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asp:DropDownList 的一些属性

article 2025/9/18 14:42:27

使用 BorderStyle 属性为 Web 服务器控件指定边框样式。使用一个 BorderStyle 枚举值设置此属性。下表列出了可能的值。

边框样式	说明
NotSet	不设置边框样式。
None	无边框
Dotted	虚线边框。
Dashed	点划线边框。
Solid	实线边框。
Double	双实线边框。
Groove	用于凹陷边框外观的凹槽状边框。
Ridge	用于凸起边框外观的突起边框。
Inset	用于凹陷控件外观的内嵌边框。
Outset	用于凸起控件外观的外嵌边框。

<%@ Page language="c#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
// Determine whether this is the first time the page is loaded;
// if so, load the drop-down lists with data.
if (!Page.IsPostBack)
{
// Create a ListItemCollection and add names of colors.
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);
// Bind the colors collection to the borderColorList.
borderColorList.DataSource = colors;
borderColorList.DataBind();
// Create a ListItemCollection and the add names of 
// the BorderStyle enumeration values.
ListItemCollection styles = new ListItemCollection();
foreach (string s in Enum.GetNames(typeof(BorderStyle)))
{
styles.Add(s);
}
// Bind the styles collection to the borderStyleList.
borderStyleList.DataSource = styles;
borderStyleList.DataBind();
// Create a ListItemCollection and add width values
// expressed in pixels (px).
ListItemCollection widths = new ListItemCollection();
for (int i = 0; i < 11; i++)
{
widths.Add(i.ToString() + "px");
}
// Bind the widths collection to the borderWidthList.
borderWidthList.DataSource = widths;
borderWidthList.DataBind();
}
}
// This method handles the SelectedIndexChanged event for borderColorList.
public void ChangeBorderColor(object sender, System.EventArgs e)
{
// Convert the color name string to an object of type Color, 
// and set the Color as the new border color for Label1.
Label1.BorderColor = Color.FromName(borderColorList.SelectedItem.Text);
}
// This method handles the selectedIndexChanged event for boderStyleList.
public void ChangeBorderStyle(object sender, System.EventArgs e)
{
// Convert the style name string to a BorderStyle enumeration value,
// and set the BorderStyle as the new border style for Label1.
Label1.BorderStyle = (BorderStyle)Enum.Parse(typeof(BorderStyle),
borderStyleList.SelectedItem.Text);
}
// This method handles the SelectedIndexChanged event for borderWidthList.
public void ChangeBorderWidth(object sender, System.EventArgs e)
{
// Convert the border width string to a object of type Unit,
// and set the Unit as the new border width for Label1.
Label1.BorderWidth = Unit.Parse(borderWidthList.SelectedItem.Text);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title> Border Properties Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3> Border Properties Example </h3>
<table border="0" cellpadding="6">
<tr>
<td>
<asp:Label Runat="server" BorderColor="Black" 
BorderStyle="Solid" BorderWidth="4px" ID="Label1" 
Text="Border Properties Example" Height="75" 
Width="200"><center><br />Border Properties Example
</center></asp:Label>
</td>
<td>
<asp:DropDownList Runat="server" ID="borderColorList" 
OnSelectedIndexChanged="ChangeBorderColor" AutoPostBack="True" 
EnableViewState="True"></asp:DropDownList>
<br />
<br />
<asp:DropDownList Runat="server" ID="borderStyleList" 
OnSelectedIndexChanged="ChangeBorderStyle" AutoPostBack="True" 
EnableViewState="True"></asp:DropDownList>
<br />            
<br />
<asp:DropDownList Runat="server" ID="borderWidthList" 
OnSelectedIndexChanged="ChangeBorderWidth" AutoPostBack="True"
EnableViewState="True"></asp:DropDownList>
</td>
</tr>
</table>
</form>
</body>
</html>