в 15:30, 26 мая 2010

2010-05-26T15:30:47Z

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2010-05-26T11:53:53Z

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==Creating ViewState-Enabled Control Properties (C#)==



<source lang="csharp">
<%@ Page language="C#" %>
<%@ Register TagPrefix="Control" Namespace="Control" Assembly="Control" %>
<script language="C#" runat="server">
void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Random rand = new Random();
ViewStateControl1.Text = rand.Next(1,100).ToString();
}
}
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
<head>
<title>Creating ViewState-Enabled Control Properties</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<Control:ViewStateControl id="ViewStateControl1" runat="server" />
<asp:linkbutton text="PostBack test" runat="server" />
</form>
</body>
</html>
File: Control.cs
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ruponentModel;
namespace Control
{
[DefaultProperty("Text"),
ToolboxData("<{0}:ViewStateControl runat=server></{0}:ViewStateControl>")]
public class ViewStateControl : System.Web.UI.WebControls.WebControl
{
public string Text
{
get
{
string text = (string) ViewState["Text"];
return (text == null)? string.Empty : text;
}
set
{
ViewState["Text"] = value;
}
}
protected override void Render(HtmlTextWriter writer)
{
writer.Write(Text);
}
}
}
</source>

==Creating ViewState-Enabled Control Properties (VB)==



<source lang="csharp">
<%@ Page language="VB" %>
<%@ Register TagPrefix="Control" Namespace="Control" Assembly="Control" %>
<script language="VB" runat="server">
Sub Page_Load(Sender As Object, E As EventArgs)
If Not IsPostBack Then
Dim RandomGenerator As Random
RandomGenerator = New Random(DateTime.Now.Millisecond)
ViewStateControl1.Text = RandomGenerator.Next(1,100)
End If
End Sub
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
<body ms_positioning="GridLayout">
<form id="Form1" method="post" runat="server">
<Control:viewstatecontrol id="ViewStateControl1" runat="server" />
<asp:linkbutton text="PostBack test" runat="server" id="Linkbutton1" />
</form>
</body>
</html>

File: Default.vb
Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.ruponentModel
Namespace Control
Public Class ViewStateControl
Inherits System.Web.UI.WebControls.WebControl
Public Property Text() As String
Get
Dim _text As String = CStr(ViewState("Text"))
If _text Is Nothing Then
Return String.Empty
Else
Return _text
End If
End Get
Set(ByVal Value As String)
ViewState("Text") = Value
End Set
End Property
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
writer.Write(Text)
End Sub
End Class
End Namespace
</source>

==User control with readonly properties==



<source lang="csharp">
<%@ Page %>
<%@ Register TagPrefix="uc1" TagName="header" Src="Control.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>User Controls</title>
<Script language="C#" Runat="Server">
private void Page_Load(object sender, System.EventArgs e)
{
header1.Author = "Snoopy";
FooterLabel.Text = "Rendered " + header1.RenderDate;
}
</Script>
</HEAD>
<body>
<form id="dependingdropdowns" method="post" runat="server">
<uc1:header id="header1" runat="server" Title="A Tale of Mystery"></uc1:header>
<p>It was a dark and stormy night.</p>
<hr/>
<asp:Label ID="FooterLabel" Runat="server" />
</form>
</body>
</HTML>
File: Control.ascx
<%@ Control Language="c#" %>
<script runat="server">
private string title;
private string author;
private DateTime renderDate = System.DateTime.Now;
public string Title {
get {
return title;
}
set {
title = value;
}
}
public string Author {
get {
return author;
}
set {
author = value;
}
}
// ReadOnly
public DateTime RenderDate {
get {
return renderDate;
}
}
private void Page_Load(object sender, EventArgs e)
{
TitleLabel.Text = Title;
AuthorLabel.Text = Author;
}
</script>
<h1><asp:Label id="TitleLabel" runat="server" /></h1>
<h3><asp:Label id="AuthorLabel" runat="server" /></h1>
</source>

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ASP.Net/User Control and Master Page/Property - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия