HiddenField hf)
{
int count = Convert.ToInt32(hf.Value);
count++;
hf.Value = count.ToString();
}
}</source>

== Working with the HiddenField server control (C#)==



<source lang="csharp">
<%@ Page Language="C#"%>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
HiddenField1.Value = System.Guid.NewGuid().ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>HiddenField Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:HiddenField ID="HiddenField1" Runat="Server" />
</form>
</body>
</html></source>

== Working with the HiddenField server control (VB)==



<source lang="csharp">
<%@ Page Language="VB" %>
<script runat="server" language="vb">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
HiddenField1.Value = System.Guid.NewGuid().ToString()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>HiddenField Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:HiddenField ID="HiddenField1" Runat="Server" />
</form>
</body>
</html></source>

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ASP.NET Tutorial/ASP.net Controls/HiddenField - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия