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Unit Structure

Represents a length measurement.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

[SerializableAttribute] 
public struct Unit
/** @attribute SerializableAttribute() */ 
public final class Unit extends ValueType
JScript suports the use of structures, but not the declaration of new ones.

The Unit structure represents a length measurement that can be expressed in any HTML-compatible size unit. The UnitType enumeration lists the units of measurement that can be represented. The Unit is used by properties such as BorderWidth and Height to represent the length or width of the property. For example, you can set the BorderWidth property of a Web Server control to a Unit that represents five pixels.

NoteNote

The Unit class can represent values only between -32768 and 32767.

Use the Value property to determine the length of the measurement. The unit of measurement is determined using the Type property. You can convert other data types to a Unit by using the Parse, Percentage, Pixel, and Point methods.

For a list of initial property values for an instance of Unit, see the Unit constructor.

TopicLocation
How to: Set Web Server Control Unit PropertiesBuilding ASP .NET Web Applications
How to: Set Web Server Control Unit PropertiesBuilding ASP .NET Web Applications

The following code example demonstrates how to use a Style object to change the style properties of multiple controls at once. Each time one of the Style property values changes, each control must call its ApplyStyle method. Note that not all the controls support all the properties demonstrated. If a control does not support a particular property, the appearance of the control will not change when the property value is changed.

<%@ Page language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Data" %>

<html>
    <head>
        <script runat="server">

            private Style primaryStyle = new Style();

            void Page_Load(object sender, System.EventArgs e)
            {
                if (!Page.IsPostBack)
                {
                    // Add data to the borderColorList, 
                    // backColorList, and foreColorList controls.
                    ListItemCollection colors = new ListItemCollection();
                    colors.Add(Color.Black.Name);
                    colors.Add(Color.Blue.Name);
                    colors.Add(Color.Green.Name);
                    colors.Add(Color.Orange.Name);
                    colors.Add(Color.Purple.Name);
                    colors.Add(Color.Red.Name);
                    colors.Add(Color.White.Name);
                    colors.Add(Color.Yellow.Name);
                    borderColorList.DataSource = colors;
                    borderColorList.DataBind();         
                    backColorList.DataSource = colors;
                    backColorList.DataBind();
                    foreColorList.DataSource = colors;
                    foreColorList.DataBind();

                    // Add data to the borderStyleList control.
                    ListItemCollection styles = new ListItemCollection();
                    Type styleType = typeof(BorderStyle);
                    foreach (string s in Enum.GetNames(styleType))
                    {
                        styles.Add(s);
                    }
                    borderStyleList.DataSource = styles;
                    borderStyleList.DataBind();  

                    // Add data to the borderWidthList control.
                    ListItemCollection widths = new ListItemCollection();
                    for (int i = 0; i < 11; i++)
                    {
                        widths.Add(i.ToString() + "px");
                    }
                    borderWidthList.DataSource = widths;
                    borderWidthList.DataBind();

                    // Add data to the fontNameList control.
                    ListItemCollection names = new ListItemCollection();
                    names.Add("Arial");
                    names.Add("Courier");
                    names.Add("Garamond");
                    names.Add("Time New Roman");
                    names.Add("Verdana");
                    fontNameList.DataSource = names;
                    fontNameList.DataBind();

                    // Add data to the fontSizeList control.
                    ListItemCollection fontSizes = new ListItemCollection();
                    fontSizes.Add("Small");
                    fontSizes.Add("Medium");
                    fontSizes.Add("Large");
                    fontSizes.Add("10pt");
                    fontSizes.Add("14pt");
                    fontSizes.Add("20pt");
                    fontSizeList.DataSource = fontSizes;
                    fontSizeList.DataBind();
                    
                    //Set primaryStyle as the style for each control.
                    Label1.ApplyStyle(primaryStyle);
                    ListBox1.ApplyStyle(primaryStyle);
                    Button1.ApplyStyle(primaryStyle);
                    Table1.ApplyStyle(primaryStyle);
                    TextBox1.ApplyStyle(primaryStyle);
                }
            }
            void ChangeBorderColor(object sender, System.EventArgs e)
            {
                primaryStyle.BorderColor = 
                    Color.FromName(borderColorList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }
    
            void ChangeBackColor(object sender, System.EventArgs e)
            {
                primaryStyle.BackColor = 
                    Color.FromName(backColorList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }

            void ChangeForeColor(object sender, System.EventArgs e)
            {
                primaryStyle.ForeColor = 
                    Color.FromName(foreColorList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }

            void ChangeBorderStyle(object sender, System.EventArgs e)
            {
                primaryStyle.BorderStyle = 
                    (BorderStyle)Enum.Parse(typeof(BorderStyle), 
                    borderStyleList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }

            void ChangeBorderWidth(object sender, System.EventArgs e)
            {
                primaryStyle.BorderWidth = 
                    Unit.Parse(borderWidthList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }

            void ChangeFont(object sender, System.EventArgs e)
            {
                primaryStyle.Font.Name = 
                    fontNameList.SelectedItem.Text;
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }

            void ChangeFontSize(object sender, System.EventArgs e)
            {
                primaryStyle.Font.Size = 
                    FontUnit.Parse(fontSizeList.SelectedItem.Text);
                Label1.ApplyStyle(primaryStyle);
                ListBox1.ApplyStyle(primaryStyle);
                Button1.ApplyStyle(primaryStyle);
                Table1.ApplyStyle(primaryStyle);
                TextBox1.ApplyStyle(primaryStyle);
            }
        </script>
    </head>

    <body>
        <form id="Form1" runat="server">
            <table cellPadding="6" border="0">
                <tr>
                    <td>
                        <asp:label id="Label1" 
                            Text="Border Properties Example" Runat="server">
                            <center><br>Label Styles</center>
                        </asp:label>
                    </td>
                    <td>
                        <asp:button id="Button1" runat="server" 
                            Text="Button Styles">
                        </asp:button>
                    </td>
                    <td>
                        <asp:listbox id="ListBox1" Runat="server">
                            <asp:ListItem Value="0" Text="List Item 0">
                            </asp:ListItem>
                            <asp:ListItem Value="1" Text="List Item 1">
                            </asp:ListItem>
                            <asp:ListItem Value="2" Text="List Item 2">
                            </asp:ListItem>
                        </asp:listbox>
                    </td>
                    <td>
                        <asp:textbox id="TextBox1" 
                            Text="TextBox Styles" Runat="server">
                        </asp:textbox>
                    </td>
                    <td>
                        <asp:table id="Table1" Runat="server">
                            <asp:TableRow>
                                <asp:TableCell Text="(0,0)"></asp:TableCell>
                                <asp:TableCell Text="(0,1)"></asp:TableCell>
                            </asp:TableRow>
                            <asp:TableRow>
                                <asp:TableCell Text="(1,0)"></asp:TableCell>
                                <asp:TableCell Text="(1,1)"></asp:TableCell>
                            </asp:TableRow>
                        </asp:table>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Label Runat="server" Text="Border Color:">
                        </asp:Label>
                        <asp:dropdownlist id="borderColorList" 
                            Runat="server" AutoPostBack="True" 
                            OnSelectedIndexChanged="ChangeBorderColor">
                        </asp:dropdownlist>
                        <br>
                        <asp:Label Runat="server" Text="Border Style:">
                        </asp:Label>
                        <asp:dropdownlist id="borderStyleList" 
                            Runat="server" AutoPostBack="True"
                            OnSelectedIndexChanged="ChangeBorderStyle">
                        </asp:dropdownlist>
                        <br>
                        <asp:Label Runat="server" Text="Border Width">
                        </asp:Label>
                        <asp:dropdownlist id="borderWidthList" 
                            Runat="server" AutoPostBack="True"
                            OnSelectedIndexChanged="ChangeBorderWidth">
                        </asp:dropdownlist>
                    </td>
                    <td>
                        <asp:Label Runat="server" Text="Back Color:">
                        </asp:Label>
                        <asp:dropdownlist id="backColorList" 
                            Runat="server" AutoPostBack="True"
                            OnSelectedIndexChanged="ChangeBackColor">
                        </asp:dropdownlist>
                        <br>
                        <asp:Label Runat="server" Text="Foreground Color:">
                        </asp:Label>
                        <asp:dropdownlist id="foreColorList" 
                            Runat="server" AutoPostBack="True"
                            OnSelectedIndexChanged="ChangeForeColor">
                        </asp:dropdownlist>
                    </td>
                    <td>
                        <asp:Label Runat="server" Text="Font Name:">
                        </asp:Label>
                        <asp:dropdownlist id="fontNameList" 
                            Runat="server" AutoPostBack="True"
                            OnSelectedIndexChanged="ChangeFont">
                        </asp:dropdownlist>
                        <br>
                        <asp:Label Runat="server" Text="Font Size:">
                        </asp:Label>
                        <asp:dropdownlist id="fontSizeList" 
                            Runat="server" AutoPostBack="True" 
                            OnSelectedIndexChanged="ChangeFontSize">
                        </asp:dropdownlist>
                    </td>
                </tr>
            </table>
        </form>
    </body>
</html>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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