HtmlSelect.Size 属性
定义
重要
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获取或设置 HtmlSelect 控件的高度（以行为单位）。
public:
property int Size { int get(); void set(int value); };public int Size { get; set; }member this.Size : int with get, setPublic Property Size As Integer属性值
HtmlSelect 控件的高度（以行为单位）。
示例
下面的代码示例演示如何使用 Size 属性指定控件) 行 (HtmlSelect 的高度。
<%@ 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 Button_Click (Object sender, EventArgs e)
{
Label1.Text = "You selected:";
for (int i=0; i<=Select1.Items.Count - 1; i++)
{
if (Select1.Items[i].Selected)
Label1.Text += "<br /> -" + Select1.Items[i].Text;
}
Select1.Size = Convert.ToInt32(Select2.Value);
}
void Check_Changed (Object sender, EventArgs e)
{
Select1.Multiple = CheckBox1.Checked;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title> HtmlSelect Example </title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3> HtmlSelect Example </h3>
Select item(s) from the list: <br /><br />
<select id="Select1"
multiple="true"
runat="server">
<option value="1" selected="selected"> Item 1 </option>
<option value="2"> Item 2 </option>
<option value="3"> Item 3 </option>
<option value="4"> Item 4 </option>
<option value="5"> Item 5 </option>
<option value="6"> Item 6 </option>
</select>
<hr />
HtmlSelect Size: <br />
<select id="Select2"
runat="server">
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4" selected="selected"> 4 </option>
<option value="5"> 5 </option>
<option value="6"> 6 </option>
</select>
<asp:CheckBox id="CheckBox1"
Text="Enable Multiple Property"
AutoPostBack="True"
OnCheckedChanged="Check_Changed"
Checked="True"
runat="server"/>
<br /><br />
<button id="Button1"
onserverclick="Button_Click"
runat="server">
Submit
</button>
<br /><br />
<asp:Label id="Label1" runat="server"/>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Button_Click (sender As Object, e As EventArgs)
Dim i As Integer
Label1.Text = "You selected:"
For i = 0 to Select1.Items.Count - 1
If Select1.Items(i).Selected Then
Label1.Text = Label1.Text & "<br /> -" & Select1.Items(i).Text
End If
Next
Select1.Size = CInt(Select2.Value)
End Sub
Sub Check_Changed (sender As Object, e As EventArgs)
Select1.Multiple = CheckBox1.Checked
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title> HtmlSelect Example </title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3> HtmlSelect Example </h3>
Select item(s) from the list: <br /><br />
<select id="Select1"
multiple="true"
runat="server">
<option value="1"> Item 1 </option>
<option value="2"> Item 2 </option>
<option value="3"> Item 3 </option>
<option value="4" selected="selected"> Item 4 </option>
<option value="5"> Item 5 </option>
<option value="6"> Item 6 </option>
</select>
<hr />
HtmlSelect Size: <br />
<select id="Select2"
runat="server">
<option value="1" selected="selected"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
<option value="6"> 6 </option>
</select>
<asp:CheckBox id="CheckBox1"
Text="Enable Multiple Property"
AutoPostBack="True"
OnCheckedChanged="Check_Changed"
Checked="True"
runat="server"/>
<br /><br />
<button id="Button1"
onserverclick="Button_Click"
runat="server">
Submit
</button>
<br /><br />
<asp:Label id="Label1" runat="server"/>
</div>
</form>
</body>
</html>
注解
使用 Size 属性在控件) 行中指定高度 (HtmlSelect 。 如果指定的大小小于控件中的项数，则会显示滚动条，以便向上和向下移动列表。
默认情况下，控件 HtmlSelect 显示为下拉列表框。 如果通过将属性设置为 Multiple true) 或通过将属性设置为 Size 大于) 的值 1 来指定大于一行 (的高度，则控件将显示为列表框 (。