ASP.NET Tutorial/ASP.net Controls/Label

Содержание

1 Add style to asp:Label
2 Change asp:Label Text in page load event listener (VB.net)
3 Format a Label with CSS
4 Highlight with regular expression
5 Import properties of The Label control
6 Label controls are used to label the two TextBox controls.
7 Label font
8 Label hot key
9 Set Label through code (VB)
10 Set text to Label (C#)
11 Use asp:Label to display text message (VB.net)
12 Use of AssociatedControlID property on labels to bind a particular label to an input control
13 Using the Label server control to provide hot-key functionality

Add style to asp:Label

<%@ 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>Untitled Page</title>
    <style rel="stylesheet" type="text/css">
body
{
  font-family: Verdana, Arial, Sans-Serif;
  font-size: small;
}
.heading1
{
  font-weight: bold;
  font-size: large;
  color: lime;
}
.heading2
{
  font-weight: bold;
  font-size: medium;
  font-style: italic;
  color: #C0BA72;
}
.blockText
{
  padding: 10px;
  background-color: #FFFFD9;
  border-style: solid;
  border-width: thin;
}
    
    
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label CssClass="heading1" ID="Label1" runat="server" Text="This Label Uses heading1"></asp:Label>
        <br />
        This is sample unformatted text.<br />
        &nbsp;<br />
        <asp:Label CssClass="heading2" ID="Label2" runat="server" Text="This Label Uses heading2"></asp:Label>
        <br />
        Here"s more unformatted text.<br />
        <br />
        &nbsp;<div class="blockText" id="DIV1" runat="server" >
            This control uses the blockText style. This control uses the blockText style. This
            control uses the blockText style. This control uses the blockText style.
        </div>
    </div>   
    </form>
</body>
</html>

Change asp:Label Text in page load event listener (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
   sub Page_Load(obj as object, e as eventargs)
      lblMessage.Text = "This is my first exercise!"
   end sub   
</script>
<html><body>
   <asp:Label id="lblMessage" runat="server"/>
</body></html>

Format a Label with CSS

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <style type="text/css">
        div
        {
            padding:10px;
        }
        .labelStyle
        {
            color:red;
            background-color:yellow;
            border:Solid 2px Red;
        }
    </style>
    <title>Format Label</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblFirst"
        Text="First Label"
        ForeColor="Red"
        BackColor="Yellow"
        BorderStyle="Solid"
        BorderWidth="2"
        BorderColor="red"
        Runat="server" />
    <br />
    <asp:Label
        id="lblSecond"
        Text="Second Label"
        CssClass="labelStyle"
        Runat="server" />
    </div>
    </form>
</body>
</html>

Highlight with regular expression

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Highlighting" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Sample Search Highlighting</title>
   <style type="text/css">
      .myPanel { margin: 8pt; width: 50%; padding 10pt;  }
      body { font-family: Tahoma, Arial; font-size: 10pt;}
    </style>
</head>
<body>
   <form id="form1" runat="server">
      <asp:Panel ID="panSearch" runat="server" GroupingText="Search" CssClass="myPanel">
         Enter Search expression:
         <asp:TextBox ID="txtSearch" runat="server"></asp:TextBox><br />
         <asp:Button ID="btnSearch" runat="server" OnClick="btnSearch_Click" Text="Search" />
      </asp:Panel>
      <asp:Panel ID="panContent" runat="server" GroupingText="Content" CssClass="myPanel">
         <asp:Label ID="labContent" runat="server" />
      </asp:Panel>
   </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;

using System.Text.RegularExpressions;
public partial class Highlighting : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       labContent.Text = "Client-side validation is useful because it reduces round-trips to the server. This provides immediate feedback to the user as well as improves server performance. Unfortunately, client-side validation by itself is not sufficient. The user could be using a browser that does not support scripting (that is, using an ancient browser or has scripting turned off via the browser preferences). As well, client-side scripting is potentially vulnerable to script exploits. These can happen when a malicious user enters a javascript &lt;script&gt; block into a text field that can later cause harm when the entered data is echoed back to the browser.";
    }
   protected void btnSearch_Click(object sender, EventArgs e)
   {
      Regex myreg = new Regex(txtSearch.Text, RegexOptions.IgnoreCase);
      labContent.Text = myreg.Replace(labContent.Text, new MatchEvaluator(ReplaceSearchWord));
   }
   public string ReplaceSearchWord(Match m)
   {
      return "<span style="font-weight:bold; background: yellow;">" + m.Value + "</span>";
   }
}

Import properties of The Label control

BackColor:      change the background color of the label.
BorderColor:    set the color of a border rendered around the label.
BorderStyle:    display a border around the label. Possible values are NotSet, None, Dotted, Dashed, Solid, Double, Groove, Ridge, Inset, and Outset.
BorderWidth:    set the size of a border rendered around the label.
CssClass:       associate a Cascading Style Sheet class with the label.
Font:           set the label"s font properties.
ForeColor:      set the color of the content rendered by the label.
Style:          assign style attributes to the label.
ToolTip:        set a label"s title attribute. (In Microsoft Internet Explorer, the title attribute is displayed as a floating tooltip.)
      

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        lblTime.Text = DateTime.Now.ToString("T");
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Label</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblTime"
        Runat="server" />
    </div>
    </form>
</body>
</html>

Label controls are used to label the two TextBox controls.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Label Form</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblFirstName"
        Text="First Name:"
        AssociatedControlID="txtFirstName"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtFirstName"
        Runat="server" />
    <br /><br />
    <asp:Label
        id="lblLastName"
        Text="Last Name:"
        AssociatedControlID="txtLastName"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtLastName"
        Runat="server" />
    </div>
    </form>
</body>
</html>

Label font

<%@ 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>ASP.NET Server Controls - Basics</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>ASP.NET Server Controls</h1>
    <h2>Basics</h2>
     <asp:Label ID="lblTime" runat="server" OnInit="lblTime_Init"></asp:Label>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
   protected void lblTime_Init(object sender, EventArgs e)
   {
      lblTime.Font.Name = "Verdana";
      lblTime.Font.Size = 20;
      lblTime.Font.Underline = true;
      lblTime.Font.Bold = true;
      lblTime.Font.Italic = true;
      lblTime.Font.Overline = true;
      lblTime.Font.Strikeout = true;
      lblTime.Text = DateTime.Now.ToString() + ". Font Name: " + lblTime.Font.Name;
   }
}

Label hot key

<%@ 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>Label HotKeys</title>
</head>
<body>
    <form id="form1" runat="server">
    <div id="container">
    <h1>Using AccessKey for Controls</h1>
    <asp:Label ID="labName" runat="server" 
         AccessKey="N" AssociatedControlID="txtName" Text="<u>N</u>ame"></asp:Label>
    <asp:TextBox ID="txtName" runat="server"></asp:TextBox><br />
        <asp:Label ID="labMonth" runat="server" 
         AccessKey="M" AssociatedControlID="drpMonth" Text="<u>M</u>onth"></asp:Label>
    <asp:DropDownList ID="drpMonth" runat="server">
        <asp:ListItem>January</asp:ListItem>
        <asp:ListItem>February</asp:ListItem>
         <asp:ListItem>March</asp:ListItem>
    </asp:DropDownList>
    </div>
    </form>
</body>
</html>

Set Label through code (VB)

Page Language = "VB"
<%@ Page Language="VB" %>
<script runat="server">
   sub Page_Load(obj as object, e as eventargs)
      lblMessage.Text = "Welcome to ASP.NET!"
   end sub   
</script>
<html>
  <body>
    <asp:Label id="lblMessage" runat="server"/>
  </body>
</html>

Set text to Label (C#)

Page Language="C#"
<%@ Page Language="C#" %>
<script runat="server">
   void Page_Load(Object obj, EventArgs e) {
      lblMessage.Text = "Welcome to ASP.NET!";
   }
</script>
<html><body>
   <asp:Label id="lblMessage" runat="server"/>
</body></html>

Use asp:Label to display text message (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
   sub Page_Load(obj as object, e as eventargs)
      lblMessage.Text = "This is my first exercise!"
   end sub   
</script>
<html><body>
   <asp:Label id="lblMessage" runat="server"/>
</body></html>

Use of AssociatedControlID property on labels to bind a particular label to an input control

<%@ Page language="C#" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Label For</title>
</head>
<body>
    <div id="pageContent">
        <form runat="server" id="MainForm">
            <asp:Label ID="Label1" runat="server" Text="This label has no associated control"></asp:Label>
            <asp:TextBox ID="TextBox1" runat="server" />
            <br />
            <asp:Label ID="Label2" runat="server" Text="This label is associated with the textbox"
                 AssociatedControlID="TextBox2"></asp:Label>
            <asp:TextBox ID="TextBox2" runat="server" />
        </form>
    </div>
</body>
</html>

Using the Label server control to provide hot-key functionality

<%@ Page Language="C#" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Label Server Control</title>
</head>
<body>
    <form id="form1" runat="server">
            <asp:Label ID="Label1" 
                       Runat="server" 
                       AccessKey="N" 
                       AssociatedControlID="Textbox1">User<u>n</u>ame
            </asp:Label>
            <asp:Textbox ID="TextBox1" Runat="server"></asp:Textbox>
            <asp:Label ID="Label2" 
                       Runat="server" 
                       AccessKey="P" 
                       AssociatedControlID="Textbox2"><u>P</u>assword
            </asp:Label>
            <asp:Textbox ID="TextBox2" Runat="server"></asp:Textbox>
            <asp:Button ID="Button1" Runat="server" Text="Submit" />
    </form>
</body>
</html>

ASP.NET Tutorial/ASP.net Controls/Label

Содержание

Add style to asp:Label

Change asp:Label Text in page load event listener (VB.net)

Format a Label with CSS

Highlight with regular expression

Import properties of The Label control

Label controls are used to label the two TextBox controls.

Label font

Label hot key

Set Label through code (VB)

Set text to Label (C#)

Use asp:Label to display text message (VB.net)

Use of AssociatedControlID property on labels to bind a particular label to an input control

Using the Label server control to provide hot-key functionality

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